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Home My WebLink About54 Development Permit 622 Delta GammaDEVELOPMENT PERMIT PERMIT NO. 622 Delta Gamma Sorority House FOR AREAS OUTSIDE THE SPECIAL FLOOD HAZARD AREA RE: CHAPTER 13 OF THE COLLEGE STATION CITY CODE SITE LEGAL DESCRIPTION: SITE ADDRESS: Lot 4, Resubdivision of Timber Ridge Additional Third Installment 1120 University Oaks OWNER: ETA Gamma House Corporation of Delta Gamma 2803 Arroyo Court College Station, TX 77845 ( 409) 694-6959 DRAINAGE BASIN: Wolf Pen Creek TYPE OF DEVELOPMENT: This permit is valid for site development for sorority house including grading, installation of utilities, and construction of parking lots and sidewalks as shown on the approved set of plans. The Contractor shall take all necessacy precautions to prevent silt and debris from leaving the immediate construction site in accordance with the approved erosion control plan as well as the City of College Station Drainage Policy and Design Criteria. The Owner and/or Contractor shall assure that all disturbed areas are sodden and establishment of vegetation occurs prior to removal of any silt fencing or hay bales used for temporary erosion control. The Owner and/or Contractor shall also insure that any disturbed vegetation be returned to its original condition, placement and state. The Owner and/or Contractor shall be responsible for any damage to adjacent properties, city streets or infrastructure due to heavy machinery and/or equipment as well as erosion, siltation or sedimentation resulting from the permitted work. Any trees required to be protected by ordinance or as part of the landscape plan must be completely fenced before any operations of this permit can begin. In accordance with Chapter 13 of the Code of Ordinances of the City of College Station , measures shall be taken to insure that debris from construction, erosion, and sedimentation shall not be deposited in city streets, or existing drainage facilities. I hereby grant this permit for development of an area outside the special flood hazard area. All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer in the development permit application for the above named project and all of the codes and ordinances of the City of College Station that apply. l~ !// Zo I 13' u t. 2 Date Owner/ Agent Date Contractor Date • McCLURE ENGINEERING, INC.------- November 20 , 1998 Mr. Jeff Tondre City of College Station P .O . Box 9960 College Station, Texas 77842 Re : Engineer's Estimate for Public Infrastructure on Delta Gamma Sorority House Dear Jeff: As requested, we have prepared an estimate of the public infrastructure for the Delta Gamma Sorority House in College Station. The public infrastructure on this project is limited to the sidewalks along University Oaks and Rhett Butler Drive. The cost estimate is as follows . Item 1 2 Description 4" Sidewalk Sidewalk Ramps Unit S .F. S.F . Quantity 1572 640 Unit Price $2 .50 7.25 Total 3,390 .00 4,640 .00 $8 ,570 .00 If you have questions regarding this estimate or need additional information, please contact me at your convenience. 1722 Broadmoor, Suite 21 o • Bryan , Texas 77802 • (409) 776-6700 • FAX (409) 776-6699 ! J ,,:"' ~ , Figure XII Development Permit City of College Station, Texas Site Legal Description: Lot 4, Resubdivision of Timber Ridge Addition Third Installment: c/o Mr. Maxfield McKenzie Site Owner: ETA GAMMA HOUSE ffiRP. OF Address : 7026 Old Katy Rd, Suite 161 , Houston DELTA GAMMA Telephone: (713) 863-1213 TX 77024 1722 Broadmoor, Suite 210 Address: Bryan, TX 77802 Engineer: Michael McClure,P .E. ,R.P.L.S. Telephone No : --'-77.;_6:;_-_:6;,,..o_7--"0-=-0------ Address : -------------Telephone No : __________ _ Date Application Filed : --------- Application is hereby made for the following development specific waterway alterations : Sorority House construction along the Wolf Pen Creek Tributary to Carter Creek GI Application Fee GI Signed Certifications 0 Drainage and erosion control plan, with supporting Drainage Report two (2) copies each . 0 Site and Construction Plans, with supporting Drainage Report two (2) copies each. 0 Other: ------------------------------- ACKNOWLEDGMENTS : I, Maxfield McKenzie ~/owner, hereby acknowledge or affirm that : The information and conclusions contained in the above plans and supporting documents comply with the current requirements of the City of College Station, ,Texas City Code, Chapter 13 and its associated Drainage Policy and Design Standards. As a condition of approval of this permit application, I agree to construct the improvements proposed in this application according to these documents and the requirements of Chapter 13 of the College Station City Code . . ~~~ Maxfield McKenzie DELTA GAMMA SORORITY Contractor Figure Xfl Continued CERTiflCATlONS : (for proposed alterations within designated flood hazard areas .) A. I, certify that any nonresidential structure on or proposed to be on this site as part of this application is designated to prevent damage to the structure or its contents as a result of flooding from the l 00 year storm . Engineer Date B . I, certify that the finished floor elevation of the lowest floor, including any basement, of any residential structure, proposed as part of this application is at or above the base flood elevation estab lished in the latest Federal Insurance Administration Flood Hazard Study and maps, as amended . Engineer Date C. I, Michael R. McClure, P .E, certify that the alterations or development covered by this permit shall not diminish the flood-carrying capacity of the waterway adjoining or crossing this permitted site and that such .alteraLl.~~e l opment are consistent with requirements of the City of College Station City C<~~:--ql'h>nceming encroachments offloodways and of -~ •• •• -t;..'t. floodway fringes . , ,,.• •• •• u· '"I. '*: •• * ~ h "*· .* .... /J A v. ~ ·································1 ~+~~~iLL.f-!!-1, ~~~··ili~.l~.9.H'J'; .. ~~-~-~.R.Mgf h~B~;c:-·•·..._Vi__,'l ,__'1_7+--~-~---------,,~··~ 3274 0 Q /~'3$.l~ , fAi0.f.Gt S T E~~··0" ~.'ff ,, ~J •••01 1•••' t:".,,? I, \'\~~ ·fr( the proposed alterations do not raise the level of the l 00 year flood above elevation est~tfsned in the latest Federal Insurance Administration Flood Hazard Study. Engineer Date Conditions or comments as part of approval: ___________________ _ In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure that debris from construction, erosion, and sedimentation shall not be deposited in city streets, or existing drainage facilities . I hereby grant this .permit for development. AJI development shall be in acGordance with the plans and specifications submitted to and approved by the City Engineer for the above named project. AJI of the applicable codes and ordinances of the City of College Station shall apply . DATE: TO: FROM: TRANSMITTAL LETTER McCLURE ENGINEERING, INC. 1722 Broadmoor, Suite 210 Bryan, Texas 77802 (409) 776-6700 Fax: (409) 776-6699 November 17, 1998 Mrs. Shirley Volk Development Coordinator CITY OF COLLEGE STATION Michael R. McClure, P.E., R.P.L.S. PROJECT NAME: DELTA GAMMA SORORITY HOUSE COMMENTS: Attached please find the following items for the above referenced