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Gateway BP(1.4)-CS 960327
Ill · ,, Halff Associates ENGINEERS · ARCHITECTS ° SCIENTISTS PLANNERS · SURVEYORS 8516 NORTHWEST PLAZA DRIVE DALLAS, TEXAS 75225 (214) 739-0094 FAX (214) 739-0095 City of Coppell 255 Parkway Blvd. Coppell, TX 75019 March 27, 1996 AVO 15315 ATTN: Mr. Michael A. Martin RE: Gateway Business Park Drainage Improvements Dear Mr. Martin: We are pleased to submit two (2) sets of the following civil construction drawings for your review and comment: · Cover Sheet · Final Plat ....................................................... FP-1 · Survey Control ................................................. SC- 1 · Drainage Area Map .......................................... DA-1 · Drainage Plan & Profile ................................... D-1 · Drainage Plan & Profile ................................... D-2 · Erosion Control Plan ........................................ EC-1 Attached please also find two (2) copies of our detention calculations for the above referenced project. If you have any questions or need any additional information, please do not hesitate to call either Pat Acker or myself. Sincerely, Attachments CC~ HALFF ASSOCIATES, INC. M. Cristina Gonzalez-Criado, E.I.T. Preston Stokes, Haverty's Furniture Companies, Inc., VIA FAX (404) 870-9458 Mike Newdow, Stang & Newdow, VIA FAX (404) 586-0333 Steve Brian, Catellus Development Corporation, VIA FAX (214) 719-6117 DALLAS ° FORTWORTH · HOUSTON · ARLINGTON ° McALLEN ° CHICAGO TRANSPORTATION · WATER RESOURCES · LAND DEVELOPMENT ° MUNICIPAL · ENVIRONMENTAL · STRUCTURAL MECHANICAL · ELECTRICAL · SURVEYING ° GEOGRAPHIC INFORMATION SYSTEMS ARCHITECTURE ° LANDSCAPE ARCHITECTURE · PLANNING Detention Calculations Modified Rational Method Haverty/Catellus Site I:~AVO\15315\DETEN~DET1 .WQ1 3/21/96 AREA NO. 1 100-YEAR )A ~ist. C FC Exist Future C TC Future Exist Peak Q 169.5592 [uture peak Q 367.3782 NET STOl:IA( I 100(hydro35/tp40) (CU.FT.) 10 8.88 128227.617 12 8.35 154106.6796 14 7.82 173281.221 15 7.56 180591.4845 17 7.33 128227.617 19 7.09 1 54106.6796 20 6.97 237382.866 30 5.8 180591.4845 40 5.19 205869.6702 50 4.57 366559.236 60 3.96 237382.866 70 3.35 295937.955 80 2.73 182014.614 90 2.12 43861.581 1 O0 1.51 -132874.074 DURA'nO Q IN (CU.FT.) (ACRE-ET) 0 0 0 0 0 0 0 10 468,05148 169.5592 280830,9 152603.3 128227.617 2.9437 12 440.115975 169.5592 316883.5 162776.8 154106.6796 3,5378 14 412.18047 169.5592 346231.6 172950.4 173281.221 3.978 15 398.47626 169.5592 358628.6 178037.1 180591.4845 4.1458 17 386.35,3305 169.5592 394080.4 188210.7 205869.6702 4.7261 19 373.703265 169.5592 426021.7 198384.3 227637.4698 5.2258 20 367.378245 169.5592 440853.9 203471 237382.866 5.4496 30 305.7093 169.5592 550276.7 254338.8 295937.955 6.7938 Q OUT INFLOW OUTFLO NET STORAG NET STORAG 40 273.557115 169.5592 656537.1 305206.5 351330.5,,34 8.0654 60 208.72566 169.5592 751412.4 406942.1 344470.32 7,908 70 176.573475 169.5592 741608.6 457809.8 283798.782 6.5151 80 143.894205 169.5592 690692.2 508677,6 182014.614 4.1785 90 111.74202 169.5592 603406.9 559545.3 43861.581 1.0069 =~100 79.589835 169.5592 477539 610413.1 -132~4.074 --3.0504 ~ALBERT H. ]:~tLFF A~SOCZATE~, [NC. ENGINEERS. SURVEYORS. SCZENT[S3~ ]~t~3.nV[INARY - ~ INTERIM REVIEW ONLY