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Drainage Report
Drainage Report for Castlegate Subdivision Section 2, Phase 2 College Station, Texas July 2001 Developer: Greens Prairie Investors, Ltd. By Greens Prairie Associates, LLC 5010 Augusta College Station, Texas 77845 (979) 693-7830 Prepared By: TEXCON General Contractors 1 707 Graham Road College Station, Texas 77845 (979) 690-7711 REVIEWED FOR i Cnf\.~01 '""~r~F JUL 1 9 2001 COLLE:C1E: ,:_, ' .. l 1ut\J ENGINEERING ~ CERTIFICATION I, Joseph P. Schultz, Licensed Professional Engineer No. 65889, State of Texas, certify that this report for the drainage design for the Castlegate Subdivision, Section 2, Phase 2 was prepared by me in accordance with the provisions of the City of College Station Drainage Policy and Design Standards for the owners hereof. 1-{,,-0( ~~ Ginger L.ffilith,E:: REVIEWED FOR ~ cn~np1 1/\.\\1ci= JUL 1 9 2001 COLLEGi= ~; 1-.i ,,_,.,1\J ENGINEERING TABLE OF CONTENTS DRAINAGE REPORT CASTLEGATE SUBDIVISION SECTION 2, PHASE 2 CERTIFICATION .................................................................................................................................................................. 1 TABLE OF CONTENTS ........................................................................................................................................................ 2 LIST OF TABLES .................................................................................................................................................................. 3 INTRODUCTION .................................................................................................................................................................. .4 GENERAL LOCATION AND DESCRIPTION .................................................................................................................. 4 FLOOD HAZARD INFORMATION .................................................................................................................................... 4 DEVELOPMENT DRAINAGE PATTERNS ...................................................................................................................... .4 DRAINAGE DESIGN CRITERIA ........................................................................................................................................ 5 STORM WATER RUNOFF DETERMINATION ............................................................................................................... 5 DETENTION FACILITY DESIGN ...................................................................................................................................... 7 STORM SEWER DESIGN .................................................................................................................................................... 7 CONCLUSIONS ..................................................................................................................................................................... 8 APPENDIX A .......................................................................................................................................................................... 9 Storm Sewer Inlet Design Calculations APPENDIX B ........................................................................................................................................................................ 11 Storm Sewer Pipe Design Calculations EXHIBIT A ........................................................................................................................................................................... .44 Offsite Infrastructure Plan for Castlegate Subdivision EXHIBIT B ............................................................................................................................................................................ 46 Post-Development Drainage Area Map 2 LIST OFT ABLES TABLE 1 -Rainfall Intensity & Time of Concentration Calculations .............................................. 6 TABLE 2 -Post-Development Runoff Information ............................................................................ 6 3 DRAINAGE REPORT CASTLEGATE SUBDIVISION SECTION 2, PHASE 2 INTRODUCTION The purpose of this report is to provide the hydrological effects of the construction of the Castlegate Subdivision, Section 2, Phase 2, and to verify that the proposed storm drainage system meets the requirements set forth by the City of College Station Drainage Policy and Design Standards. GENERAL LOCATION AND DESCRIPTION The project is located on a 162 acre tract located west of State Highway 6 along the north side of Greens Prairie Road in College Station, Texas. This report addresses Section 2, Phase 2 of this subdivision, which consists of 27.53 acres. The site is wooded with the vegetation primarily consisting of oak trees and yaupons. The existing ground elevations range from elevation 290 to elevation 312. The general location of the project site is shown on the vicinity map in Exhibit B. FLOOD HAZARD INFORMATION The project site is located in the Spring Creek branch of the Lick Creek Drainage Basin. The site is located in a Zone X Area according to the Flood Insurance Rate Map prepared by the Federal Emergency Management Agency (FEMA) for Brazos County, Texas and incorporated areas dated July 2, 1992, panel number 48041C0205-C. Zone X Areas are determined to be outside of the 500-year floodplain. LJA Engineering & Surveying, Inc. submitted a Request for Conditional Letter of Map Revision (CLO MR) to FEMA to outline a proposed l 00-year floodplain area. This CLOMR No. 00-06-844R was approved by FEMA on 9/8/2000. The proposed floodplain area affects Section 2, Phase 2; however, no infrastructure construction is proposed within the area of this floodplain. DEVELOPMENT DRAINAGE PATTERNS The storm water runoff from the site prior to development flows in one general direction. For Section 2, Phase 2, the acreage flows toward the west-northwest boundary of the tract and into existing drainage channels and Spring Creek and ultimately flows north to the proposed regional detention facility. Refer to the Offsite Infrastructure Plan in Exhibit A for the location of this proposed detention facility. 