project: 1. Two (2) City Staff Red-lined sets of plans 2. Six ( 6) revised sets of civil site construction plans 3. Two (2) copies ofrevised Drainage Report 4. Fire Line Analysis The Development Permit Application has been sent to the Owner for his signature and will be submitted to you as soon as it is returned. .Dra1nage Report FOR VICINITY MAP NTS October, 1998 Prepared By: McClure Engineering, Inc. 1722 Broadmoor Drive, Suite 210 Bryan, Texas 77802 ( 409) 776-6700 Drainage Re port FOR lJtJJta Gamma Sorority HoUStJ UNIVERSITY OAKS VICINITY MAP NlS October, 1998 Prepared By. McClure Engineering. Inc. 1722 Broadmoor Drive, Suite 210 Bryan, Texas 77802 ( 409) 776-6700 CERTIFICATION I, Joel J. Mitchell, Registered Professional Engineer No. 80649, State of Texas, certify that this report for the drainage design for the DELTA G.AM:MA SORORITY HOUSE, Lot 4 of the Resubdivision of Timber Ridge Addition, Third Installment, was prepared by me in accordance with the provisions of the City of College Station Drainage Policy and Design Standards for the owners thereo£ DRAINAGE REPORT WOODCREEK SECTION 10-A AND 10-B TABLE OF CONTENTS DELTA GAMMA SORORITY HOUSE INTRODUCTION 1 GENERAL LOCATION AND DESCRIPTION 1 PRIMARY & SECONDARY DRAINAGE BASIN DESCRIPTION 2 DRAINAGE DESIGN CRITERIA 2 STORM DRAIN FACILITY DESIGN 2 DETENTION FACILITY DESIGN 2 CONCLUSION 4 TABLE OF EXHIBITS EXCERPT FROM FLOOD INSURANCE RATE MAP "A" EXISTING CONDITION DRAINAGE AREA MAP "B-1 " PROPOSED CONDITION DRAINAGE AREA MAP "B-2 " RATIONAL FORMULA DRAINAGE AREA CALCULATIONS "C-1" INLET COMPUTATIONS "C-2 " PIPE SIZE CALCULATIONS "C-3" PROPOSED DETENTION POND ROUTING "D-1" HYDROGRAPHS "D-2" STAGE-STORAGE/ST AGE DISCHARGE TABLE "D-3 " DRAINAGE REPORT 11 DELTA GAMMA SORORITY HOUSE DRAINAGE REPORT DELTA GAMMA SORORITY HOUSE INTRODUCTION: The purpose of this report is to study potential drainage effects from the proposed Delta Gamma Sorority House in College Station. Results from the analysis of existing conditions and proposed improvements are provided to show that the final design accomplishes the objectives of the City of College Station Drainage Policy and Design Standards (DPDS) by controlling runoff from this site. GENERAL LOCATION AND DESCRIPTION: The one and one-half acre site is located on a platted tract at the southwest comer of the intersection of Rhett Butler and University Oaks Drive in northeast College Station. The property is platted as Lot 4 of the Resubdivision of Timber Ridge Addition, Third Installment. Bordering the site is the Circuit City Retail Facility on the South and an undeveloped tract on the west. The site is partially cleared but contains a cluster oflarge trees. It has a gentle , rolling terrain with an average slope of 2 .0% to 2.5% to the southwest. No extension of public roadways or storm drains is anticipated for this project. This property is not located in a 100-Year Flood Haz.ard Area according to the Flood Insurance Rate Maps for Brazos County, Texas and Incorporated Areas, Map No. 48041C144 C effective July 2 , 1992 as prepared by the Federal Emergency Management Agency (See Exhibit "A"). DRAINAGE REPORT 1 DELTA GAMMA SORORITY HOUSE PRIMARY & SECONDARY DRAINAGE BASIN DESCRIPTION: The primary drainage basin for the site is Wolf Pen Creek, which is a tributary of Carters Creek. Stormwater from this site is presently collected in a swale and detention pond on the Circuit City property. Outfall from the Circuit City system flows into the S.H. 30 drainage system and on to Wolf Pen Creek. DRAINAGE DESIGN CRITERIA: The proposed drainage system is designed in accordance with the City of College Station DPDS. The design storm is a 10-year event and flow calculations for are based on the Rational Method. Pipe siz.es were determined from Manning's Equation using an "n" of 0.014 . Required storage volume for the detention pond was developed using a triangular hydrograph (base = 3 * Tc). The pre-development area used for the study is the present day condition as depicted in Exhibit "B-1 ". Exhibit ''B-2" shows the proposed development and the location of the proposed detention facilities on the site . STORM DRAIN FACILITY DESIGN: Stormwater from the proposed development will be captured in the curbs and gutters of the Delta Gamma parking lot and conveyed to the detention facility. Exhibit "C-1" provides the calculations for the drainage areas shown in Exhibit "B-2". DETENTION FACILITY DESIGN: A portion of the parking area is used for stormwater storage in order to maximiz.e available space . To accomplish this , a maximum water depth of 0.5 ft. in a 10 -year storm was chosen as a DRAINAGE REPORT 2 DELTA GAMMA SORORITY HO USE design parameter. The resulting design includes four separate control weirs that are set at the same level which allow different sections of the parking lot to function as a single detention pond. This is accomplished by placing the inlets behind landscape islands with a narrow channel leading to the inlet. The channel is open on both sides of the island, but the opening is narrow so that the control feature of the system is the opening of the curb line at the entrance to the channel. The curb openings operate as a weir and are analyzed as such. During the design storms (5, 10, 25, 50, and 100-year storm events), all weirs are equally effective because storage is shared between the outlets. This analysis is not accurate during very small rainfall events ( < I-year storm) because of variances in the depth of flow over the four weirs. Exhibits "D-1" and "D-2" show the routings and hydrographs for the various design storms. The following summary tables show the pre-development and post-development flows at the study point. Study Point 1 (Junction Box on 24" R.C.P. in Rhett Butler Dr.) Design Event Pre-Development Post-Development Water Surface Elev. Qs= 5.4 cfs 5.6 cfs 294.9 Q10 = 6.0 cfs 6 .1 cfs 294.9 Q15= 6.9 cfs 6.9 cfs 295 .0 Qso= 7.8 cfs 7.4 cfs 295 .o ___ ~ ----...... U\'1 Q100 = 8.7 cfs 8.4 cfs ~95 .0 ./ Top of Berm= 295.40, Weir Elev.= 294.50, Well:_L ertgth= 6' As required, post-development runoff rates from all design storms (5 , 25, 50 and 100-year) are less than or equal to corresponding pre-development runoff rates. The proposed design for the Delta Gamma site conveys stormwater from the parking lot DRAINAGE REPORT 3 DELTA GAMMA SORORITY HOUSE detention facility through a 12" and 15" RCP to an existing 24" storm drain in Rhett Butler Drive. This 24" storm drain carries runoff to S.H. 30 and is the only public drainage system that provides an outfall from the site. Additional detention is provided in the landscape area in from of the building. This detention is not analyzed or shown in the storm system routings (Exhibits "D-1" and ''D-2"). The extent of the engineering on these detention areas is to slightly undersize the grate inlets in the area. Exhibit "C-2" shows the inlet calculations. Note that the "area provided" shown assumes that the area is 50% clogged. CONCLUSION: For all of the design events, the post-development runoff does not exceed the pre- development runoff. The 100-year event is contained in the detention pond and released into the public storm drain system. The drainage design for this site meets the requirements as stated in the City of College Station Drainage Policy and Design Standards. DRAINAGE REPORT 4 DELTA GAMMA SORORITY HOUSE PRC>.ECT SllE ZON E X ,tt 500' EXHIB IT A Flood Insurance Rote Mop Excerp t Brazos County, Te xas and Incorporated Area s Mop Number s : 48041 C0144C Effective Dote: July 2, 1992 <t :: w 0 0 a::: w ...J ...J <t <t a.. <t LL. w 0 I-0 w a::: ~ 2 <t 2 (!) ...J <t w 2 w (.) :3 ~ <t w ...J > ~ ...J 2 <t w <t 0 w <t a::: (!) ~ u; I-0 w > I-Wz 0 2 a::: w <t 0 >w 0 I-::::> <t a::: a.. I-0 ...J NO. AC. 0.4 0.55 0.95 ft. 1 1.07 0.35 0.00 0.72 0.82 220.0 2 0.26 0.20 0.00 0.06 0.14 60.0 3 0.15 0.10 0.00 0.05 0.09 50.0 2&3 0.41 0.30 0.00 0.11 0.22 50.0 Ex 1.75 1.75 0.00 0.00 0.70 220.0 EXHIBIT C-1 Rational Formula Drainage Area Calculations Delta Gamma Sorority House :: 0 :: :: ...J LL. 0 0 0 ...J ...J 2 LL. LL. >-:3 a::: J: a::: I-u 0 w I-w I-0 a::: ...J I-(!) I-...J 0 I-u w ...J I-2 I-...J ...J w > <t ::::> w ::::> <t w iii (/) N It) 0 LL. (!) ...J (!) LL. > (.) ::::> !::::! 