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HomeMy WebLinkAboutDriveway Culvert Design SummaryDate: From: Subject: Remarks: TEX CON TRANSMITTAL February 21 , 2005 Carol Cotter Development Services City of College Station Joe Schultz, P .E. ~ Texcon General cl;:1tractors 1707 Graham Road College Station, Texas 77845 Phone: (979) 764-7743 Proposed Driveway Culvert Design Summary Williams Creek Subdivision -Phase 2 College Station, Texas Attached is a summary of the driveway culvert design for Williams Creek Phase 2. The drainage areas for each driveway culvert are shown on Exhibit A. The culverts were designed to pass the 10-year stonn event runoff with headwater equal to or less than the diameter of the pipe. Please contact me if you have any questions. Williams Creek Subdivision -Phase 2 Driveway Culvert Summary Block# Lot# # of Pipe size % Slope Barrels (in) 1 10 1 12" 0.60% ----... - -----11 1 12" 0.60% -----·--------------12 1 12" 0.60% --------·--------------13 1 15" 0.60% - - ------------14 1 15" 2.20% - - ---------------15 1 15" 3.00% ------16 1 15" 3.00% --~------ 17 1 18" 0.80% ------·--33 1 12" 0.60% -------34 1 12" 0.60% ---------------35 1 12" 0.60% ----36 1 15" 0.60% --------37 1 15" 0.60% 3 1 1 24" 1.85% ------2 2 24" 0.60% -------- 3 2 24" 0.60% --·----4 2 24" 0.60% -----5 2 30" 2.20% -------6 2 30" 3.00% ------------7 2 30" 0.80% -----· -----20 1 12" 0.60% -------··----21 1 15" 0.60% --- 22 1 18" 0.60% -----·--23 1 18" 0.60% -----24 1 18" 0.60% -------25 1 24" 1.11% ---·-· ------·-26 1 24" 0.60% 4 1 2 24" 4.59% --------2 1 12" 0.60% -·-. -----3 1 12" 0.60% ------- 4 1 12" 0.60% ----------------·- 5 1 12" 0.60% --------6 1 12" 0.60% -------------------7 1 12" 0.60% - - --- 8 1 12" 0.60% Tc Contributing Contributing 0 10 Area No. (n) Area (An) 10.0 L1 0.13 0.57 10.0 L 1-L2 0.31 1.34 10.0 L 1-L3 0.45 1.94 ------· 10.0 L 1-L4 0.56 2.42 ---10.0 L 1-L5 0.69 2.98 -------10.0 L 1-L6 0.78 3.37 ------- 10.7 L 1-L7 0.92 3.86 -------· -12.6 L 1-L8 1.05 4.10 ---------·--- -10.0 L23 0.10 0.45 --------10.0 L23-L24 0.30 1.30 --------- 10.0 L23-L25 0.46 1.99 ---------10.0 L23-L26 0.67 2.89 ----------11.4 L23-L27 0.79 3.23 11 .6 L15 2.04 8.25 -- ------13.3 L 14-L 15 4.19 15.96 ··-------15.2 L 13-L 15 5.88 21 .01 ---------------17.8 L12-L15 7.21 23.80 --------19.8 L 11-L 15 9.16 28 .59 -------------- 21 .2 L 10-L 15 10.23 30 .78 -----------------23.2 L9-L 15 12.83 36.73 ----- -17.0 L22 0.30 1.01 ------ - 19.2 L21-L22 0.98 3.11 ------20.8 L20-L22 1.43 4.35 -----22.7 L 19-L22 2.07 6.00 --25.1 L 18-L22 2.72 7.45 ------27.1 L 17-L22 3.06 8.02 --28.7 L 16-L22 3.16 8.01 14.1 L28-L34 4.21 15.60 ----10.0 L31-L33 0.47 2.03 ------·--------10.0 L31-L32 0.32 1.38 ---------------------10.0 L31 0.19 0.82 ---------10.0 L31 0.19 0.82 ------10.0 L30 0.06 0.26 --------- 10.0 L29-L30 0.23 0.99 ------------10.0 L28-L30 0.43 1.86 ~ ~ d Lo~ \__ \c\6~ 'd .d-\-~S \ '_SQfV\.