4 DRAINAGE DESIGN CRITERIA The design parameters for the storm sewer are as follows: • The Rational Method is utilized to determine peak storm water runoff rates for the storm sewer design. • Design Storm Frequency Storm Sewer system • Runoff Coefficients Pre-development 10 and 100-year storm events Post-development (single family residential) c = 0.30 c = 0.55 • Rainfall Intensity values for Brazos County for a minimum time of concentration of l 0 minutes can be found in Table 1. Where a longer time of concentration was necessary, it is noted in the respective table, and the intensities are calculated with the higher values where required. • Time of Concentration, tc -Due to the small sizes of the drainage areas, the calculated times of concentration, tc, are less than 10 minutes. Therefore, a minimum tc of 10 minutes is used in most cases to determine the rainfall intensity values. Where a longer time of concentration was necessary, it is noted and used accordingly. Refer to Table 1 for calculations. STORM WATER RUNOFF DETERMINATION The peak runoff values were determined in accordance with the criteria presented in the previous section for the 5, 10, 25 , 50, and 100-year storm events. The runoff coefficients are based on the future development of this tract. The drainage areas for post-development are shown in Exhibit B. Post-development runoff conditions are summarized in Table 2. 5 TABLE 1 -Rainfall Intensity & Time of Concentration Calculations Rainfall Intensity Values (in/hr) Storm t = c Event 10 min Is 7.693 110 8.635 l2s 9.861 lso 11.148 1100 11.639 Brazos County: 5 vear storm 10 year storm b = 76 b = 80 d = 8.5 d = 8.5 e = 0.785 e = 0.763 I = b I (tc+d)e I = Rainfall Intensity (in/hr) tc = U(V*60) le= Time of concentration (min) L = Length (ft) V =Velocity (ft/sec) 25 year storm 50 year storm 100 year storm b = 89 b = 98 b = 96 d = 8.5 d = 8.5 d = 8.0 e = 0.754 e = 0.745 e = 0.730 (Data taken from State Department of Highways and Public Transportation Hydraulic Manual, page 2-16) TABLE 2 -Post-Development Runoff Information A c tc Os Area# 010 02s Oso 0100 (acres) (min) (cfs) (cfs) (cfs) (cfs) (cfs) 42 1.38 0.55 10 5.84 6.55 7.48 8.46 8.83 43 1.36 0.55 10 5.75 6.46 7.38 8.34 8.71 44 1.69 0.55 10 7.15 8.03 9.17 10.36 10.82 45 1.00 0.55 10 4.23 4.75 5.42 6.13 6.40 46 1.03 0.55 10 4.36 4.89 5.59 6.32 6.59 47 1 .12 0.55 10 4.74 5.32 6.07 6.87 7.17 48 0.98 0.55 10 4.15 4.65 5.32 6.01 6.27 49 1 .43 0.55 10 6.05 6.79 7.76 8.77 9.15 50 1.34 0.55 10 5.67 6.36 7.27 8.22 8.58 51 1.27 0.55 10 5.37 6.03 6.89 7.79 8.13 52 1.47 0.55 10 6.22 6.98 7.97 9.01 9.41 53 0.64 0.55 10 2.71 3.04 3.47 3.92 4.10 54 1.57 0.55 10 6.64 7.46 8.51 9.63 10.05 55 0.78 0.55 10 3.30 3.70 4.23 4.78 4.99 55A 0.23 0.55 10 0.97 1.09 1.25 1 .41 1.47 56 1 .15 0.55 10 4.87 5.46 6.24 7.05 7.36 57 0.26 0.55 10 1.10 1.23 1 .41 1.59 1.66 57A 0.85 0.55 10 3.60 4.04 4.61 5.21 5.44 58 1.04 0.55 10 4.40 4.94 5.64 6.38 6.66 59 1.32 0.55 10 5.59 6.27 7.16 8.09 8.45 6 DETENTION FACILITY DESIGN The detention facility handling the runoff from this site will be a regional facility designed by LJA Engineering & Surveying, Inc. Refer to the Offsite Infrastructure Plan in Exhibit A for the location of this proposed detention facility. The runoff from this project flows into existing drainages and then into Spring Creek. The detention facility is located adjacent to Spring Creek prior to Spring Creek entering the State Highway 6 right-of-way. STORM SEWER DESIGN The storm sewer piping for this project has been selected to be Reinforced Concrete Pipe (RCP) meeting the requirements of ASTM C-76, Class III pipe. The curb inlets and junction boxes will be cast-in-place concrete. Appendix A presents a summary of the storm sewer inlet design parameters and calculations. The inlets were designed based on a l 0-year design storm. As per College Station guidelines, the capacities of inlets in sump were reduced by l 0% to allow for clogging. Inlets were located to maintain a gutter flow depth of 5" or less, which will prevent the spread of water from reaching the crown of the road for the 10-year storm event. The runoff intercepted by the proposed storm sewer inlets was calculated using the following equations. The depth of flow in the gutter was determined by using the Straight Crown Flow equation. The flow intercepted by Inlets 207-212 & 215-223 was calculated by using the Capacity of Inlets On Grade equation. The capacities for the inlets in sumps (Inlets 213 , 214 & 225) were calculated using the Inlets in Sumps, Weir Flow equation with a maximum allowable depth of 7" (5" gutter flow plus 2" gutter depression). These equations and the resulting data are summarized in Appendix A. Appendix B presents a summary of the storm sewer pipe design parameters and calculations. All pipes are 18" in diameter or larger. For pipes with 18" and 24" diameters, the cross- sectional area is reduced by 25%, as per College Station requirements. A summary of how this was achieved is shown in Appendix B as well. The pipes for the storm sewer system were designed based on the 10-year storm event; however, all but Pipes 211 , 214, 215 & 224 will also pass the 100-year storm event without any headwater. The headwaters for these four pipes are less than the proposed minimum final grade behind the inlets; therefore, the runoff will be contained within the street right-of-way until it enters the storm sewer system. As required by College Station, the velocity of flow in the storm sewer pipe system is not lower than 2.5 feet per second, and it does not exceed 15 feet per second. As the data shows, even during low flow conditions, the velocity in the pipes will exceed 2.5 feet per second and prevent sediment build- up in the pipes. The maximum flow in the storm sewer pipe system will occur in Pipe Nos. 216 & 217. Appendix B contains a summary of the Manning pipe calculations as well as flow diagrams mapping the flows through the storm sewer system for the 10 and 100-year events. The maximum velocity for the pipe system in Section 2, Phase 2 will be 13 .5 feet per second and will occur in Pipes 212 & 213. The storm sewer system will be constructed within the right-of-way of the proposed streets or in public utility easements. The storm sewer system discharges into the existing stream channel which is located in a public drainage easement. 