0 ~ 0 ft. ft. ft. tus min min In/Hr cfs In/Hr cfs 4.0 1.0 1.0 1.0 3.8 10.0 6.33 5.2 7.7 6.3 1.5 1.0 1.0 1.1 0.9 5.0 8.22 1.1 9.9 1.4 0.5 230.0 3.0 1.6 2.9 5.0 8.22 0.7 9.9 0.9 0.5 230.0 3.0 1.6 2.9 5.0 8.22 1.8 9.9 2.2 4.0 1.0 1.0 1.0 3.8 10.0 6.33 4.4 7.7 5.4 0 It) 0 .,.... It) N !: 0 !::::! 0 In/Hr cfs In/Hr cfs 8.6 7.1 9.9 8.1 11.0 1.5 12.5 1.7 11.0 1.0 12.5 1.1 11.0 2.5 12.5 2.8 8.6 6.0 9.9 6.9 ~ In/Hr 11 .1 14.1 14.1 14.1 11 .1 0 ~ 0 0 0 ,... 0 !: 0 cfs In/Hr cfs 9.2 12.5 10.3 1.9 15.8 1.2 15.8 3.2 15.8 7.8 12.5 11/16/98 dra.xls Exhibit C-1 2.2 1.4 3.5 8.8 EXHIBIT C-2 INLET COMPUTATIONS Delta Gamma Soror ity House -Cl) ~ = ~ ~ "'O -Cl) 0 ~ i.. "'O 0 Cl) "'O "> ~ z C"' 0 --; ~ Cl) i.. Cl) -< ~ ~ = 0 DESCRIPTI O N ~ ~ ~ ~ u C ur b Inlet cfs ft I A 3 .9 Std . Low Point Inlet 1.69 2 .29 1B 3.9 Std . Low Point Inlet 1.69 2 .30 2 1.5 PROPOSE D GRATE INLE T 3 1.0 PROPOSED GRATE INLE T N ote: F low values for Inlet IA and 1B are based on the JOO year routed flow as determined by the 100 year Hydrograph (Exhibit D-1 ). ft 3 3 i.. ..c: Cl) -;;.. Q. 0 Cl) ~ t' "'O i.. Cl) ~ "'O u = 0 0 ~ ft 0 0 0 0 .3 0 0.3 ~ "'O "'O Cl) Cl) i.. "'O en .... = ·> i.. C"' 0 Cl) Cl) i.. ~ ~ ~ ~ ~ ~ < Cl) Cl) i.. i.. u < < G rate Inlet cfs sq-ft sq-ft 1.4 1.08 0 .58 1.4 0 .69 0 .58 11 /11/98 dra .x ls Exhibit C-2 EXHIBIT C-3 PIPE SIZE CALCULATIONS Delta Gamma Sorority House = Cl) ·;; = ~ .2.'l ~ e <I) 0 < ;... ~ ~ "O ~ u 0 ~ z ~ --"O ~ ~ 00 <I) ~ ~ = -~ ~ = ._, ~ Cl) "O <I) « ~ .=. ~ g· ... = 0 0 <I) = 0 "O 0 C.I ~ -<~ ~ ~ ~ ~ ;:;;;i ~ # # Ac. min yr cfs cfs 1A 18 100 3.9 3.9 18 1C 100 7.7 7.7 2 3 0.1 5.0 10 1.5 1.9 3 Ex 0.2 5.6 10 2.4 3.0 Note: Flow values for Inlet IA and lB are based on the 100 year routed flow as determined by the l 00 year Hydrograph (Exhibit D-1 ). *Includes 25% Flow Increase for pipe sizes <27" dia . •• See P lan & Profile for p ipe slope used (Pipe slope >or= Friction slope) « « ~ ~ .e-c. <I) 0 ~ ~ c. 00 ;... ~ ~ = ~ ~ 0 ... 0 ~ -C.I 0 0 ... ~ ;... z ~ # cfs O/o. 1 3.9 0.41 1 7.7 1.65 1 1.9 0.32 1 3.0 0.82 = ~ ~ ~ ~ z ~ ~ ~ 00 ~ " f ps I 15 3.2 0 15 6.3 0 12 2.4 85 12 3.8 91 ~ e "O ... ~ = ~ ~ ~ @) > 8 = ;... C.I ~ ~ ~ m in min I 0.00 . 0.00 . 0.59 0.4 0 5.59 5.99 11/11/98 dra .xls Exhi bit C-3 ~ ~ ~ I EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Delta Gamma Sorority House D.A. # Pond Routing EVENT= 5 D.A. # :it c .c 0 c. + 111 c .... c ... 'C 0 g> .... 0 -:;:; + I .... ... c .... + .... 'C 111 'C + 'C c + c > M -0 ~ >. (/) (/) c all ::c: .... .= N N 0 Cl. w N Qp 6.3 2.2 Tc 10.0 5.0 inc 1.0 Time cfs cfs cfs cfs cfs ft cfs 0.0 0.0 0.63 0.00 0.00 0.00 294.5 0.0 1.0 0.6 1.90 0.00 0.63 0.38 294.6 0.4 2.0 1.3 3.17 0.23 1.90 0.84 294.6 0.9 3.0 1.9 4.44 0.90 3.40 1.25 294.7 1.3 4.0 2.5 5.71 1.92 5.34 1.71 294.7 1.8 5.0 3.2 6.98 3.49 7.63 2.07 294.7 2.2 6.0 3.8 8.25 5.43 10.46 2.52 294.8 2.0 7.0 4.4 9.51 7.66 13.67 3.01 294.8 1.8 8.0 5.1 10.78 10.38 17.17 3.40 294.8 1.5 9.0 5.7 12.05 13.48 21.16 3.84 294.9 1.3 10.0 6.3 12.37 16.87 25.53 4.33 294.9 1.1 11.0 6.0 11.73 19.83 29.24 4.71 294.9 0.9 12.0 5.7 11.10 21.74 31.56 4.91 294.9 0.7 13.0 5.4 10.47 22.78 32.84 5.03 294.9 0.4 14.0 5.1 9.83 23.13 33.25 5.06 294.9 0.2 15.0 4.8 9.20 22.88 32.96 5.04 294.9 0.0 16.0 4.4 8.56 22.16 32.08 4.96 294.9 0.0 17.0 4.1 7.93 21.05 30.73 4.84 294.9 0.0 18.0 3.8 7.29 19.61 28.98 4.68 294.9 0.0 19.0 3.5 6.66 17.94 26.91 4.48 294.9 0.0 20.0 3.2 6.03 16.15 24.60 4.23 294.9 0.0 21.0 2.9 5.39 14.26 22.17 3.96 294.9 0.0 22.0 2.5 4.76 12.30 19.65 3.67 294.8 0.0 23.0 2.2 4.12 10.29 17.06 3.38 294.8 0.0 24.0 1.9 3.49 8.24 14.42 3.09 294.8 0.0 25.0 1.6 2.85 6.29 11.73 2.72 294.8 0.0 26.0 1.3 2.22 4.52 9.14 2.31 294.8 0.0 27.0 1.0 1.59 2.88 6.74 1.93 294.7 0.0 28.0 0.6 0.95 1.38 4.46 1.54 294.7 0.0 29.0 0.3 0.32 0.42 2.33 0.95 294.6 0.0 30.0 0.0 0.00 0.00 0.74 0.45 294.6 0.0 31.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 32.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 33.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 34.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 35.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 PEAK FLOWS 6 5 294.9 2 0.00 indicates inital condition 0 w (/) ...J 0 <t Cl. I-0 0 0::: I-Cl. cfs 0.00 0.83 1.72 2.58 3.48 4.28 4.51 4.77 4.95 5.17 5.44 5.59 5.58 5.47 5.28 5.04 4.96 4.84 4.68 4.48 4.23 3.96 3.67 3.38 3.09 2.72 2.31 1.93 1.54 0.95 0.45 0.00 0.00 0.00 0.00 0.00 6 dra.xls Exhibit D-1 (!) ...J ~ <t I-I-~ 0 >< I-w cf s 0.00 0.54 1.08 1.62 2.16 2.69 3.23 3.77 4.31 4.85 5.39 5.12 4.85 4.58 4.31 4.04 3.77 3.50 3.23 2.96 2.69 2.43 2.16 1.89 1.62 1.35 1.08 0.81 0.54 0.27 0.00 0.00 0.00 0.00 0.00 0.00 5 EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Delta Gamma Sorority House D.A. # Pond Routing EVENT= 10 D.A. # 'II: c ..r::. 0 a. + I'll c -c ... 'C 0 Cl ..... 0 -:;; 0 + I ..... ... c -+ ..... 'C I'll 'C + 'C c + c > M ->. CJ) CJ) c o~ a6 J: ..... -= N N 0 a.. w N Qp 7.1 2.5 Tc 10.0 5.0 inc 1.0 Time cfs cfs cfs cfs cfs ft cfs 0.0 0.0 0.71 0.00 0.00 0.00 294.5 0.0 1.0 0.7 2.14 0.00 0.71 0.43 294.6 0.5 2.0 1.4 3.56 0.34 2.14 0.90 294.6 1.0 3.0 2.1 4.98 1.12 3.90 1.39 294.7 1.5 4.0 2.8 6.41 2.44 6.11 1.83 294.7 2.0 5.0 3.6 7.83 4.32 8.85 2.26 294.7 2.5 6.0 4.3 9.26 6.58 12.15 2.79 294.8 2.2 7.0 5.0 10.68 9.34 15.84 3.25 294.8 2.0 8.0 5.7 12.10 12.59 20.02 3.72 294.8 1.7 9.0 6.4 13.53 16.22 24.69 4.24 294.9 1.5 10.0 7.1 13.88 20.24 29.75 4.75 294.9 1.2 11.0 6.8 13.17 23.85 34.13 5.14 294.9 1.0 12.0 6.4 12.46 26.22 37.02 5.40 294.9 0.7 13.0 6.1 11.75 27.59 38.68 5.55 295.0 0.5 14.0 5.7 11.04 28.13 39.34 5.60 295.0 0.2 15.0 5.3 10.32 27.99 39.17 5.59 295.0 0.0 16.0 5.0 9.61 27.29 38.31 5.51 295.0 0.0 17.0 4.6 8.90 26.13 36.90 5.39 294.9 0.0 18.0 4.3 8.19 24.59 35.03 5.22 294.9 0.0 19.0 3.9 7.48 22.73 32.77 5.02 294.9 0.0 20.0 3.6 6.76 20.62 30.21 4.79 294.9 0.0 21.0 3.2 6.05 18.31 27.39 4.54 294.9 0.0 22.0 2.8 5.34 15.96 24.36 4.20 294.9 0.0 23.0 2.5 4.63 13.59 21.30 3.86 294.9 0.0 24.0 2.1 3.92 11.19 18.21 3.51 294.8 0.0 25.0 1.8 3.20 8.77 15.10 3.17 294.8 0.0 26.0 1.4 2.49 6.46 11.98 2.76 294.8 0.0 27.0 1.1 1.78 4.39 8.95 2.28 294.7 0.0 28.0 0.7 1.07 2.49 6.17 1.84 294.7 0.0 29.0 0.4 0.36 0.97 3.56 1.29 294.7 0.0 30.0 0.0 0.00 0.00 1.33 0.68 294.6 0.0 31.