-..._ Drainage Area Cales. Driveway Culverts Area 5 year storm c le Area# (acres) Is Os A (min) (in/hr) (cfs) L1 0.13 0.50 10.0 7.693 0.50 L 1-L2 0.31 0.50 10.0 7.693 1.19 L 1-L3 0.45 0.50 10.0 7.693 1.73 L 1-L4 0.56 0.50 10.0 7.693 2.15 L 1-L5 0.69 0.50 10.0 7.693 2.65 L 1-L6 0.78 0.50 10.0 7.693 3.00 L 1-L7 0.92 0.50 10.7 7.472 3.44 L 1-L8 1.05 0.50 12.6 6.938 3.64 L9-L 15 12.83 0.50 23.2 5.041 32.34 L 10-L 15 10.23 0.50 21 .2 5.305 27.14 L 11-L 15 9.16 0.50 19.8 5.510 25.24 L 12-L 15 7.21 0.50 17.8 5.836 21 .04 L 13-L 15 5.88 0.50 15.2 6.333 18.62 L 14-L15 4.19 0.50 13.3 6.763 14.17 L15 2.04 0.50 11 .6 7.208 7.34 L 16-L22 3.16 0.50 28.7 4.446 7.02 L 17-L22 3.06 0.50 27.1 4.602 7.04 L 18-L22 2.72 0.50 25.1 4.815 6.55 L 19-L22 2.07 0.50 22.7 5.104 5.28 L20-L22 1.43 0.50 20.8 5.362 3.83 L21-L22 0.98 0.50 19.2 5.604 2.75 L22 0.30 0.50 17.0 5.980 0.90 L23 0.10 0.50 10.0 7.693 0.40 L23-L24 0.30 0.50 10.0 7.693 1.15 L23-L25 0.46 0.50 10.0 7.693 1.77 L23-L26 0.67 0.50 10.0 7.693 2.58 L23-L27 0.79 0.50 11.4 7.265 2.87 L28-L30 0.43 0.50 10.0 7.693 1.65 L29-L30 0.23 0.50 10.0 7.693 0.88 L30 0.06 0.50 10.0 7.693 0.23 L31 0.19 0.50 10.0 7.693 0.73 L31-L32 0.32 0.50 10.0 7.693 1.23 L31-L33 0.47 0.50 10.0 7.693 1.81 L28-L34 4.21 0.50 14.1 6.574 13.84 The Rational Method: Q = CIA I = b I (tc+d)• Q = Flow (cfs) A= Area (acres) le = Time of concentration (min) C = Runoff Coeff. I = Rainfall Intensity (in/hr) Brazos County. 5 year storm 10 year storm b = 76 b = 80 d = 8.5 d = 8.5 e= 0.79 e= 0.763 25 year storm b = 89 d = 8.5 e = 0.75 10 year storm 25 year storm 50 year storm 110 (in/hr) 8.635 8.635 8.635 8.635 8.635 8.635 8.393 7.810 5.725 6.017 6.243 6.602 7.148 7.618 8.105 5.067 5.240 5.476 5.795 6.080 6.346 6.759 8.635 8.635 8.635 8.635 8.167 8.635 8.635 8.635 8.635 8.635 8.635 7.411 0 10 l2s (cfs) (in/hr) 0.57 9.861 1.34 9.861 1.94 9.861 2.42 9.861 2.98 9.861 3.37 9.861 3.86 9.589 4.10 8.931 36.73 6.570 30.78 6.901 28.59 7.157 23.80 7.564 21.01 8.181 15.96 8.714 8.25 9.264 8.01 5.824 8.02 6.020 7.45 6.288 6.00 6.650 4.35 6.972 3.11 7.274 1.01 7.742 0.45 9.861 1.30 9.861 1.99 9.861 2.89 9.861 3.23 9.334 1.86 9.861 0.99 9.861 0.26 9.861 0.82 9.861 1.38 9.861 2.03 9.861 15.60 8.480 tc = L/(V*60) L = Length (ft 0 2s lso Oso (cfs) (in/hr) (cfs) 0.65 11.148 0.73 1.53 11.148 1.73 2.22 11.148 2.5 1 2.76 11.148 3.12 3.40 11.148 3.85 3.85 11.148 4.35 4.41 10.843 4.99 4.69 10.107 5.3 1 42.15 7.463 47.88 35.30 7.835 40.07 32.78 8.122 37.20 27.27 8.577 30.92 24.05 9.269 27.25 18.25 9.865 20.67 9.43 10.480 10.67 9.20 6.625 10.47 9.21 6.845 10.47 8.55 7.147 9.72 6.88 7.552 7.82 4.99 7.914 5.66 3.56 8.252 4.04 1.16 8.777 1.32 0.52 11.148 0.58 1.48 11.148 1.67 2.27 11.148 2.56 3.30 11.148 3.73 3.69 10.558 4.17 2.12 11.148 2.40 1.13 11.148 1.28 0.30 11.148 0.33 0.94 11.148 1.06 1.58 11.148 1.78 2.32 11.148 2.62 17.85 9.603 20.21 V =Velocity (fl/sec) 50 year storm b = 98 d = 8.5 e = 0.745 100 year storm b = 96 d = 8.0 e = 0.730 2/8/2005 100 year storm I 100 0 100 (in/hr) (cfs) 11 .639 0.76 11 .639 1.80 11 .639 2.62 11 .639 3.26 11 .639 4.02 11.639 4.54 11 .319 5.21 10.547 5.54 7.790 49.97 8.176 41 .82 8.475 38.81 