7 CONCLUSIONS The construction of this project will significantly increase the storm water runoff from this site. The proposed storm sewer system should adequately control the runoff and release it into existing drainages. Also, the regional detention facility should adequately reduce the peak post-development runoff to less than the pre-development runoff for the design storm event. This will prevent any impact on the properties downstream of this project. 8 APPENDIX A Storm Sewer Inlet Design Calculations 9 Castlegate Subdivision Section 2 -Phase 2 -Revised August 2001, per comments Inlet Length Calculations Inlets In Sump 1 O year storm Inlet# Length & Type Flow from A c C10 Oc•rryover QTot•I QTotal+10"' Y10·•CIU•l Area# (acres) (cfs) (cfs) from inlet# (cfs) (cfs) (ft) Section 2/Pha&e 2 225 5' Recessed 55A 0.14 0.55 0.66 0.00 0.66 0.73 0.133 ----~ 57A 0.94 0.55 4.46 0.00 4.46 4.91 0.271 213 1 O' Recessed 47 1.12 0.55 5.32 0.00 212 5.32 5.85 0.289 53 0.64 0.55 3.04 0.00 223 3.04 3.34 0.235 46 1.03 0.55 4.89 1.18 215.211.211. 6.08 6.68 0.304 214 15' Recessed 220''2 52 1.47 0.55 6.98 0.37 211 7.35 8.09 0.327 Inlets On Grade I 10 year storm Inlet# Length & Type Flow from I Y10 Opertoot Oc•pKlly QbypHa Ocept1.1red Oc.,ryover Area# I (Ill llnl (ft) (cfs) (cfs) (cfs) (cfs) from inlet# Section 2/Phase 1 ·FOR INFORMATIONAL PURPOSES ONLY (PREVIOUSLY SUBMITTED FOR REVIEW) 201 15' Recessed 38 0.364 4.37 0.66 9.85 0.93 202 1 O' Recessed 5 0.329 3.95 0.62 6.23 2.03 203 10' Recessed 39 0.380 4.56 0.66 6.57 1.07 204 15' Recessed 62 0.408 4.90 0.67 10.03 ·1.72 -205 1 O' Recessed 61 0.333 3.99 0.63 6.26 -0.70 206 15' Recessed 60 0.361 4.33 0.65 9.72 -2.59 -224 15' Recessed 40 0.380 4.56 0.67 10.10 -1.64 Section 2/Phase 2 207 15' Recessed 58 0.356 4.27 0.65 9.73 -4.79 208 15' Recessed 59 0.432 5.18 0.68 10.23 -3.96 -209 1 O' Recessed 57 0.212 2.54 0.51 5.12 -3.89 --210 1 O' Recessed 56 0.370 4.43 0.66 6.62 -1.16 -211 1 O' Recessed 54 0.415 4.98 0.71 7.09 0.37 212 1 O' Recessed 55 0.319 3.83 0.61 6.13 -2.43 --215 10' Recessed 51 0.384 4.60 0.68 6.76 -0.73 216 1 O' Recessed 48 0.348 4.18 0.64 6.41 -1.76 -217 1 O' Recessed 49 0.386 4.63 0.68 6.79 0.00 218 1 O' Recessed 50 0.377 4.52 0.67 6.70 -0.33 -219 1 O' Recessed 45 0.327 3.93 0.62 6.21 ·1.46 220 1 O' Recessed 43 0.390 4.68 0.66 6.60 -0.14 221 1 O' Recessed 44 0.398 4.78 0.69 6.91 1.11 222 1 o· Recessed 42 0.341 4.09 0.63 6.34 0.22 223 15' Recessed 41 0.401 4.81 0.69 10.41 -0.29 Transverse (Crown) slope (ft/ft)= 0.038 Straight Crown Flow (Solved to find actual depth of flow, yl: a= o.56 • (zln) • s"' • y"' <:> y = {Q / (0.56 • (zln) • s"'n'" n = Roughness Coefficient = z = Reciprocal of crown slope = S = Street/Gutter Slope (ft/ft) y = Depth of flow at inlet (ft) Capacity of Inlets on grade: Oc = 0.7 * [1/(H, • H2)) * [H,512• H,'"J Oc = Flow capacity of inlet (cfs) H1 =a+ y 0.018 26 H2 =a= gutter depression (2' Standard; 4' Recessed) y = Depth of flow in approach gutter (ft) 9.85 0.00 6.23 0.00 6.57 0.93 201 8.31 2.03 202 5.56 0.00 7.12 0.31 204, 205 8.45 0.00 4.94 0.00 206 6.27 2.00 203 1.23 0.00--207 5.46 0.00 208 7.09 0.00 210 3.70 0.00 209 6.03 0.00 4.65 0.00 217 6.79 0.00 218 6.36 0.00 4.75 0.00 6.46 1.11 221 6.91 0.00 6.34 0.00 10.12 0.00 224 (In) 1.59 3.25 3.47 2.82 3.65 3.92 Qbyp-tot•l (cfs) 0.93 2.03 2.00 0.31 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.37 0.00 0.00 0.00 0.00 0.00 0.00 0.97 1.11 0.22 0.00 L10-Req'd . L10-.ctu•I 0100 (ft) (ft) (cfs) 4.22 5 0.90 6.02 6.89 10 7.17 4.10 11.06 15 6.59 9.41 usrtg y,,_"' r "o.583' Oc•pt·toU 010-Total Y100 (cfs) (cfs) (ft) 985 10.78 0.407 6.23 8.26 0.368 6.57 8.57 0.461 10.03 10.35 0.478 5.56 5.56 0.372 7.44 7.44 0.475 8.45 8.45 0.425 4.94 4.94 0.493 8.27 8.27 0.550 1.23 1.23 0.367 5.46 5.46 0.500 7.09 7.46 0.542 3.70 3.70 0.357 6.03 6.03 0.429 4.65 4.65 0.457 6.79 6.79 0.456 6.36 6.36 0.422 4.75 4.75 0.366 6.60 7.57 0.465 6.91 8.03 0.446 6.34 6.55 0.381 10.12 10.12 0.456 100 year storm Q<::.,ryover QTotel QTot•l+10% Y100 (cfs) from inlet# (cfs) (cfs) (ft) (In) 0.00 0.90 0.99 0.636 7.63 0.00 6.02 6.62 0.00 212 7.17 7.89 0.652 7.83 3.11 223 7.20 7.92 10.86 215,211.211. 17.46 19.20 "20.22 0.892 10.70 7.59 211 17.00 18.70 100 year storm (lnl 4.89 4.42 5.54 5.73 4.47 5.69 5.10 5.91 6.60 4.40 5.99 6.51 4.29 5.15 5.48 5.47 5.06 4.39 5.58 5.35 4.57 5.47 Opertoot Oc•p•clly Obypu• Oup1ured (ft) (cfs) (cfsl (cfs) 0.70 10.50 4.03 10.50 0.66 6.61 4.52 6.61 0.70 7.01 3.30 7.01 0.71 10.71 0.49 10.71 0.67 6.65 0.84 6.65 0.69 10.35 -0.75 9.60 0.72 10.78 0.61 10.78 0.69 10.37 -3.71 6.66 0.73 10.94 -2.49 8.45 0.54 5.35 -3.69 1.66 0.71 ~ 0.30 7.07 0.76 7.59 2.46 7.59 0.65 6.50 -1.51 4.99 0.72 7.23 0.90 7.23 0.68 6.82 -0.55 6.27 0.73 ~ 1.90 7.26 0.71 7.15 1.43 7.15 0.66 6.59 -0.19 6.40 0.70 7.04 1.67 7.04 0.74 7.40 3.42 7.40 0.67 6.74 2.10 6.74 0.74 11.14 2.50 11.14 Inlets in sumps. Weir Flow: L = Q I (3 * y312) c:> y = (Q I 3L)21' L = Length of inlet opening (ft) Q =Flow at inlet (cfs) y =total depth of flow on inlet (ft) max y for inlet in sump = 7" = 0.583' Ocerryover (cfs) from inlet# 0.00 0.00 4.03 201 4.52 202 0.00 5.86 204, 205 0.00 5.11 206 7.33 203 1.40 207 4.84 208 5.14 210 0.00 209 0.00 3.33 217 1.43 218 0.00 0.00 3.42 221 0.00 0.00 0.61 224 Qbyp·lotal Ocapt·lotl Q100·Total s L.c1ua1 (cfs) (cfs) (cfsl (ft/ft) (ft) 4.03 10.50 14.53 0.0380 15 4.52 6.61 11.14 0.0380 10 7.33 7.01 14.33 0.0190 10 5.02 10.71 15.73 0.0190 15 0.84 6.65 7.49 0.0163 10 5.11 10.35 15.46 0.0190 15 0.61 10.78 11.39 0.0185 15 1.40 10.37 11.77 0.0090 15 4.84 10.94 15.78 0.0090 15 0.00_ -5.35_ 5.35 0.0090 10 5.14 7.07 12.20 0.0090 10 7.59 7.59 15.19 0.0090 10 0.00 4.99 4.99 0.0090 10 0.90 7.23 8.13 0.0090 10 2.78 6.82 9.60 0.0090 10 3.33 7.26 10.58 0.0110 10 1.43 7.15 8.58 0.0110 10 0.00 6.40 6.40 0.0130 10 5.09 7.04 12.13 0.0130 10 3.42 7.40 10.82 0.0130 10 2.10 6.74 8.83 0.0200 10 3.11 11.14 14.25 0.0200 15 APPENDIXB Storm Sewer Pipe Design Calculations 11 Castlegate Subdivision Pipe Calculations -Section 2, Phase 2 -Revised August 2001, per comments