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 32.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 33.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 34.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 35.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 PEAK FLOWS 7 6 295.0 2 0.00 indicates inital condition 0 w CJ) ...J 0 <! a.. I-0 0 c:: I-a.. cfs 0.00 0.92 1.89 2.87 3.80 4.73 5.00 5.22 5.44 5.72 5.98 6.13 6.14 6.04 5.85 5.59 5.51 5.39 5.22 5.02 4.79 4.54 4.20 3.86 3.51 3.17 2.76 2.28 1.84 1.29 0.68 0.00 0.00 0.00 0.00 0.00 6 dra.xls Exhibit 0-1 (!) ...J ~ <! I-I-~ ox I-w cfs 0.00 0.60 1.21 1.81 2.42 3.02 3.63 4.23 4.84 5.44 6.05 5.75 5.44 5.14 4.84 4.54 4.23 3.93 3.63 3.33 3.02 2.72 2.42 2.12 1.81 1.51 1.21 0.91 0.60 0.30 0.00 0.00 0.00 0.00 0.00 0.00 6 EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Delta Gamma Sorority House D.A. # Pond Routing EVENT= 25 D.A. # :it c: .s:::. CJ 0. + Ill c: ... c: ... "C 0 Cl .... CJ -:;:; 0 + I .... ... c: ... + .... "C cu "'C + ~ c: + c: > M >-"' "' c: 0 ~ °" ::i: .... c: N N CJ c.. w N Qp 8.1 2.8 Tc 10.0 5.0 inc 1.0 Time cfs cfs cfs cfs cfs ft cfs 0.0 0.0 0.81 0.00 0.00 0.00 294.5 0.0 1.0 0.8 2.44 0.00 0.81 0.49 294.6 0.6 2.0 1.6 4.07 0.47 2.44 0.98 294.6 1.1 3.0 2.4 5.69 1.41 4.54 1.56 294.7 1.7 4.0 3.3 7.32 3.12 7.10 1.99 294.7 2.2 5.0 4.1 8.94 5.41 10.44 2.52 294.8 2.8 6.0 4.9 10.57 8.19 14.36 3.08 294.8 2.5 7.0 5.7 12.20 11.61 18.76 3.57 294.8 2.2 8.0 6.5 13.82 15.53 23.81 4.14 294.9 2.0 9.0 7.3 15.45 19.92 29.36 4.72 294.9 1.7 10.0 8.1 15.86 24.87 35.37 5.25 294.9 1.4 11.0 7.7 15.04 29.27 40.73 5.73 295.0 1.1 12.0 7.3 14.23 32.22 44.32 6.05 295.0 0.8 13.0 6.9 13.42 33.98 46.45 6.24 295.0 0.6 14.0 6.5 12.60 34.76 47.40 6.32 295.0 0.3 15.0 6.1 11.79 34.73 47.36 6.32 295.0 0.0 16.0 5.7 10.98 34.04 46.52 6.24 295.0 0.0 17.0 5.3 10.16 32.80 45.01 6.11 295.0 0.0 18.0 4.9 9.35 31.11 42.96 5.93 295.0 0.0 19.0 4.5 8.54 29.06 40.46 5.70 295.0 0.0 20.0 4.1 7.72 26.70 37.59 5.45 294.9 0.0 21.0 3.7 6.91 24.09 34.42 5.17 294.9 0.0 22.0 3.3 6.10 21.27 31.00 4.86 294.9 0.0 23.0 2.8 5.29 18.30 27.37 4.54 294.9 0.0 24.0 2.4 4.47 15.36 23.58 4.11 294.9 0.0 25.0 2.0 3.66 12.44 19.83 3.69 294.8 0.0 26.0 1.6 2.85 9.55 16.10 3.28 294.8 0.0 27.0 1.2 2.03 6.75 12.39 2.82 294.8 0.0 28.0 0.8 1.22 4.27 8.78 2.25 294.7 0.0 29.0 0.4 0.41 2.02 5.49 1.73 294.7 0.0 30.0 0.0 0.00 0.47 2.43 0.98 294.6 0.0 31.0 0.0 0.00 0.00 0.47 0.28 294.5 0.0 32.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 33.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 34.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 35.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 PEAK FLOWS 8 6 295.0 3 0.00 indicates inital condition 0 w "' _J 0 <t c.. I-0 0 c::: I-c.. cfs 0.00 1.05 2.11 3.25 4.23 5.32 5.61 5.82 6.10 6.40 6.65 6.85 6.89 6.80 6.60 6.32 6.24 6.11 5.93 5.70 5.45 5.17 4.86 4.54 4.11 3.69 3.28 2.82 2.25 1.73 0.98 0.28 0.00 0.00 0.00 0.00 7 dra.xls Exhibit D-1 (!) _J ~ <t I-I-!Q ox I-w cfs 0.00 0.69 1.38 2.07 2.76 3.45 4.15 4.84 5.53 6.22 6.91 6.56 6.22 5.87 5.53 5.18 4.84 4.49 4.15 3.80 3.45 3.11 2.76 2.42 2.07 1.73 1.38 1.04 0.69 0.35 0.00 0.00 0.00 0.00 0.00 0.00 7 EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Delta Gamma Sorority House D.A. # Pond Routing EVENT= 50 D.A. # 'ft c: .r:. 0 Q. + IV c: -c: ... "C 0 C> ...... 0 -:;::; 0 + I ...... ... c: -+ ...... "C IV "C + "C c: + c: > M ->. VJ VJ c: 0 .! 116 J: ...... E N N 0 a.. w N Qp 9.2 3.2 Tc 10.0 5.0 inc 1.0 'Time cfs cfs cfs cfs cfs ft cfs 0.0 0.0 0.92 0.00 0.00 0.00 294.5 0.0 1.0 0.9 2.76 0.00 0.92 0.56 294.6 0.6 2.0 1.8 4.60 0.61 2.76 1.07 294.6 1.3 3.0 2.8 6.43 1.83 5.21 1.69 294.7 1.9 4.0 3.7 8.27 3.92 8.26 2.17 294.7 2.5 5.0 4.6 10.11 6.61 12.19 2.79 294.8 3.2 6.0 5.5 11.95 10.03 16.72 3.35 294.8 2.8 7.0 6.4 13.79 14.11 21.98 3.93 294.9 2.5 8.0 7.4 15.63 18.72 27.90 4.59 294.9 2.2 9.0 8.3 17.46 24.03 34.35 5.16 294.9 1.9 10.0 9.2 17.92 29.90 41.49 5.80 295.0 1.6 11.0 8.7 17.00 35.11 47.83 6.36 295.0 1.3 12.0 8.3 16.09 38.75 52.12 6.68 295.0 0.9 13.0 7.8 15.17 41.06 54.84 6.89 295.0 0.6 14.0 7.4 14.25 42.24 56.22 6.99 295.0 0.3 15.0 6.9 13.33 42.45 56.48 7.01 295.0 0.0 16.0 6.4 12.41 41.86 55.78 6.96 295.0 0.0 17.0 6.0 11.49 40.58 54.27 6.85 295.0 0.0 18.0 5.5 10.57 38.71 52.07 6.68 295.0 0.0 19.0 5.1 9.65 36.34 49.28 6.47 295.0 0.0 20.0 4.6 8.73 33.60 45.99 6.19 295.0 0.0 21.0 4.1 7.81 30.60 42.34 5.87 295.0 0.0 22.0 3.7 6.89 27.37 38.41 5.52 295.0 0.0 23.0 3.2 5.97 23.96 34.26 5.15 294.9 0.0 24.0 2.8 5.06 20.40 29.93 4.77 294.9 0.0 25.0 2.3 4.14 16.81 25.45 4.32 294.9 0.0 26.0 1.8 3.22 13.31 20.94 3.82 294.9 0.0 27.0 1.4 2.30 9.88 16.52 3.32 294.8 0.0 28.0 0.9 1.38 6.60 12.17 2.79 294.8 0.0 29.0 0.5 0.46 3.72 7.97 2.13 294.7 0.0 30.0 0.0 0.00 1.25 4.18 1.47 294.7 0.0 31.0 0.0 0.00 0.00 1.25 0.65 294.6 0.0 32.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 33.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 34.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 35.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 PEAK FLOWS 9 7 295.0 3 0.00 indicates inital condition c w VJ ...J 0 <( a.. I-0 0 0:: I-a.. cfs 0.00 1.19 2.34 3.59 4.70 5.96 6.19 6.47 6.80 7.06 7.38 7.62 7.63 7.52 7.31 7.01 6.96 6.85 6.68 6.47 6.19 5.87 5.52 5.15 4.77 4.32 3.82 3.32 2.79 2.13 1.47 0.65 0.00 0.00 0.00 0.00 8 dra.xls Exhibit D-1 (!) ...J ~ <( I-I-~ ox I-w cf s 0.00 0.78 1.56 2.34 3.12 3.90 4.69 5.47 6.25 7.03 7.81 7.42 7.03 6.64 6.25 5.86 5.47 5.08 4.69 4.30 3.90 3.51 3.12 2.73 2.34 1.95 1.56 1.17 0.78 0.39 0.00 0.00 0.00 0.00 0.00 0.00 8 EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Delta Gamma Sorority House D.A. # Pond Routing EVENT= 100 D.A. # 'It c: ..c: CJ a. + cu c: -c: ... CJ :E 0 Cl ...... :;::; 0 + I ...... "'C cu ... c: -+ ...... "'C + :E c: + c: > M >. (f) (f) c: o~ o1' :I: ...... .E N N CJ c.. w N Qp 10.3 3.5 Tc 10.0 5.0 inc 1.0 Time cfs cfs cfs cfs cfs ft cfs 0.0 0.0 1.03 0.00 0.00 0.00 294.5 0.0 1.0 1.0 3.10 0.00 1.03 0.59 294.6 0.7 2.0 2.1 5.16 0.77 3.10 1.17 294.7 1.4 3.0 3.1 7.23 2.32 5.93 1.80 294.7 2.1 4.0 4.1 9.30 4.80 9.55 2.38 294.8 2.8 5.0 5.2 11.36 7.99 14.10 3.05 294.8 3.5 6.0 6.2 13.43 12.07 19.35 3.64 294.8 3.2 7.0 7.2 15.49 16.84 25.50 4.33 294.9 2.8 8.0 8.3 17.56 22.37 32.34 4.98 294.9 2.5 9.0 9.3 19.62 28.62 39.93 5.66 295.0 2.1 10.0 10.3 20.14 35.46 48.24 6.39 295.0 1.8 11.0 9.8 19.11 41.71 55.60 6.95 295.0 1.4 12.0 9.3 18.07 46.13 60.82 7.34 295.0 1.1 13.0 8.8 17.04 49.01 64.21 7.60 295.1 0.7 14.0 8.3 16.01 50.58 66.05 7.74 295.1 0.4 15.0 7.7 14.98 51.03 66.59 7.78 295.1 0.0 16.0 7.2 13.94 50.54 66.01 7.73 295.1 0.0 17.0 6.7 12.91 49.24 64.48 7.62 295.1 0.0 18.0 6.2 11.88 47.27 62.15 7.44 295.1 0.0 19.0 5.7 10.84 44.71 59.14 7.22 295.0 0.0 20.0 5.2 9.81 41.67 55.56 6.94 295.0 0.0 21.0 4.6 8.78 38.21 51.48 6.64 295.0 0.0 22.0 4.1 7.75 34.42 46.99 6.28 295.0 0.0 23.0 3.6 6.71 30.46 42.17 5.86 295.0 0.0 24.0 3.1 5.68 26.35 37.17 5.41 294.9 0.0 25.0 2.6 4.65 22.12 32.03 4.95 294.9 0.0 26.0 2.1 3.61 17.83 26.77 4.47 294.9 0.0 27.0 1.5 2.58 13.70 21.45 3.87 294.9 0.0 28.0 1.0 1.55 9.69 16.28 3.30 294.8 0.0 29.0 0.5 0.52 5.95 11.24 2.64 294.8 0.0 30.0 0.0 0.00 2.69 6.47 1.89 294.7 0.0 31.0 0.0 0.00 0.58 2.69 1.05 294.6 0.0 32.0 0.0 0.00 0.00 0.58 0.35 294.6 0.0 33.