8.949 32.26 9.671 28.43 10.293 21 .56 10.938 11 .13 6.919 10.93 7.148 10.94 7.461 10.15 7.882 8.16 8.259 5.91 8.611 4.22 9.157 1.37 11 .639 0.61 11 .639 1.75 11 .639 2.68 11 .639 3.90 11 .020 4.35 11 .639 2.50 11 .639 1.34 11 .639 0.35 11 .639 1.11 11 .639 1.86 11 .639 2.74 10 020 21.09 Tc Calculations-Post Development Driveway Pipes Drainage Area #L 1 Concentrated Flow 1 : V= 1.25 fps (unpaved) L= 48 Elev1= Elev2= Slope= 0.006 Tt= L/(60*V) = 0.6 min Concentrated Flow 2: V= 2.2 fps (unpaved) L= 104 Elev1= Elev2= Slope= 0.019 T1= L/(60*V) = 0.8 min ITc= 1.4 min Drainage Area #L2 Concentrated Flow 1 : V= 1.25 fps (unpaved) L= 210 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 2.8 min ITc= 4.2 min Drainage Area #L3 Concentrated Flow 1 : V= 1.25 fps (unpaved) L= 174 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 2.3 min ITc= 6.5 min Drainage Area #L4 Concentrated Flow 1 : V= 1.25 fps (unpaved) L= 96 Elev,= Elev2= Slope= 0.006 Tt= L/(60*V) = 1.3 min Concentrated Flow 2: V= 2.4 fps (unpaved) L= 48 Elev1= Elev2= Slope= 0.022 Tl= L/(60*V) = 0.3 min ITc= 8.1 min Drainage Area #LS Concentrated Flow 1 : V= 2.4 fps (unpaved) L= 161 Elev1= Elev2= Slope= 0.022 Ti= L/(60*V) = 1.1 min ITc= 9.2 min Drainage Area #LG Concentrated Flow 1 : V= 2.8 fps (unpaved) L= 108 Elev1= Elev2= Slope= 0.030 Ti= L/(60*V) = 0.6 min ITc= 9.8 min Drainage Area #L7 Concentrated Flow 1: V= 2.8 fps (unpaved) L= 158 Elev1= Elev2= Slope= 0.030 Ti= L/(60*V) = 0.9 min ITc= 10.7 min Drainage Area #L8 Concentrated Flow 1 : V= 1.4 fps (unpaved) L= 161 Elev1= Elev2= Slope= 0.008 Tl= L/(60*V) = 1.9 min ITc= 12.6 min Drainage Area #L 15 Sheet Flow: n= 0 .15 (short grass prairie) P= 4.5 L= 200 Elev,= Elev2= Slope= 0.050 T1= 0.007(L *nt " = 0.166 hours= 10 min (P)os*(S)o4 Concentrated Flow 1 : V= 4.2 fps (unpaved) L= 355 Elev,= Elev2= Slope= 0.068 T1= L/(60*V) = 1.4 min Concentrated Flow 2: V= 2.2 fps (unpaved) L= 25 Elev1= Elev2= Slope= 0.019 T1= L/(60*V) = 0.2 min ITc= 11.6 min Drainage Area #L 14 Concentrated Flow 1 : V= 1.25 fps (unpaved) L= 124 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 1.7 min ITc= 13.3 min Drainage Area #L 13 Concentrated Flow 1 : V= 1.25 fps (unpaved) L= 145 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 1.9 min ITc= 15.2 min Drainage Area #L 12 Concentrated Flow 1: V= 1.25 fps (unpaved) L= 192 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 2.6 min ITc= 17.8 min Drainage Area #L 11 Concentrated Flow 1 : V= 1.25 fps (unpaved) L= 45 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 0.6 min Concentrated Flow 2: V= 2.4 fps (unpaved) L= 200 Elev1= Elev2= Slope= 0.022 T1= L/(60*V) = 1.4 min ITc= 19.8 min Drainage Area #L10 Concentrated Flow 1: V= 2.8 fps (unpaved) L= 240 Elev1= Elev2= Slope= 0.030 T1= L/(60*V) = 1.4 min ITc= 21 .2 min Drainage Area #L9 Concentrated Flow 1 : V= 1.4 fps (unpaved) L= 164 Elev1= Elev2= Slope= 0.008 T1= L/(60*V) = 2.0 min ITc= 23.2 min Drainage Area #L22 Sheet Flow: n= 0.15 (short grass prairie) P= 4.5 L= 132 Elev1= Elev2= Slope= 