Inlet Outlet 10 year storm 100 year storm Pipe# Size Length Slope Invert Invert Elev Elev *Actual Flow Design Flow V10 %Full Travel Time, tno *Actual Flow Design Flow V100 %Full Travel Time, tnoo (in) (ft) (%) (ft) (ft) (cfs) (cfs) (fps) (sec) (min) (cfs) (cfs) (fps) (sec) (min) 206 36 51 .6 0.65 304.89 304.55 45.68 8.0 75.2 6 0.11 51 .83 8.0 85.9 207 36 159.8 0.65 304.06 303.02 45.68 8.0 75.2 20 0.33 51 .83 8.0 85.9 209 36 83.8 1.21 302.75 301 .74 58.89 10.8 71 .8 8 0.13 73.14 10.7 92.1 21 0 36 147.5 1.21 301 .69 299.91 58.89 10.8 71.8 14 0.23 73.14 10.7 92.1 212 36 107.4 1.85 299.82 297.78 70.71 13.4 70.1 8 0.13 92.47 13.2 93.5 213 36 264.3 1.85 296.61 291.59 70.71 13.4 70.1 20 0.33 92.47 13.2 93.5 208 18 29.0 2.55 304.97 304.23 4.94 7.98 8.9 50.7 3 0.05 10.37 16.75 9.8 93.2 210A 18 68.6 1.20 302.29 301.47 5.13 8.28 6.7 66.1 10 0.17 6.91 11 .16 6.9 86.7 211 24 28.9 0.50 300.96 300.82 6.36 10.27 5.1 61.1 6 0.09 12.26 19.80 7.4 100.0 214 42 28.1 0.94 291 .09 290.83 77.8 10.6 71.4 3 0.04 100.06 6.0 100.0 215 42 30.2 1.05 290.73 290.41 81 .5 11.2 70.9 3 0.04 105.05 6.6 100.0 224 18 96.4 1.10 299.95 298.89 6.36 10.27 6.4 84.7 15 0.25 7.15 11 .55 7.8 100.0 223 24 69.6 1.10 298.40 297.63 13.15 21 .24 8.0 78.9 9 0.15 14.41 23.27 7.9 88.3 222 24 100.4 1.10 297.54 296.44 13.15 21 .24 8.0 78.9 13 0.21 14.41 23.27 7.9 88.3 220 27 51 .2 0.88 296.19 295.74 23.83 7.7 73.0 7 0.11 28.46 7.7 88.1 221 18 28.2 1.25 297.29 296.94 6.03 9.74 7.0 73.7 4 0.07 7.23 11 .68 6.9 91 .3 229 18 119.1 1.40 304.47 302.80 6.91 11 .16 7.4 79.1 16 0.27 7.40 11 .95 7.4 85.6 228 18 146.3 1.40 302.72 300.67 6.91 11 .16 7.4 79.1 20 0.33 7.40 11 .95 7.4 85.6 226 27 53.2 0.50 299.94 299.67 18.26 5.8 74.0 9 0.15 20.84 5.8 84.4 227 18 28.3 1.50 301 .11 300.69 4.75 7.67 7.2 58.3 4 0.07 6.40 10.34 7.6 71 .8 231 18 28.2 1.10 302.27 301 .96 6.34 10.24 6.6 82.1 4 0.07 6.74 10.89 6.5 89.7 218 27 28.2 1.25 294.78 294.43 13.43 7.7 45.1 4 0.06 34.46 9.0 91 .5 232 24 37.2 1.75 302.11 301.46 8.45 13.65 8.8 49.5 4 0.07 10.78 17.41 9.3 57.4 230 27 67.2 0.90 300.27 299.67 24.91 7.8 75.1 9 0.14 28.66 7.8 87.5 225 36 315.2 0.85 298.92 296.24 43.17 8.9 65.0 35 0.59 49.5 9.1 71 .9 219 42 214.5 0.61 294.49 293.18 67 8.6 75.5 25 0.42 77.96 8.5 90.6 217 48 101.1 0.80 292.68 291.87 88.79 10.4 64.3 10 0.16 126.79 10.7 89.4 216 48 150.7 0.80 291 .75 290.54 88.79 10.4 64.3 14 0.24 126.79 10.7 89.4 *These values refl ect the actual flow for the 18" & 24" pipes. The design flow for these pipe sizes reflects a 25% reduction in pipe area. (Refer to attached calculation for specific information.) 6 0.11 20 0.33 8 0.13 14 0.23 8 0.14 20 0.33 3 0.05 10 0.17 4 0.07 5 0.08 5 0.08 12 0.21 9 0.15 ,_ 13 0.21 7 0.11 - 4 0.07 16 0.27 20 0.33 9 0.15 4 0.06 - -4 0.07 - 3 0.05 4 0.07 9 0.14 --- 35 0.58 25 0.42 9 0.16 14 0.23 City of College Station requirement to Reduce Cross-Sectional Area of 18" & 24" Pipes by 25% Using Mannings Equation from page 48 of the College Station Drainage Policy & Design Standards Manual: Q = 1.49/n *A* R213 * S112 Q = Flow Capacity (cfs) 18" Pipe: Pipe size (inches) = 18 Wetted Perimeter WP, (ft)= 4.71 Cross-Sectional Area A, (W) = 1.766 Reduced Area AR, (W) = 1.325 Hydraulic Radius R =A/WP, (ft)= 0.375 Reduced Hydr Radius RR= AR/Wp, (ft)= 0.281 Roughness Coefficient n = 0.014 Friction Slope of Conduit S1, (ft/ft)= 0.01 Example Calculation: Slope Flow Capacity Reduced Flow Capacity % Difference s Q Oreduced Qreduced/Q 0.005 6.91 4.28 0.619 0.006 7.57 4.69 0.619 0.007 8.18 5.06 0.619 24" Pipe: Pipe size (inches)= 24 Wetted Perimeter WP, (ft)= 6.28 Cross-Sectional Area A, (W) = 3.14 Reduced Area AR, (W) = 2.355 Hydraulic Radius R =A/WP, (ft)= 0.5 Reduced Hydr Radius RR= AR/Wp, (ft)= 0.375 Roughness Coefficient n = 0.014 Friction Slope of Conduit S1, (ft/ft) = 0.01 Example Calculation: Slope Flow Capacity Reduced Flow Capacity % Difference s Q Oreduced Oreduced/Q 0.005 14.89 9.22 0.619 0.006 16.31 10.1 0.619 0.007 17.61 10.9 0.619 Conclusion: Multiply actual Qin 18" & 24" pipes by 1.615 to reflect a 25% reduction in the cross-sectional area called for on page 47, paragraph 5 of the College Station Drainage Policy & Design Standards manual. Castlegate Subdivision Section 2, Phase 2 -Pipe Flow Diagram 010 {cfs) Inlet 221 I 6.91 J, Pipe 2291 6.91 (From Phase 1) J, Inlet 222 1 6.34 Pipe 2321 8.45 June Box 208 J, J, J, Pipe 231 I 6.34 Inlet 2231 10.12 Pipe 2281 6.91 Inlet 2191 4.75 (From Phase 1) J, J, J, Pipe 2061 45.68 Pipe 2301 24.91 Inlet 2201 6.60 f-Pipe 2271 4.75 J, J, J, June Box 201 June Box 207 Pipe 2261 18.26 J, J, Pipe 2071 45.68 Inlet 207 1 4.94 Pipe 2251 43.17 Inlet 218 1 6.36 J, J, J, J, Inlet 208 1 8.27 Pipe 2081 4.94 Pipe 2241 6.36 J, J, J, Pipe 2091 58.89 Inlet 2251 5.13 Inlet 2171 6.79 J, J, J, J, June Box 202 Pipe 210AI 5.13 Pipe 2231 13.15 J, J, J, J, Pipe 2101 58.89 Inlet 209 1 1.23 June Box 206 J, J, J, J, Inlet 2101 5.46 Pipe 211 I 6.36 lnlet215I 6.03 Pipe 2221 13.15 J, J, J, J, Pipe 2121 70.71 Pipe 221 I 6.03 Inlet 2161 4.65 J, J, J, June Box 203 June Box 205 Pipe 220J 23 .83 J, J, Pipe 2131 70.71 Pipe 2191 67.00 lnlet214I 13.43 J, J, J, Inlet 211 I 7.09 Inlet 2131 8.36 f-Pipe 2181 13.43 J, J, Pipe 2141 77.80 Pipe 2171 88.79 J, J, Inlet 2121 3.70 June Box 204 J, J, llPipe 215J 81 .50 11 llPipe 216J 88.79 II Castlegate Subdivision Section 2, Phase 2 -Pipe Flow Diagram Q100 (cfs) Inlet 221 / 7.40 J, Pipe 2291 7.40 (From Phase 1) J, Inlet 222 1 6.74 Pipe 2321 10.78 June Box 208 J, J, J, Pipe 231 I 6.74 Inlet 223 I 11 .14 Pipe 2281 7.40 lnlet219 / 6.40 (From Phase 1) J, J, J, Pipe 2061 51 .83 Pipe 2301 28.66 Inlet 220 1 7.04 ~ Pipe 227 / 6.40 J, J, J, June Box 201 June Box 207 Pipe 226/ 20.84 J, J, Pipe 2071 51 .83 Inlet 207 I 10.37 Pipe 2251 49.50 lnlet218I 7.15 J, J, J, J, Inlet 2081 10.94 ~ Pipe 208 1 10.37 Pipe 2241 7.15 J, J, J, Pipe 2091 73.14 Inlet 2251 6.91 Inlet 217/ 7.26 J, J, J, J, June Box 202 Pipe 210AI 6.91 Pipe 2231 14.41 J, J, J, J, Pipe 2101 73.14 Inlet 209 1 5.35 I June Box 206 J, J, J, J, Inlet 2101 7.07 Pipe211 I 12.26 Inlet 215 / 7.23 Pipe 2221 14.41 J, J, J, J, Pipe 2121 92.47 Pipe 221 / 7.23 Inlet 216 1 6.82 J, J, J, June Box 203 June Box 205 Pipe 220/ 28.46 J, J, Pipe 2131 92.47 Pipe 219/ 77.96 Inlet 214/ 34.46 J, J, J, Inlet 211 I 7.59 Inlet 213 / 14.37 ~ Pipe 218/ 34.46 J, J, Pipe 2141 100.06 Pipe 217 / 126.79 J, J, Inlet 2121 4.99 June Box 204 J, ,J, llPipe 2151 105.05 II l!Pipe 216 1 126.79 II Pipe 2 06 -1 0 Year Stor m Manning Pipe Calculat o r Given I nput Data: Sha p e .......................... . So l ving for .................... . Diameter ....................... . Flowr ate ....................... . Slope .......................... . Manning ' s n .................... . Computed Results: Depth .......................... . Area ................. · · · · · · · · · · · Wetted Are a .................... . Wetted Perime t er ............... . Pe rimeter ...................... . Velocity ....................... . Hydrauli c Radius ............... . Percent Full ................... . Full flow Flowr ate ............. . Full flow v eloci t y ............. . Cir cular Depth of Flow 36 .0000 in 45 .6800 cfs 0 .0065 ft/ft 0 . 