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 34.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 35.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 PEAK FLOWS 10 8 295.1 4 0.00 indicates inital condition 0 w (f) ..J 0 <( c.. I-0 0 0:: I-c.. cfs 0.00 1.30 2.58 3.93 5.21 6.60 6.83 7.16 7.46 7.78 8.16 8.36 8.40 8.31 8.09 7.78 7.73 7.62 7.44 7.22 6.94 6.64 6.28 5.86 5.41 4.95 4.47 3.87 3.30 2.64 1.89 1.05 0.35 0.00 0.00 0.00 8 dra.xls Exhibit 0-1 (!) ..J ~ <( I-I-~ ox I-w cfs 0.00 0.88 1.76 2.63 3.51 4.39 5.27 6.14 7.02 7.90 8.78 8.34 7.90 7.46 7.02 6.58 6.14 5.70 5.27 4.83 4.39 3.95 3.51 3.07 2.63 2.19 1.76 1.32 0.88 0.44 0.00 0.00 0.00 0.00 0.00 0.00 9 ~ .!:!. a Delta Gamma Sorority House 5 Year Event Hydrograph 6 .00 5 .00 4 .00 3.00 2 .00 1.00 o.oo~~~~-+~~~~+-~~~-+~~~~+-~~~-+~~~~~""-~~-+~~~---1 0 .00 5 .00 10.00 15.00 20.00 Time(min.) 25.00 30.00 35.00 40.00 --1 --Qn+1 3S2 --TOTAL PROPOSED - - -TOTAL EXISTING 10/5/98 Exhibit D-2 Delta Gamma Sorority House 10 Year Event Hydrograph 7.00 6 .00 5.00 ~ ~ 4 .00 a 3.00 2.00 1.00 0 .001'-~~~--t-~~~~-t-~~~-i-~~~~+-~~~-+~~~---'~ ........ ~~-+~~~---! 0.00 5.00 10.00 15.00 20 .00 Tlme(mln.) 25 .00 30.00 35.00 40.00 --1 --Qn+1 3&2 --TOTAL PROPOSED ---TOT AL EXISTING 10/5/98 Exhibit D-2 ~ a Delta Gamma Sorority House 25 Year Event Hydrograph 7.00 6 .00 5.00 4 .00 3 .00 2.00 1.00 0 .00 ---~~~---~~~~....-~~~-1-~~~~+-~~~-+~~~~"t--~~~-+~~~---"I 0.00 5 .00 10.00 15.00 20 .00 Tlme(mln.) 25 .00 30.00 35 .00 40.00 --1 --Qn+1 3 az --TOTAL PROPOSED - - -TOTAL EXISTING 10/5/98 Exhibit D-2 10.00 9.00 8 .00 7 .00 6 .00 !" .!:!.. 5 .00 G 4 .00 3.00 2 .00 1.00 0 .00 0.00 5 .00 10.00 15.00 Delta Gamma Sorority House 50 Year Event Hydrograph 20.00 Tlme(mln.) 25.00 30.00 35.00 40.00 --Qn+1 3S2 --TOTAL PROPOSED - - -TOTAL EXISTING 10/5/98 Exhibit D-2 Delta Gamma Sorority House 100 Year Event Hydrograph 10.00 8.00 i -6 .00 a 4.00 2 .00 o .oo---~~~--~~~---~~~~--~~~-+-~~~-+~~~__.~~-'"'-~-+-~~~-4 0 .00 5.00 10.00 15.00 20.00 Tlme(mln.) 25 .00 30 .00 35.00 40.00 --1 --Qn+1 3 8 2 --TOTAL PROPOSED - - -TOTAL EXISTING 10/5/98 Exhibit D-2 Pond 1 EXHIBIT 0-3 STAGE-STORAGE/ST AGE-DISCHARGE TABLE Delta Gamma Sorority House Elevation Area Area Inc. Volm. Volume Outlet 1 Outlet 2 Total (ft.) (sf.) (acres) (ac.-ft.) (ac.-ft.) Invert Elev. (ft.) 294.5 295 (cfs) Oriface Dia. (in.) or Weir Length (ft.) 6 0 Flow (cfs) Flow (cfs) 294.5 0 0.000 0.000 0.000 0.00 0.00 0.00 294.6 334.4 0.008 0.000 0.000 0.57 0.00 0.57 294.7 1424.1 0.033 0.002 0.002 1.61 0.00 1.61 294.8 2987.7 0.069 0.005 0.007 2.96 0.00 2.96 294.9 4686.3 0.108 0.009 0.016 4.55 0.00 4.55 295 6500.2 0.149 0.013 0.029 6.36 0.00 6.36 295.1 8200 0.188 0.017 0.045 v' 8.37 0.00 8.37 295.2 10000 0.230 0.021 0.066 10.54 0.00 10.54 295.3 10000 0.230 0.023 0.089 12.88 0.00 12.88 295.4 10000 0.230 0.023 0.112 15.37 0.00 15.37 Page 1 Delta Gamma Sorority House Stage-Discharge Curve 0 .000.+-~~~___.-====-~~-+-~~~~f--~~~-1-~~~~+-~~~-+~~~~-+-~~~---1~~~~-+-~~~~ 294 .4 294.5 294.6 294.7 294.8 294.9 Elevation (msl) 295.0 295.1 295.2 295 .3 295 .4 Exh ibit D-3 0 .090 0 .080 0 .070 0 .060 l 8, 0 .050 t! ~ 0 .040 0 .030 0 .020 0 .010 Delta Gamma Sorority House Stage-Storage Curve 0 .0001-~~~--~~~---==:::::::::=:::::_~~~-1-~~~--1-~~~~-l--~~~-4-~~~-4-~~~~.__~~__j 294.4 294 .5 294 .6 294 .7 294 .8 294 .9 Elevation (msl) 295 295 .1 295 .2 295 .3 295 .4 Exh i bit D-3 ~ • McCLURE ENGINEERING, INC.--------... November 16 , 1998 Ms . Veronica Morgan, P .E. Department of Development Services City of College Station P.O . Box 9960 College Station, Texas 77842 Re : Delta Gamma Sorority House -Fire Line Anal y sis Dear Veronica : In response to one of the comments on the site plan for the proposed Delta Gamma Sorority House in College Station, we have prepared an analysis of the 6" line that supplies water to the fire sprinkler system in the building. That analysis is summarized on the following page. Results show that the required residual pressure at the city main needs to be at least 20 .6 psi in order to meet the fire demands of the sprinkler system with a 6" supply line . The measured residual pressure on that line was 78 psi . From these results we conclude that ample water pressure is available at this location to serve the facility . If you have questions regarding the analysis we performed, please contact me at your convemence. Thank you . Sincerely, attachments REVIEWED FOR COMPLIANCE NOV 1 81998 COLLt:\.l~ 6•h•1uN ENG\NEERING :tif 1722 Broadmoor , Suite 210 • Bryan, Texas 77802 • (409) 776-6700 • FAX (409) 776-6699 Delta Gamma Sorority House Analysis of 6" Fire Line November 16 , 1998 Required fire flow to the sprinkler system Required domestic flow Pipe velocity during fire flow Length of pipe from the city main Hazen-Williams coefficient for PVC Summary ofHeadlosses Headloss from fire flow Headloss from domestic flow Required minimum residual pressure Pressure required at the connection point 300 gpm 70gpm 3.4 fps 200 feet 150 0 .540 psi 0 .036 20 .000 20 .576 psi Crews from the Public Utilities Division of the City of College Station took flow tests and pressure measurements from two nearby fire hydrants . Their reports are attached . Of the two flow tests, the lowest residual pressure during full flow was 78 psi . This indicates that the 6" line shown on the plans to serve the sprinkler system in the building is more than adequate to provide the necessary volume and pressure. j 11:09 '0'409 764 3452 COLL STA PUB UTL l4J 002 .. D-37 Flow Test Report Date } f ~-JS -C/ 8 Time _/_Q_: J_O __ 6};A · P .M. Test made by : --r8AcAnowsk~ Location : Oak Purpose of test : flow Tes-t Representative : Witness : Flow hydrant number. U-3 7 Nozzle size : d , SO ~--=.;,.__;;;~-- Pilot reading : lo G.P.M.: l 095 Static hydrant number : D-3 ~ Static : 90 P.S.I. Residual : 60 P.S .I. \. Fi.,, Flov ,,.~ 'A Zt>OD"'::i.P'"' p...-:reM. /1,.'4 ~-· · +>/.y .s~ ~ ~ ( 'laps/ d /ars~ l~o/'ir .·· d,P( J 11: 09 '0'40 9 7 64 3452 COLL STA PUB UT L 1410 03 • D-38 Flow Test Report Date 11-· I 3-C1 f6 Time _;._J _o_: ......:.o_o __ ~<Ail>~· -p .M . Test made by : Location : i I I D H A f d wood Purpose of test : Representative : Witness : Flow hydrant number. D -3 <Z) Nozzle siz.e_::............;d::.:::;.:...' ..;;:.'S:;._0:;__ __ Pitot reading: --"0_]_,_. ____ G.P.M.: 1060 Static hydrant number : D _. 3 / Static: 8 f.o P.S.I. Residual : 7 8 P .S.I. --------~----~------------~1 I I I I I : I I I i I . I ' . I .. I Dr·ainage _fLeport FOR ~1C/NlT'/' MAP NTS October, 1998 Prepared By: McClure Engineering, Inc. 1722 Brnad:-noor Drive, Suite 210 Bryon, Texas 77802 ( 409) 776--6700 '------·--------· I I Dra1nage Re port FOR VICINITY MA NTS October, 1998 Prepared By: McClure Engineering. Inc. 1722 Broadmoor Drive, Suite 210 Bryan, Texas 77802 ( 409) 776-6700 CERTIFICATION I , Joel J . Mitchell, Registered Professional Engineer No . 