0.006 Ti= 0.007(L *nt(l = 0.278 hours= 16.7 min (P)os*(S)o4 Concentrated Flow 1: V= 1.25 fps (unpaved) L= 24 Elev1= Elev2= Slope= 0.006 Ti= L/(60*V) = 0.3 min ITc= 17.0 min Drainage Area #L21 Concentrated Flow 1: V= 1.25 fps (unpaved) L= 162 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 2.2 min ITc= 19.2 min Drainage Area #L20 Concentrated Flow 1: V= 1.25 fps (unpaved) L= 117 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 1.6 min ITc= 20.8 min Drainage Area #L 19 Concentrated Flow 1: V= 1.25 fps (unpaved) L= 146 Elev1= Elev2= Slope= 0.006 T,= L/(60*V) = 1.9 min ITc= 22.7 min Drainage Area #L 18 Concentrated Flow 1: V= 1.25 fps (unpaved) L= 181 Elev1= Elev2= Slope= 0.006 T = t L/(60*V) = 2.4 min ITc= 25.1 min Drainage Area #L 17 Concentrated Flow 1 : V= 1.7 fps (unpaved) L= 202 Elev1= Elev2= Slope= 0.011 T1= L/(60*V) = 2.0 min ITc= 27.1 min Drainage Area #L 16 Concentrated Flow 1: V= 1.25 fps (unpaved) L= 117 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 1.6 min ITc= 28.7 min Drainage Area #L23 Concentrated Flow 1 : V= 1.25 fps (unpaved) L= 136 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 1.8 min ITc= 1.8 min Drainage Area #L24 Concentrated Flow 1: V= 1.25 fps (unpaved) L= 238 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 3.2 min ITc= 5.0 min Drainage Area #L25 Concentrated Flow 1 : V= 1.25 fps (unpaved) L= 211 Elev1= Elev2= Slope= 0.006 Ti= L/(60 *V) = 2.8 min ITc= 7.8 min Drainage Area #L26 Concentrated Flow 1 : V= 1.25 fps (unpaved) L= 90 Elev,= Elev2= Slope= 0.006 Ti= L/(60*V) = 1.2 min Concentrated Flow 2: V= L= 65 Elev,= Elev2= Slope= 0.011 Ti= L/(60*V) = 0.6 min ITc= 9.6 min Drainage Area #L27 Concentrated Flow 1 : V= 1.7 fps (unpaved) L= 34 Elev1= Elev2= Slope= 0.01 1 Ti= L/(60*V) = 0.3 min Concentrated Flow 2: V= 1.25 fps (unpaved) L= 114 Elev,= Elev2= Slope= 0.006 Ti= L/(60*V) = 1.5 min ITc= 11.4 min Drainage Area #L30 Concentrated Flow 1: V= 1.25 fps (unpaved) L= 60 Elev,= Elev2= Slope= 0.006 Ti= L/(60*V) = 0.8 min ITc= 0.8 min Drainage Area #L29 Concentrated Flow 1 : V= 1.25 fps (u npaved} L= 193 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 2.6 min ITc= 3.4 min Drainage Area #L28 Concentrated Flow 1: V= 1.25 fps (unpaved) L= 232 Elev1= Elev2= Slope= 0.066 T1= L/(60*V) = 3.1 min ITc= 6.5 min Drainage Area #L31 Concentrated Flow 1 : V= 1.25 fps (unpaved) L= 181 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 2.4 min ITc= 2.4 min Drainage Area #L32 Concentrated Flow 1 : V= 1.25 fps (unpaved) L= 166 Elev1= Elev2= Slope= 0.006 T1= L/(60*V) = 2.2 min ITc= 4.6 min Drainage Area #L33 Concentrated Flow 1 : V= 1.25 fps (unpaved} L= 183 Elev1= Elev2= Slope= 0.006 T,= L/(60*V) = 2.4 min ITc= 7.0 min Drainage Area #L34 Sheet Flow: L= 300 n= P= 0.007(L *ntt} = (P}os*(S)o4 Concentrated Flow 1: V= L= L/(60*V) = Concentrated Flow 2: V= L= L/(60*V) = 0.15 (short grass prairie) 4.5 Elev1= 0.214 hours= 12.8 ·min 41fps (unpaved) Elev1= 0.7 min 3.4 fps (unpaved) 0.6 min 14.1 min 266.5 Slope= 0.060 Slope= 0.063 Slope= 0.046