0140 27.0753 in 7 .0686 ft2 5 .7030 ft2 75 .5725 in 113 .0973 in 8 .0099 fps 10.8667 in 75.2093 % 49 .9330 cfs 7.0641 fps Pipe 2 06 -100 Year Storm Manning Pipe Calculator Given Input Dat a : Shape .......................... . Solving f or .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results : Depth .......................... . Area ........................ ·. ·. Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 36 .0000 in 51.8300 cfs 0 .0065 ft/ft 0 . 0140 30.9114 in 7 .0686 ft2 6.4586 ft2 85 .3456 in 113 .0973 in 8.0249 fps 10 .8974 in 85.8649 % 49.9330 cfs 7 .0641 fps Castlegate Subdiv ision , Se ction 2, Phase 2 Co l l ege Sta t ion, Texas Pipe 207 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 36 .0000 in 45 .6800 cfs 0.0065 ft/ft 0. 0140 27.0753 in 7.0686 ft2 5.7030 ft2 75 .5725 in 113.0973 in 8.0099 fps 10.8667 in 75.2093 % 49.9330 cfs 7.0641 fps Pipe 207 -100 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ......................... · · · Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Ful 1 ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 36.0000 in 51.8300 cfs 0 .0065 ft/ft 0. 0140 30.9114 in 7.0686 ft2 6.4586 ft2 85.3456 in 113. 0973 in 8.0249 fps 10.8974 in 85.8649 % 49 .9330 cfs 7.0641 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Texas Pi pe 2 08 -10 Year Sto r m Manning Pipe Calculator Given Input Data : Shape .......................... · Solving f or .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning 's n .................... . Computed Results : Circular Depth of Flow 18 .0000 in 7 .9800 cfs 0 .0255 ft/ft 0 . 0140 Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . 9. 1305 in Area ........................... . Wetted Ar ea .................... . Wetted Per imeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow v eloc ity ............. . 1 .7671 ft2 0.8999 ft2 28.5353 in 56.5487 in 8 .8678 fps 4.5411 in 50 .7249 % 15 .5759 cfs 8 .8142 fps Pi pe 2 08 -100 Year Storm Manni ng Pipe Calculator Given Input Da ta : Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circ ular Depth of Flow 18.0000 in 16 .7500 cfs 0.0255 ft/ft 0 . 0140 16.7699 in 1 . 7671 ft2 1. 7147 ft2 47 .0269 in 56 .5487 in 9.7687 fps 5 .2504 in 93 .1659 % 15 .5759 cfs 8 .8142 fps Castlegate Subdiv i s i on , Sectio n 2 , Pha s e 2 College Station , Texas Pipe 209 -10 Year St orm Manning Pipe Calcul a tor Giv en Input Data: Shape .......................... . Solv ing for .................... . Diame ter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Result s : Depth .......................... . Ar ea .................. · · · · · · · · · · Wetted Area .................... . Wetted Perimeter ............... . Perimet er ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Cir cular De pth of Flow 3 6 .0000 in 58 .8900 cfs 0.012 1 ft/ft 0 .0140 25 .834 9 in 7 .0686 ft2 5 .42 93 ft2 72.7609 in 113 . 0973 in 10.8468 fps 10 .7450 in 71 .7635 % 68 .1276 cfs 9.6381 fps Pipe 209 -100 Year Storm Manni ng Pipe Calculator Given I nput Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 36 .0000 in 73.1400 cfs 0 .0121 ft/ft 0 . 0140 33 .1626 in 7 .0686 ft2 6.8094 ft2 92 .6086 in 113 .0973 in 10 .7410 fps 10.5882 in 92.1185 % 68 .1276 cfs . 9 .6381 fps Ca stlegate Subdivision, Secti on 2 , Phase 2 Co l l e ge Stat i o n, Texa s Pipe 210 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results : Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 36.0000 in 58 .8900 cfs 0 .0121 ft/ft 0. 0140 25.8349 in 7 .0686 ft2 5.4293 ft2 72 .7609 in 113.0973 in 10 .8468 fps 10.7450 in 71.7635 % 68.1276 cfs 9.6381 fps Pipe 210 -100 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning ' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 36.0000 in 73.1400 cfs 0.0121 ft/ft 0. 0140 33.1626 in 7.0686 ft2 6.8094 ft2 92.6086 in 113.0973 in 10.7410 fps 10.5882 in 92.1185 % 68.1276 cfs 9.6381 fps Castlegate Subdivision, Section 2, Phase 2 College Station , Texas Pipe 210A -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 18 .0000 in 8 .2800 cfs 0.0120 ft/ft 0 . 0140 11 . 9016 in 1. 7671 ft2 1.2399 ft2 34.1830 in 56.5487 in 6.6780 fps 5.2232 in 66.1198 % 10 .6850 cfs 6 .0465 fps Pipe 210A -100 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate .· ...................... . Slope .......................... . Manning' s n .................... . Computed Results : Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 18.0000 in 11. 1600 cfs 0.0120 ft/ft 0. 0140 15.5990 in 1.7671 ft2 1. 6270 ft2 43 .0891 in 56.5487 in 6.8593 fps 5.4373 in 86 .6609 % 10.6850 cfs 6 .0465 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Texas Pipe 211 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... · Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results: Depth .......................... . Area ...................... · · · · · · Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 24.0000 in 10.2700 cfs 0.0050 ft/ft 0. 0140 14 .6746 in 3.1416 ft2 2.0128 ft2 43.0936 in 75 .3982 in 5 .1022 fps 6.7260 in 61.1441 % 14 .8538 cfs 4.7281 fps Pipe 211 -100 Year Storm Culvert Calculator Entered Data: Shape .......................... . Number of Barrels .............. . Solving for .................... . Chart Number ................... . Scale Number ................... . Chart Description .............. . Scale Decsription .............. . Overtopping .................... . Flowrate ....................... . Manning' s n .................... . Roadway Elevation .............. . Inlet Elevation ................ . Outlet Elevation ............... . Diameter ....................... . Length ......................... . Entrance Loss .................. . Tail water ...................... . Computed Results: Headwater ...................... . Slope .......................... . Velocity ....................... . Circular 1 Headwater 1 1 CONCRETE PIPE CULVERT; NO BEVELED RING ENTRANCE SQUARE EDGE ENTRANCE WITH HEADWALL Off 19.8000 cfs 0.0140 304 .5000 ft 300.9600 ft 300 .8200 ft 24.0000 in 27.9000 ft 0.5000 2.2500 ft 3.7061 ft Outlet Control 0.0050 ft/ft 7.3530 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Texas Revised August 2001 , per comments Pipe 212 -10 Year Storm Mann i ng Pipe Calculator Given Input Data : Shape .......................... . Solv ing for .................... . Diameter ....................... . Fl owrate ....................... . Slope .......................... . Manni ng ' s n .................... . Computed Results: Depth .......................... . Ar ea ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Ve l ocity ....................... . Hydrauli c Radius ............... . Percent Ful l ................... . Full flow Flowrate ............. . Full flow v elocity ............. . Circular Depth of Flow 36 .0000 in 70.7100 cfs 0 .0185 ft/ft 0. 0140 25 .2474 in 7 .0686 ft2 5 .3039 ft2 71 .4673 in 113 .0973 i n 13.3479 fps 10 .6746 in 70 .1406 % 84.2418 cfs 11 .9224 fps Pi pe 212 -100 Year Storm Manning Pipe Calculator Giv en I nput Data : Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning ' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimet er ............... . Perimeter ...................... . Veloci t y ....................... . Hy drau lic Radius ............... . Percen t Full ................... . Full flow Flowrate ............. . Full f low v e l o c i t y ............. . Circular Depth of Flow 36 .0000 in 92 .4700 cfs 0 .0185 f t /ft 0 . 0140 33.6615 in 7.0686 ft2 6 .8658 ft2 94 .5190 in 113 .0973 in 13.1773 fps 10 .4737 in 93 .4910 % 84.2418 cfs 11.9224 fps Castlegat e Subdiv i s ion, Section 2 , Phase 2 College Stati on, Texas Revised August 2001, per comments Pipe 213 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning ' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 36.0000 in 70.7100 cfs 0.0185 ft/ft 0 . 0140 25.2474 in 7.0686 ft2 5.3039 ft2 71.4673 in 113.0973 in 13.3479 fps 10.6746 in 70.1406 % 84.2418 cfs 11.9224 fps Pipe 213 -100 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning ' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocit y ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow v elocity ............. . Circular Depth of Flow 36.0000 in 92.4700 cfs 0.0185 ft/ft 0. 0140 33 .6615 in 7.0686 ft2 6.8658 ft2 94 .5190 in 113.0973 in 13.1773 fps 10.4737 in 93.4910 % 84.2418 cfs 11.9224 fps Castlegate Subdivision, Section 2 , Phase 2 College Station, Texas Pipe 214 -10 Year Storm Manning Pi pe Calculator Given Input Data : Shape .......................... . Solving for .................... . Diameter ....................... . Flowrat e ....................... . Slope .......................... . Manning 's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 42.0000 in 77.8000 c f s 0 .0094 ft/ft 0 .0140 29 .9897 in 9 . 6211 ft2 7.3501 ft2 84.5528 in 131. 9469 in 10.5849 fps 12 .5178 in 71.4039 % 90.5773 cfs 9 .4144 fps Pipe 214 -100 Year Storm Culvert Calculator Entered Data: Shape .......................... . Number of Barrels .............. . Solving for .................... . Chart Number ................... . Scale Number ................... . Chart Description .............. . Scale Decsription .............. . Overtopping .................... . Flowrate ....................... . Manning' s n .................... . Roadway Elevation .............. . Inlet Elevation ................ . Outlet Elevation ............... . Diameter ....................... . Length ......................... . Entrance Loss .................. . Tail water ...................... . Computed Results: Headwater ...................... . Slope .......................... . Velocity ....................... . Circular 1 Headwater 1 1 CONCRETE PIPE CULVERT; NO BEVELED RING ENTRANCE SQUARE EDGE ENTRANCE WITH HEADWALL Off 100.0600 cfs 0. 0140 302.2000 ft 291.0900 ft 290.8300 ft 42.0000 in 28.1000 ft 0 .5000 3.5000 ft 4 .1867 ft Inlet Control 0 .0093 ft/ft 6 .0024 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Texas Pipe 215 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 42.0000 in 81.5000 c fs 0 .0105 ft/ft 0 . 0140 29 .7819 i n 9. 6211 ft2 7 .2952 ft2 84.0942 i n 131.9469 in 11.1717 fps 12.4920 in 70.9093 % 95.7304 cfs 9.9500 fps Pipe 215 -100 Year Stor m Culvert Calculator Entered Data: Shape .......................... . Number of Barrels .............. . Solving for .................... . Chart Number ................... . Scale Number ................... . Chart Description .............. . Scale Decsription .............. . Overtopping .................... . Flowrate ....................... . Manning's n .................... . Roadway Elevation .............. . Inlet Elevation ................ . Outlet Elevation ............... . Diameter ....................... . Length ......................... . Entrance Loss .................. . Tailwater ...................... . Computed Results: Headwater ...................... . Slope .......................... . Velocity ....................... . Circular 1 Headwater 1 1 CONCRETE PIPE CULVERT; NO BEVELED RING ENTRANCE SQUARE EDGE ENTRANCE WITH HEADWALL Off 105.0500 cfs 0 .0140 302 .2000 ft 290.7300 ft 290.4100 ft 42.0000 in 30.2000 ft 0.5000 3.0000 ft 3.7958 ft Inlet Control 0 .0106 ft/ft 6.5789 fps Castlegate Subdivision, Secti on 2, Phase 2 College Station, Texas Pi pe 216 -10 Year Storm Manning Pi pe Calculator Give n Input Data : Shape .......................... . Solvi ng for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Resul ts: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Per imeter ............... . Perime ter ...................... . Velocity ....................... . Hydrauli c Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 48 .0000 in 88 .7900 cfs 0 .0080 ft/ft 0. 