80649, State of Texas, certify that this report for the drainage design for the DELTA GAMMA SORORITY HOUSE, Lot 4 of the Resubdivision of Timber Ridge Addition, Third Installment , was prepared by me in accordance with the provisions of the City of College Station Drainage Policy and Design Standards for the owners thereof. I DRAINAGE REPORT WOODCREEK SECTION 10-A AND 10-B TABLE OF CONTENTS DELTA GAMMA SORORITY HOUSE INTRODUCTION 1 GENERAL LOCATION AND DESCRIPTION 1 PRIMARY & SECONDARY DRAINAGE BASIN DESCRIPTION 2 DRAINAGE DESIGN CRITERIA 2 STORM DRAIN FACILITY DESIGN 2 DETENTION FACILITY DESIGN 2 CONCLUSION 4 TABLE OF EXHIBITS EXCERPT FROM FLOOD INSURANCE RATE MAP "A" EXISTING CONDITION DRAINAGE AREA MAP ''B-1" PROPOSED CONDITION DRAINAGE AREA MAP "B-2" RATIONAL FORMULA DRAINAGE AREA CALCULATIONS "C-1" INLET COMPUTATIONS "C-2" PIPE SIZE CALCULATIONS "C-3" PROPOSED DETENTION POND ROUTING "D-1" HYDROGRAPHS "D-2" STAGE-STORAGE/STAGE DISCHARGE TABLE "D-3" DRAINAGE REPORT DELTA GAMMA SORORITY HOUSE 11 I DRAINAGE REPORT DELTA GAMMA SORORITY HOUSE INTRODUCTION: The purpose of this report is to study potential drainage effects from the proposed Delta Gamma Sorority House in College Station. Results from the analysis of existing conditions and proposed improvements are provided to show that the final design accomplishes the objectives of the City of College Station Drainage Policy and Design Standards (DPDS) by controlling runoff from this site . GENERAL LOCATION AND DESCRIPTION: The one and one-half acre site is located on a platted tract at the southwest comer of the intersection of Rhett Butler and University Oaks Drive in northeast College Station. The property is platted as Lot 4 of the Resubdivision of Timber Ridge Addition, Third Installment. Bordering the site is the Circuit City Retail Facility on the South and an undeveloped tract on the west. The site is partially cleared but contains a cluster of large trees. It has a gentle , rolling terrain with an average slope of 2 .0% to 2.5% to the southwest. No extension of public roadways or storm drains is anticipated for this project. This property is not located in a 100-Year Flood Hazard Area according to the Flood Insurance Rate Maps for Brazos County, Texas and Incorporated Areas, Map No . 48041C144 C I effective July 2, 1992 as prepared by the Federal Emergency Management Agency (See Exhibit "A"). DRAINAGE REPORT DELTA GAMMA SORORITY HOUSE PRIMARY & SECONDARY DRAINAGE BASIN DESCRIPTION: The primary drainage basin for the site is Wolf Pen Creek, which is a tributary of Carters Creek. Stormwater from this site is presently collected in a swale and detention pond on the Circuit City property. Outfall from the Circuit City system flows into the S.H. 30 drainage system and on to Wolf Pen Creek. DRAINAGE DESIGN CRITERIA: The proposed drainage system is designed in accordance with the City of College Station DPDS . The design storm is a 10-year event and flow calculations for are based on the Rational Method. Pipe siz.es were determined from Manning 's Equation using an "n" of 0.014 . Required storage volume for the detention pond was developed using a triangular hydro graph (base = 3 * Tc). The pre-development area used for the study is the present day condition as depicted in Exhibit "B-1 ". Exhibit "B-2" shows the proposed development and the location of the proposed detention facilities on the site. STORM DRAIN FACILITY DESIGN: Stormwater from the proposed development will be captured in the curbs and gutters of the Delta Gamma parking lot and conveyed to the detention facility. Exhibit "C-1" provides the calculations for the drainage areas shown in Exhibit "B-2". DETENTION FACILITY DESIGN: A portion of the parking area is used for stormwater storage in order to maximize available space . T o accomplish this , a maximum water depth of 0.5 ft. in a 10-year storm was chosen as a DRAINAGE REPORT 2 DELTA GAMMA SORORITY HOUSE - trol weirs that are set at the same design parameter. The resulting design includes four separate con level which allow different sections of the parking lot to function as a single detention pond. This is accomplished by placing the inlets behind landscape islands with a narr ow channel leading to the inlet. ow so that the control feature The channel is open on both sides of the island, but the opening is narr of the system is the opening of the curb line at the entrance to the chann el. The curb openings operate as a weir and are analyzed as such. During the design storms ( 5 , 10, 25, 50, and 100-year storm events), all weirs are equally effective because storage is shared be tween the outlets. This analysis is not accurate during very small rainfall events ( < 1-year storm) because of variances in the depth of flow over the four weirs. Exhibits "D-1" and "D-2" show the routings and hydrographs for the various design storms. The following summary tables show the pre-development an d post-development flows at the study point. Study Point 1 (Junction Box on 24" R.C.P. in Rhett Butler Dr.) Design Event Pre-Development Post-Develop ment Water Surface Elev. Qs= 5.4 cfs 5.6 cfs 294.9 Q10= 6.0 cfs 6.1 cfs 294.9 Q15= 6.9 cfs 6.9 cfs 295.0 Qso= 7.8 cfs 7.4 cfs 295.0 Q100= 8.7 cfs 8.4 cfs 295.0 Top of Berm= 295.40, Weir Elev.= 294.50, Weir Length= 6' storms (5, 25, 50 and 100-year) tes. As required, post-development runoff rates from all design I are less than or equal to corresponding pre-development runoff ra The proposed design for the Delta Gamma site conveys stormwater from the parking lot DRAINAGE REPORT 3 DELTA GAMMA SORORITY HOUSE detention facility through a 12" and 15" RCP to an existing 24" storm drain in Rhett Butler Drive. This 24" storm drain carries runoff to S.H. 30 and is the only public drainage system that provides an outfall from the site. Additional detention is provided in the landscape area in from of the building. This detention is not analyzed or shown in the storm system routings (Exhibits "D-1" and "D-2"). The extent of the engineering on these detention areas is to slightly undersize the grate inlets in the area. Exhibit "C-2" shows the inlet calculations. Note that the "area provided" shown assumes that the area is 50% clogged. CONCLUSION: For all of the design events, the post-development runoff does not exceed the pre- development runoff. The 100-year event is contained in the detention pond and released into the public storm drain system. The drainage design for this site meets the requirements as stated in the City of College Station Drainage Policy and Design Standards. DRAINAGE REPORT 4 DELTA GAMMA SORORITY HOUS E PRO..ECT SllE ZON E X ,.. 500' EXHIBIT A Flood Insurance Rote Mop Excerpt Brazos County, Texas and Incorporated Areas Mop Numbers: 48041C0144C Effective Dote: July 2-, 19 9 2 e 0 < "' E-c u Q z r-"l -00 g ~ E-c ~ = r-"l bl) g ·-0 0 "" v ~ E-c E-c E-c ~ # # Ac. min yr 1 Ex 0 .6 5.0 10 2 3 0.1 5.0 10 3 Ex 0.2 5 .6 10 *Includes 25% Flo.v Increase for pipe sizes <27' dia . EXHIBIT C-3 PIPE SIZE CALCULATIONS Delta Gamma Sorority House = Cf) ·-= « ~ bl) « ~ ·-~ ~ "" c. c. as ~ ~ ·-e ~ ~ -.... "O c. "' 00 "" ·-= ~ ~ ~ = .... --~ Q "" « ·-"O it: .:, it: Q ~ -v OS Q "O Q e Q ... =--"' ;::> ~ < ii; z ~ ~ cfs cfs # cfs •;. 9 .1 11 .3 1 6 .0 0.99 1.5 1.9 1 1.9 0.32 2.4 3.0 1 3.0 0.82 ** See Plan & Profile for pipe slope used (Pipe slope >or= Friction slope) ~ e iS ·-E-c C,!) -~ r-"l ~ z .... t:3 ~ ~ OS "' 00 E-c " !fps I min 15 4 .9 116 0.40 12 2.4 85 0.59 12 3.8 91 0 .40 "O = ~ r-"l @ 9 v ~ E-c min I 5 .40 5.59 5.99 10/5198 dra.xls Exhibit C-3 E-c @ ~ • EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Delta Gamma Sorority House D.A.# Pond Routing EVENT= 5 D.A. # 'It: c .&: a Q. i; Cll c c ... a 0 ~ .... -"O i + ..!. .... .... ... c "O + + c > "O + -c c 0 .!! >. t/) t/) ::J: .... c N N a Q. w I") Qp 6.3 2.3 Tc 10.0 5.0 Inc 1.0 TI me cfs cfs cfs cfs cfs ft cfs 0.0 0.0 0.63 0.00 0.00 0.00 294.5 0.0 1.0 0.6 1.89 0.00 0.63 0.38 294.6 0.5 2.0 1.3 3.15 0.23 1.89 0.83 294.6 0.9 3.0 1.9 4.42 0.89 3.38 1.24 294.7 1.4 4.0 2.5 5.68 1.90 5.31 1.71 294.7 1.8 5.0 3.2 6.94 3.45 7.57 2.06 294.7 2.3 6.0 3.8 8.20 5.37 10.39 2.51 294.8 2.0 7.0 4.4 9.46 7.58 13.57 2.99 294.8 1.8 8.0 5.0 10.72 10.28 17.05 3.38 294.8 1.6 9.0 5.7 11.99 13.35 21.00 3.83 294.9 1.4 10.0 6.3 12.30 16.72 25.34 4.31 294.9 1.1 11.0 6.0 11.67 19.65 29.02 4.69 294.9 0.9 12.0 5.7 11.04 21.54 31.32 4.89 294.9 0.7 13.0 5.4 10.41 22.57 32.58 5.00 294.9 0.5 14.0 5.0 9.78 22.90 32.98 5.04 294.9 0.2 15.0 4.7 9.15 22.66 32.68 5.01 294.9 0.0 16.0 4.4 8.52 21.93 31.80 4.93 294.9 0.0 17.0 4.1 7.89 20.82 30.45 4.81 294.9 0.0 18.0 3.8 7.25 19.39 28.71 4.66 294.9 0.0 19.0 3.5 6.62 17.73 26.64 4.46 294.9 0.0 20.0 3.2 5.99 15.96 24.36 4.20 294.9 0.0 21.0 2.8 5.36 14.09 21.95 3.93 294.9 0.0 22.0 2.5 4.73 12.15 19.45 3.65 294.8 0.0 23.0 2.2 4.10 10.15 16.88 3.36 294.8 0.0 24.0 1.9 3.47 8.11 14.25 3.07 294.8 0.0 25.0 1.6 2.84 6.19 11.58 2.70 294.8 0.0 26.0 1.3 2.21 4.44 9.03 2.29 294.8 0.0 27.0 0.9 1.58 2.82 6.65 1.92 294.7 0.0 28.0 0.6 0.95 1.34 4.39 1.52 294.7 0.0 29.0 0.3 0.32 0.41 2.29 0.94 294.6 0.0 30.0 0.0 0.00 0.00 0.72 0.44 294.6 0.0 31.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 32.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 33.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 34.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 35.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 PEAK FLOWS 6 5 294.9 2 0. 00 indicates inital condition 0 w t/) -I 0 < Q. I-0 0 a:: I-Q. cfs 0.00 0.83 1.74 2.60 3.52 4.33 4.55 4.81 4.97 5.18 5.44 5.59 5.57 5.46 5.26 5.01 4.93 4.81 4.66 4.46 4.20 3.93 3.65 3.36 3.07 2.70 2.29 1.92 1.52 0.94 0.44 0.00 0.00 0.00 0.00 0.00 6 dra.xls Exhibit D-1 C> -I ~ < I-I-!!2 E~ cfs 0.00 0.54 1.08 1.62 2.15 2.69 3.23 3.77 4.31 4.85 5.38 5.12 4.85 4.58 4.31 4.04 3.77 3.50 3.23 2.96 2.69 2.42 2.15 1.88 1.62 1.35 1.08 0.81 0.54 0.27 0.00 0.00 0.00 0.00 0.00 0.00 5 EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Delta Gamma Sorority House D.A.# Pond Routing EVENT1: 10 D.A.# .... c J:. a Q. z as c c ... ~ 0 e ..... ~ 'C i + ..... c + ..... 'C + ~ c + c ~ ~ en en c 0-..... .E N N a Q.. w C") Qp 7.1 2.5 Tc 10.0 5.0 inc 1.0 TI me cfs cfs cfs cfs cfs ft cfs 0.0 0.0 0.71 0.00 0.00 0.00 294.5 0.0 1.0 0.7 2.12 0.00 0.71 0.43 294.6 0.5 2.0 1.4 3.54 0.33 2.12 0.90 294.6 1.0 3.0 2.1 4.96 1.11 3.67 1.36 294.7 1.5 4.0 2.6 6.37 2.42 6.07 1.63 294.7 2.0 5.0 3.5 7.79 4.26 6.79 2.25 294.7 2.5 6.0 4.2 9.20 6.52 12.07 2.77 294.6 2.3 7.0 5.0 10.62 9.26 15.73 3.24 294.6 2.0 6.0 5.7 12.04 12.48 19.86 3.70 294.6 1.6 9.0 6.4 13.45 16.08 24.52 4.22 294.9 1.5 10.0 7.1 13.61 20.07 29.53 4.73 294.9 1.3 11.0 6.7 13.10 23.64 33.68 5.12 294.9 1.0 12.0 6.4 12.39 25.99 36.74 5.37 294.9 0.8 13.0 6.0 11.68 27.35 36.36 5.52 295.0 0.5 14.0 5.7 10.97 27.88 39.03 5.58 295.0 0.3 15.0 5.3 10.27 27.73 36.85 5.56 295.0 0.0 16.0 5.0 9.56 27.03 36.00 5.48 295.0 0.0 17.0 4.6 8.85 25.87 36.59 5.36 294.9 0.0 18.0 4.2 8.14 24.33 34.72 5.19 294.9 0.0 19.0 3.9 7.43 22.49 32.48 4.99 294.9 0.0 20.0 3.5 6.73 20.39 29.92 4.77 294.9 0.0 21.0 3.2 6.02 18.10 27.12 4.51 294.9 0.0 22.0 2.8 5.31 15.77 24.12 4.17 294.9 0.0 23.0 2.5 4.60 13.41 21.08 3.83 294.9 0.0 24.0 2.1 3.89 11.03 18.02 3.49 294.8 0.0 25.0 1.8 3.19 8.64 14.93 3.15 294.6 0.0 26.0 1.4 2.48 6.36 11.82 2.73 294.8 0.0 27.0 1.1 1.77 4.31 8.83 2.26 294.7 0.0 26.0 0.7 1.06 2.43 6.08 1.63 294.7 0.0 29.0 0.4 0.35 0.94 3.49 1.27 294.7 0.0 30.0 0.0 0.00 0.00 1.29 0.67 294.6 0.0 31.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 32.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 33.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 34.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 35.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 PEAK FLOWS 7 6 295.0 3 0.00 indicates inital condition c w en _, 0 ct Q.. .... ~ g Q.. cfs 0.00 0.93 1.91 2.90 3.65 4.76 5.05 5.26 5.47 5.73 6.00 6.13 6.13 6.02 5.83 5.56 5.48 5.36 5.19 4.99 4.77 4.51 4.17 3.83 3.49 3.15 2.73 2.26 1.83 1.27 0.67 0.00 0.00 0.00 0.00 0.00 6 dra.xls Exhibit 0-1 C> _, ~ ct .... .... !!2 g~ cfs 0.00 0.60 1.21 1.61 2.42 3.02 3.63 4.23 4.84 5.44 6.04 5.74 5.44 5.14 4.84 4.53 4.23 3.93 3.63 3.32 3.02 2.72 2.42 2.12 1.81 1.51 1.21 0.91 0.60 0.30 0.00 0.00 0.00 0.00 0.00 0.00 6 EXHIBIT "D·1" PROPOSED DETENTION POND ROUTING Delta Gamma Sorority House D.A.# P.ond Routing EVENT= 25 D.A.# ,.., c z: a Q. t. C'll c c .. :e 0 8' .... a + I .... ;::; .... c -+ .... "D C'll "D + :e c + c > >-Cl) Cl) c 0 .! :J: .... -= N N a a. UJ C") Qp 8.1 2.9 Tc 10.0 5.0 inc 1.0 Time cfs cfs cfs cfs cfs ft cfs 0.0 0.0 0.81 0.00 0.00 0.00 294.5 0.0 1.0 0.8 2.43 0.00 0.81 0.49 294.6 0.6 2.0 1.6 4.04 0.47 2.43 0.98 294.6 1.2 3.0 2.4 5.66 1.40 4.51 1.56 294.7 1.7 4.0 3.2 7.28 3.09 7.06 1.98 294.7 2.3 5.0 4.0 8.90 5.36 10.37 2.50 294.8 2.9 6.0 4.9 10.51 8.12 14.26 3.07 294.8 2.6 7.0 5.7 12.13 11.51 18.63 3.56 294.8 2.3 8.0 6.5 13.75 15.40 23.64 4.12 294.9 2.0 9.0 7.3 15.36 19.75 29.15 4.70 294.9 1.7 10.0 8.1 15.77 24.66 35.12 5.23 294.9 1.4 11.0 7.7 14.96 29.03 40.43 5.70 295.0 1.2 12.0 7.3 14.15 31.95 43.99 6.02 295.0 0.9 13.0 6.9 13.34 33.70 46.10 6.20 295.0 0.6 14.0 6.5 12.53 34.46 47.04 6.29 295.0 0.3 15.0 6.1 11.73 34.43 47.00 6.28 295.0 0.0 16.0 5.7 10.92 33.74 46.15 6.21 295.0 0.0 17.0 5.3 10.11 32.50 44.65 6.08 295.0 0.0 18.0 4.9 9.30 30.82 42.61 5.89 295.0 0.0 19.0 4.4 8.49 28.77 40.12 5.67 295.0 0.0 20.0 4.0 7.68 26.43 37.26 5.42 294.9 0.0 21.0 3.6 6.87 23.83 34.11 5.14 294.9 0.0 22.0 3.2 6.06 21.03 30.70 4.84 294.9 0.0 23.0 2.8 5.26 18.08 27.10 4.51 294.9 0.0 24.0 2.4 4.45 15.17 23.34 4.09 294.9 0.0 25.0 2.0 3.64 12.28 19.62 3.67 294.8 0.0 26.0 1.6 2.83 9.40 15.92 3.26 294.8 0.0 27.0 1.2 2.02 6.64 12.23 2.80 294.8 0.0 28.0 0.8 1.21 4.19 8.66 2.23 294.7 0.0 29.0 0.4 0.40 1.96 5.40 1.72 294.7 0.0 30.0 0.0 0.00 0.44 2.37 0.96 294.6 0.0 31.0 0.0 0.00 0.00 0.44 0.27 294.5 0.0 32.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 33.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 34.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 35.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 PEAK FLOWS 8 6 295.0 3 0.00 indicates inital condition Q UJ Cl) ....I 0 ct 0. I-0 e If cfs 0.00 1.06 2.13 3.28 4.28 5.38 5.66 5.86 6.13 6.42 6.67 6.85 6.88 6.78 6.58 6.28 6.21 6.08 5.89 5.67 5.42 5.14 4.84 4.51 4.09 3.67 3.26 2.80 2.23 1.72 0.96 0.27 0.00 0.00 0.00 0.00 7 dra.xls Exhibit 0-1 0 ....I~ ct I-I-S!2 0 >< I-UJ cfs 0.00 0.69 1.38 2.07 2.76 3.45 4.14 4.83 5.52 6.21 6.90 6.56 6.21 5.87 5.52 5.18 4.83 4.49 4.14 3.80 3.45 3.11 2.76 2.42 2.07 1.73 1.38 1.04 0.69 0.35 0.00 0.00 0.00 0.00 0.00 0.00 7 EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Delta Gamma Sorority House D.A. # Pond Routing EVENT= 50 D.A.# ... c .s:. a a. t. • c c ... ~ ~ g> ..... q + ..... 'ti • ... c 32 + ..... 