0140 30 .8499 in 12 .5664 ft2 8 .5351 ft2 89 .2911 in 150.7964 in 10.4029 fps 13 . 7646 in 64.2705 % 119.3014 cfs 9.4937 fps Pi p e 216 -100 Year Storm Manning Pipe Calculator Gi ven Input Data : Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results : Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 48 .0000 in 126.7900 cfs 0.0080 ft/ft 0 .0140 42 .9168 in 12 .5664 ft2 11. 8550 ft2 118 . 9765 in 150 .7964 in 10.6951 fps 14 .3484 in 89.4100 % 119.3014 cfs 9.4937 fps Castlegate Subdivision, Sec t i on 2 , Phas e 2 College Station, Texas Pipe 217 -10 Ye ar Storm Manning Pi pe Calculator Given Input Data: Shape .......................... . So l v ing for .................... . Diameter ....................... . Flowr a t e ....................... . Slope .......................... . Manni ng's n .................... . Comput ed Results: Dept h .......................... . Area ........................... . Wetted Ar ea .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydr aulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 48.0000 in 88 .7900 cfs 0.0080 f t/f t 0. 0140 30 .84 99 in 12 .5664 ft2 8.5351 ft2 89. 2911 in 150 .7964 in 10.402 9 fps 13.7646 in 64 .2705 % 119 .3014 cfs 9.4937 fps Pipe 217 -100 Year Storm Manning Pi pe Calculator Gi ven Input Data: Shape .......................... . Solv ing for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Cir cul a r Depth of Flow 48.0000 in 126 .7900 cfs 0.0080 ft/ft 0 . 0140 42.9168 in 12.5664 ft2 11.8550 ft2 118 .9765 in 150.7964 in 10.6951 fps 14 .3484 in 89.4100 % 119 .3014 cfs 9.4937 fps Castlegate Subdivision, Section 2, Phase 2 College Stati on, Texas Pipe 218 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow veloci ty ............. . Circular Depth of Flow 27 .0000 in 13 . 4300 cfs 0 .0125 ft/ft 0. 0140 12.1692 in 3.9761 ft2 1 .7389 ft2 39.7457 in 84.8230 in 7.7231 fps 6.3002 in 45 .0713 % 32.1526 cfs 8.0865 fps Pipe 218 -100 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 27 .0000 in 34.4600 cfs 0.0125 ft/ft 0. 0140 24.6987 in 3.9761 ft2 3.8125 ft2 68.8250 in 84.8230 in 9.0387 fps 7.9767 in 91.4768 % 32.1526 cfs 8.0865 fps Castlegate Subdivision, Sectio n 2, Phase 2 College Station, Texas Pipe 219 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results : Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 42.0000 in 67 .0000 cfs 0 .0061 ft/ft 0 . 0140 31.6901 in 9. 6211 ft2 7.7881 ft2 88 .4051 in 131.9469 in 8.6029 fps 12 .6 857 in 75.4527 % 72.9660 cfs 7 .5839 fps Pipe 219 -100 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area .......................... ·. Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 42 .0000 in 77 .9600 cfs 0 .0061 ft/ft 0. 0140 38 .0453 in 9 . 6211 ft2 9 .1628 ft2 105.7486 in 131.9469 in 8.5083 fps 12.4771 in 90.5842 % 72.9660 cfs 7.5839 fps Castlegate Subdivision, Section 2 , Phase 2 College Station, Texas Pipe 220 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 27.0000 in 23.8300 cfs 0.0088 ft/ft 0. 0140 19 .7172 in 3 .9761 ft2 3 .1111 ft2 55.3335 in 84.8230 in 7.6596 fps 8.0964 in 73 .0265 % 26.9775 cfs 6.7850 fps Pipe 220 -100 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 27.0000 in 28.4600 cfs 0 .0088 ft/ft 0 .0140 23.7907 in 3.9761 ft2 3 .7095 ft2 65.8155 in 84.8230 in 7 .6721 fps 8 .1162 in 88 .1136 % 26.9775 cfs 6 .7850 fps Castlegate Subdivision, Section 2, Phase 2 Col lege Station, Texas Pipe 221 -1 0 Year Storm Manning Pipe Calculator Given Input Data : Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 18.0000 in 9 .7400 cfs 0.0125 ft/ft 0 . 0140 13 .2651 in 1 .7671 ft2 1 .3960 ft2 37.1611 in 56 .5487 in 6.9770 fps 5.4096 in 73.6948 % 10.9053 cfs 6.1712 fps Pipe 221 -100 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results : Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 18.0000 in 11 .6800 cfs 0 .0125 ft/ft 0. 0140 16.4265 in 1. 7671 ft2 1.6917 ft2 45 .7432 in 56 .5487 in 6.9044 fps 5.3254 in 91.2582 % 10.9053 cfs 6.1712 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Texas Pipe 222 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning ' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 24.0000 in 21.2400 cfs 0.0110 ft/ft 0 .0140 18.9375 in 3 .1416 ft2 2.6589 ft2 52 .4935 in 75.3982 in 7.9881 fps 7.2940 in 78 .9064 % 22.0318 cfs 7 .0129 fps Pipe 222 -100 Year Storm Manni ng Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 24.0000 in 23.2700 cfs 0 . 0110 ft/ft 0. 0140 21.1931 in 3 .1416 ft2 2 .9359 ft2 58 .6448 in 75.3982 in 7. 9260 fps 7.2090 in 88.3045 % 22.0318 cfs 7.0129 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Texas Pipe 223 -10 Year Storm Manni ng Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning ' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 24.0000 in 21 .2400 cfs O.OllO ft/ft 0 . 0140 18.9375 in 3.1416 ft2 2.6589 ft2 52.4935 in 75.3982 in 7.9881 fps 7.2940 in 78 .9064 % 22.0318 cfs 7.0129 fps Pipe 223 -100 Year Storm Manning Pi pe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning ' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 24.0000 in 23 .2700 cfs O.OllO ft/ft 0.0140 21.1931 in 3.1416 ft2 2.9359 ft2 58.6448 in 75.3982 in 7.9260 fps 7 .2090 in 88.3045 % 22.0318 cfs 7 .0129 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Texas Pipe 224 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... · Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning ' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 18.0000 in 10 .2700 cfs 0 .0105 ft/ft 0 . 0140 15.2426 in 1 .7671 ft2 1. 5958 ft2 42.0714 in 56.5487 in 6 .4357 fps 5.4620 in 84 .6811 % 9.9949 cfs 5.6560 fps Pipe 224 -100 Year Storm Culvert Calculator Entered Data: Shape .......................... . Number of Barrels .............. . Solving for .................... . Chart Number ................... . Scale Number ................... . Chart Description .............. . Scale Decsription .............. . Overtopping .................... . Flowrate ....................... . Manning' s n .................... . Roadway Elevation .............. . Inlet Elevation ................ . Outlet Elevation ............... . Diameter ....................... . Length ......................... . Entrance Loss .................. . Tail water ...................... . Computed Results: Headwater ...................... . Slope .......................... . Velocity ....................... . Circular 1 Headwater 1 1 CONCRETE PIPE CULVERT; NO BEVELED RING ENTRANCE SQUARE EDGE ENTRANCE WITH HEADWALL Off 11.5500 cfs 0. 0140 303.9000 ft 299.9500 ft 298.8900 ft 18.0000 in 96.4000 ft 0.5000 1 .7500 ft 4 .0610 ft Outlet Control 0 . 0110 ft/ft 7 .8432 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Texas Pipe 225 -10 Year Storm Manning Pi pe Calculator Giv en Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 36.0000 in 43.1700 cfs 0.0085 ft/ft 0.0140 23.3919 in 7 .0686 ft2 4.8618 ft2 67.5006 in 113.0973 in 8 .8794 fps 10.3718 in 64.9775 % 57.1005 cfs 8.0781 fps Pipe 225 -100 Year Storm Manning Pipe Calculator Given Input Data : Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 36.0000 in 49.5000 cfs 0.0085 ft/ft 0. 0140 25 .8940 in 7.0686 ft2 5.4426 ft2 72. 8922 in 113 .0973 in 9 .0950 fps 10.7519 in 71 .9277 % 57.1005 cfs 8.0781 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Texas Pipe 226 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results: Depth .......................... . Area ........................... · Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 27.0000 in 18.2600 cfs 0.0050 ft/ft 0. 0140 19.9871 in 3.9761 ft2 3.1558 ft2 55.9454 in 84 .8230 in 5.7862 fps 8.1228 in 74.0264 % 20.3351 cfs 5.1144 fps Pipe 226 -100 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 27 .0000 in 20.8400 cfs 0.0050 ft/ft 0 .0140 22.7862 in 3.9761 ft2 3.5800 ft2 62.8921 in 84 .8230 in 5.8213 fps 8 .1968 in 84.3932 % 20.3351 cfs 5 .1144 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Texas Pipe 227 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results : Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 18 .0000 in 7 .6700 cfs 0 .0150 ft/ft 0 . 0140 10.4879 in 1 .7671 ft2 1 .0687 ft2 31.2639 in 56 .5487 in 7 .1769 fps 4 .9224 in 58 .2661 % 11 .9462 cfs 6.7602 fps Pipe 227 -100 Year Storm Manning Pipe Calculator Given Input Data : Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 18 .0000 in 10.3400 cfs 0.0150 ft/ft 0. 0140 12.9310 in 1 .7671 ft2 1.3588 ft2 36.4105 in 56 .5487 in 7 .6094 fps 5.3741 in 71 .8388 % 11.9462 cfs 6.7602 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Tex as Pipe 228 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 18 .0000 in 11.1600 cfs 0 .0140 ft/ft 0. 0140 14.2453 in 1.7671 ft2 1.4999 ft2 39.4736 in 56.5487 in 7 .4403 fps 5.4718 in 79.1404 % 11 .5411 cfs 6 .5309 fps Pipe 228 -100 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results : Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 18.0000 in 11.9500 cfs 0 . 0140 ft/ft 0 . 0140 15.4016 in 1. 7671 ft2 1.6099 ft2 42.5182 in 56.5487 in 7.4227 fps 5.4525 in 85.5643 % 11. 5411 cfs 6 .5309 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Texas Pipe 229 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 18.0000 in 11.1600 cfs 0. 0140 ft/ft 0 . 0140 14.2453 in 1.7671 ft2 1.4999 ft2 39 .4736 in 56.5487 in 7.4403 fps 5 .4718 in 79.1404 % 11.5411 cfs 6.5309 fps Pipe 229 -100 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 18.0000 in 11.9500 cfs 0. 0140 ft/ft 0. 0140 15.4016 in 1. 7671 ft2 1. 6099 ft2 42.5182 in 56 .5487 in 7.4227 fps 5.4525 in 85.5643 % 11.5411 cfs 6 .5309 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Texas Pipe 230 -10 Year Storm Manni ng Pi pe Calculator Give n Input Da ta: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning ' s n .................... . Comput ed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 27 .0000 in 24.9100 cfs 0 .0090 ft/ft 0 . 0140 20.272 3 in 3 .9761 ft2 3 .2024 ft2 56.6002 in 84.8230 in 7 .7786 fps 8.1473 i n 75 .0827 % 27 .282 4 cfs 6 .861 6 fps Pipe 2 30 -100 Year Storm Manning Pi pe Cal culator Gi ven Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning' s n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circul ar Depth of Flow 27 .0000 in 28.6600 cfs 0.0090 ft/ft 0 .0140 23.6161 in 3 .9761 ft2 3.6881 ft2 65.2823 in 84 .8230 in 7.7709 fps 8 .1353 in 87.4670 % 27 .2824 cfs 6 .8616 fps Castlegate Subdivision, Section 2 , Phase 2 College St ation, Texas Pipe 231 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results : Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 18.0000 in 10 .2400 cfs 0 . OllO ft/ft 0 . 0140 14.7693 in 1 .7671 ft2 1.5517 ft2 40.7994 in 56 .5487 in 6 .5991 fps 5.4768 in 82 .0515 % 10 .2301 cfs 5 .7891 fps Pipe 231 -100 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 18 .0000 in 10.8900 cfs O.OllO ft/ft 0 . 0140 16.1531 in 1.7671 ft2 1. 6716 ft2 44.8104 in 56.5487 in 6.5146 fps 5 .3719 in 89.7397 % 10 .2301 cfs 5.7891 fps Castlegate Subdivision, Secti on 2, Phase 2 College Stati on, Texas Pipe 232 -10 Year Storm Manning Pipe Calculator Given Input Data: Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 24 .0000 in 13 . 6500 cfs 0.0175 ft/ft 0. 0140 11 .8754 in 3.1416 ft2 1.5500 ft2 37.4500 in 75.3982 in 8.8062 fps 5 .9601 in 49 .4810 % 27.7890 cfs 8.8455 fps Pipe 232 -100 Year Storm Manning Pipe Calculator Given Input Data : Shape .......................... . Solving for .................... . Diameter ....................... . Flowrate ....................... . Slope .......................... . Manning's n .................... . Computed Results: Depth .......................... . Area ........................... . Wetted Area .................... . Wetted Perimeter ............... . Perimeter ...................... . Velocity ....................... . Hydraulic Radius ............... . Percent Full ................... . Full flow Flowrate ............. . Full flow velocity ............. . Circular Depth of Flow 24.0000 in 17 .4100 cfs 0.0175 ft/ft 0. 0140 13.7675 in 3 .1416 ft2 1 .8643 ft2 41.2470 in 75 .3982 in 9 .3386 fps 6 .5086 in 57.3645 % 27.7890 cfs 8.8455 fps Castlegate Subdivision, Section 2, Phase 2 College Station, Texas EXHIBIT A Offsite Infrastructure Plan for Castlegate Subdivision 44