'ti + c + c > >. en en c 0 .!! :I: ..... = N N a Q. w C") Qp 9.1 3.2 Tc 10.0 5.0 Inc 1.0 Time cfs cfs cfs cfs cfs ft cfs 0.0 0.0 0.91 0.00 0.00 0.00 294.5 0.0 1.0 0.9 2.74 0.00 0.91 0.55 294.6 0.6 2.0 1.8 4.57 0.61 2.74 1.07 294.6 1.3 3.0 2.7 6.40 1.81 5.18 1.68 294.7 1.9 4.0 3.7 8.23 3.88 8.21 2.16 294.7 2.6 5.0 4.6 10.06 6.55 12.11 2.78 294.8 3.2 6.0 5.5 11.88 9.94 16.61 3.33 294.8 2.9 7.0 6.4 13.71 13.99 21.82 3.92 294.9 2.6 8.0 7.3 15.54 18.56 27.70 4.57 294.9 2.3 9.0 8.2 17.37 23.83 34.10 5.14 294.9 1.9 10.0 9.1 17.83 29.66 41.19 5.77 295.0 1.6 11.0 8.7 16.91 34.83 47.48 6.33 295.0 1.3 12.0 8.2 16.00 38.43 51.74 6.65 295.0 1.0 13.0 7.8 15.08 40.71 54.43 6.86 295.0 0.6 14.0 7.3 14.17 41.87 55.79 6.96 295.0 0.3 15.0 6.9 13.25 42.08 56.04 6.98 295.0 0.0 16.0 6.4 12.34 41.48 55.33 6.93 295.0 0.0 17.0 5.9 11.43 40.19 53.82 6.81 295.0 0.0 18.0 5.5 10.51 38.33 51.62 6.65 295.0 0.0 19.0 5.0 9.60 35.97 48.84 6.44 295.0 0.0 20.0 4.6 8.68 33.25 45.57 6.16 295.0 0.0 21.0 4.1 7.77 30.27 41.94 5.83 295.0 0.0 22.0 3.7 6.86 27.06 38.04 5.49 295.0 0.0 23.0 3.2 5.94 23.67 33.92 5.12 294.9 0.0 24.0 2.7 5.03 20.14 29.62 4.74 294.9 0.0 25.0 2.3 4.11 16.58 25.17 4.29 294.9 0.0 26.0 1.8 3.20 13.12 20.70 3.79 294.9 0.0 27.0 1.4 2.29 9.71 16.32 3.30 294.8 0.0 28.0 0.9 1.37 6.48 12.00 2.76 294.8 0.0 29.0 0.5 0.46 3.64 7.85 2.11 294.7 0.0 30.0 0.0 0.00 1.21 4.09 1.44 294.7 0.0 31.0 0.0 0.00 0.00 1.21 0.64 294.6 0.0 32.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 33.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 34.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 35.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 PEAK FLOWS 9 7 295.0 3 0.00 indicates inital condition 0 w en ...I 0 <C Q. I-0 0 Q: I-c.. cfs 0.00 1.20 2.36 3.63 4.76 6.02 6.25 6.51 6.84 7.08 7.39 7.62 7.63 7.51 7.29 6.98 6.93 6.81 6.65 6.44 6.16 5.83 5.49 5.12 4.74 4.29 3.79 3.30 2.76 2.11 1.44 0.64 0.00 0.00 0.00 0.00 8 0 ...I~ <C I-I-!!2 g rti cfs dra.xls Exhibit 0-1 · 8 0.00 0.78 1.56 2.34 3.12 3.90 4.68 5.46 6.24 7.02 7.80 7.41 7.02 6.63 6.24 5.85 5.46 5.07 4.68 4.29 3.90 3.51 3.12 2.73 2.34 1.95 1.56 1.17 0.78 0.39 0.00 0.00 0.00 0.00 0.00 0.00 EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Delta Gamma Sorority House D.A.# Pond Routing EVENT= 100 D.A. # .... c .t:. a a. + ~ c -c .. a "O 0 gi .... -"O ii + I .... .. c .. + .... "O + ~ c + c > >-(/) (/) c 0 .!! :I: .... c N N a Q. w C") Qp 10.3 3.6 Tc 10.0 5.0 Inc 1.0 TI me cfs cfs cfs cfs cfs ft cfs 0.0 0.0 1.03 0.00 0.00 0.00 294.5 0.0 1.0 1.0 3.08 0.00 1.03 0.59 294.6 0.7 2.0 2.1 5.14 0.76 3.08 1.16 294.7 1.5 3.0 3.1 7.19 2.30 5.89 1.80 294.7 2.2 4.0 4.1 9.24 4.76 9.49 2.37 294.8 2.9 5.0 5.1 11.30 7.92 14.00 3.04 294.8 3.6 6.0 6.2 13.35 11.97 19.22 3.63 294.8 3.3 7.0 7.2 15.41 16.70 25.32 4.31 294.9 2.9 8.0 8.2 17.46 22.19 32.11 4.96 294.9 2.5 9.0 9.2 19.52 28.39 39.65 5.63 295.0 2.2 10.0 10.3 20.03 35.17 47.90 6.36 295.0 1.8 11.0 9.8 19.00 41.37 55.20 6.92 295.0 1.5 12.0 9.2 17.98 45.76 60.37 7.31 295.0 1.1 13.0 8.7 16.95 48.61 63.73 7.56 295.1 0.7 14.0 8.2 15.92 50.15 65.55 7.70 295.1 0.4 15.0 7.7 14.89 50.59 66.07 7.74 295.1 0.0 16.0 7.2 13.87 50.10 65.49 7.70 295.1 0.0 17.0 6.7 12.84 48.80 63.96 7.58 295.1 0.0 18.0 6.2 11.81 46.83 61.64 7.40 295.1 0.0 19.0 5.6 10.79 44.29 58.65 7.18 295.0 0.0 20.0 5.1 9.76 41.26 55.08 6.91 295.0 0.0 21.0 4.6 8.73 37.82 51.02 6.60 295.0 0.0 22.0 4.1 7.70 34.06 46.55 6.24 295.0 0.0 23.0 3.6 6.68 30.13 41.76 5.82 295.0 0.0 24.0 3.1 5.65 26.05 36.80 5.38 294.9 0.0 25.0 2.6 4.62 21.85 31.70 4.92 294.9 0.0 26.0 2.1 3.60 17.60 26.47 4.44 294.9 0.0 27.0 1.5 2.57 13.50 21.19 3.85 294.9 0.0 28.0 1.0 1.54 9.52 16.07 3.27 294.8 0.0 29.0 0.5 0.51 5.84 11.06 2.61 294.8 0.0 30.0 0.0 0.00 2.61 6.35 1.87 294.7 0.0 31.0 0.0 0.00 0.55 2.61 1.03 294.6 0.0 32.0 0.0 0.00 0.00 0.55 0.33 294.6 0.0 33.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 34.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 35.0 0.0 0.00 0.00 0.00 0.00 294.5 0.0 ·PEAK FLOWS 10 8 295.1 4 0. 00 indicates in ital condition · 0 w en ..J 0 ct Q. I-0 0 0:: ~ Q. cfs 0.00 1.32 2.61 3.98 5.27 6.67 6.89 7.21 7.50 7.81 8.18 8.37 8.40 8.29 8.06 7.74 7.70 7.58 7.40 7.18 6.91 6.60 6.24 5.82 5.38 4.92 4.44 3.85 3.27 2.61 1.87 1.03 0.33 0.00 0.00 0.00 8 dra.xls Exhibit 0-1 0 ..I~ ct I-I-!l 0 >< I-w cfs 0.00 0.88 1.75 2.63 3.51 4.38 5.26 6.14 7.01 7.89 8.77 8.33 7.89 7.45 7.01 6.58 6.14 5.70 5.26 4.82 4.38 3.95 3.51 3.07 2.63 2.19 1.75 1.32 0.88 0.44 0.00 0.00 . 0.00 0.00 0.00 0.00 9 a Delta Gamma Sorority House 5 Year Event Hydrograph 7.00 ~--------------------------------------. 6 .00 5.00 4 .00 3.00 - 2 .00 1.00 0.00 +------+-----+-----+-------l-----+-----"1-....__ __ __,,__ ___ -! 0 .00 5.00 10.00 15.00 20 .00 Time(mln.) 25.00 30.00 35.00 40.00 --1 --Qn+1 3 8 2 --TOTAL PROPOSED - - -TOTAL EXIST ING 10/6/98 Exhibit D-2 Delta Gamma Sorority House 10 Year Event Hydrograph 7 .00 6.00 5.00 ~ ~ 4 .00 a 3 .00 2 .00 1.00 0 .00 +-----+----+-----+----+-----+------'"!----''-----+---~ 0 .00 5 .00 10.00 15 .00 20 .00 Time(min.) 25.00 30.00 35.00 40.00 --1 --Qn+1 3 B 2 --TOTAL PROPOSED - - -TOTAL EXISTING 10/6/98 Exhibit 0-2 -.!!! ~ a Delta Gamma Sorority House 25 Year Event Hydrograph 8.00 7.00 6 .00 5.00 4 .00 3.00 2 .00 1.00 0 .00 ---------------------+-----+-------"'~------- 0.00 5.00 10 .00 15 .00 20 .00 Time(m i n.) 25 .00 30 .00 35 .00 40.00 --1 --Qn+1 3 s. 2 --TOTAL PROPOSED - - -TOTAL EXISTING 10/6/98 Exhibit D-2 10.00 9 .00 8 .00 7 .00 6 .00 !' .!:!.. 5.00 a 4 .00 3.00 2 .00 1.00 0.00 0 .00 5.00 10.00 15 .00 Delta Gamma Sorority House 50 Year Event Hydrograph 20.00 Tlme(min.) 25.00 30.00 35.00 40.00 --1 --Qn+1 3 a 2 --TOTAL PROPOSED - - -TOTAL EXISTING 10/6/98 Exhibit D-2 -~ a Delta Gamma Sorority House 100 Year Event Hydrograph 10 .00 8.00 6 .00 4 .00 2 .00 0 .00---~~~--~~~--+-~~~~---~~~-+-~~~--1-~~~--''1--~---~--~~~-- o.oo 5.00 10.00 15.00 20.00 Tlme(mln.) 25 .00 30.00 35.00 40.00 --1 --Qn+1 382 --TOTAL PROPOSED - - -TOTAL EXISTING 10/6/98 Exhibit D-2 Pond 1 EXHIBIT 0-3 STAGE-STORAGE/STAGE-DISCHARGE TABLE Delta Gamma.Sorority House Elevation Area Area Inc. Volm. Volume Outlet 1 Outlet 2 Total (ft.) (sf.) {acres) (ac.-ft.) (ac.-ft.) Invert Elev. (ft.) 294.5 295 (cfs) Oriface Dia. {in.) or Weir Length (ft.) 6 0 Flow (cfs) Flow (cfs) 294.5 0 0.000 0.000 0.000 0.00 0.00 0.00 294.6 334.4 0.008 0.000 0.000 0.57 0.00 0.57 294.7 1424.1 0.033 0.002 0.002 1.61 0.00 1.61 294.8 2987.7 0.069 0.005 0.007 2.96 0.00 2.96 294.9 4686.3 0.108 0.009 0.016 4.55 0.00 4.55 295 6500.2 0.149 0.013 0.029 6.36 0.00 6.36 295.1 8200 0.188 0.017 0.045 8.37 0.00 8.37 295.2 10000 0.230 0.021 0.066 10.54 0.00 10.54 295.3 10000 0.230 0.023 0.089 12.88 0.00 12.88 295.4 10000 0.230 0.023 0.112 15.37 0.00 15.37 Page 1 Delta Gamma Sorority House Stage-Discharge Curve 0 .000+-~~~-....-:::~~~-+-~~~~1--~~~-t-~~~~+-~~~--+~~~~-+-~~~~1--~~~-+-~~~----1 294.4 294.5 294.6 294 .7 294.8 294.9 Elevation (msl) 295 .0 295.1 295 .2 295.3 295 .4 Exhibit D-3 ~ ! 0.090 0 .080 0 .070 0 .060 f 0 .050 s en 0.040 0 .030 0 .020 0.0 10 Delta Gamma Sorority House Stage-Storage Curve o .ooo.l-~~~+-~~---+-=========:~~~--+~~~~+--~~~+-~~~--+-~~~--+-~~~--+~~~~ 294.4 294 .5 294 .6 294 .7 294 .8 294 .9 Elevation (msl) 295 295.1 295 .2 295 .3 295 .4 Exhibit D-3