Final Baseline Hydrology Report - October 2012 - Urban Drainage ...

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Sanderson Gulch Major Drainageway Plan Baseline Hydrology Report October 2012 3.6 Comparison to Previous Studies Comparison of peak discharges from the 1972 MDP with values computed in this study for the 2012 MDP is provided in Table 3-6. Peak discharges determined in the 2012 MDP update are significantly higher than the 1972 MDP throughout the basin with a 25 percent increase in 100-year peak discharge occurring at the outfall to the South Platte River. Sanderson Gulch Locations Peak Flow (cfs) Table 3-6 Comparison to Previous Studies 32 Peak Flow USDCM Ver. 2001 2-hour Rainfall (I = 2.57 in/hr) & Distribution (cfs) Confluence at S Platte River Sanderson_Out 4900 4749 3350 5168 4621 4023 20% 3271 -2% 4177 25% Peak flow excludes trans-basin flow from Mississippi Gulch and Federal Blvd which were not included in 1972 MDP. W Florida Avenue 1106 4716 4549 3250 4950 4403 4007 23% 3214 -1% 3971 22% Peak flow rate excludes offsite basin flow from Federal Blvd which were not included in 1972 MDP. Federal Blvd 1114 4377 4215 2880 4641 4094 3945 37% 2850 -1% 3558 24% Peak flow rate excludes offsite basin flow from Federal Blvd which were not included in 1972 MDP. S Knox Ct - 3971 3951 2400 - - - - 2444 2% 3329 39% Per basin delineation and hydrograph routing, this is the best comparable design point with design point 1124 in 2012 MDP. S Lowell Blvd 1124 3439 3397 1830 4046 3806 3838 110% 2444 34% 3329 82% Per basin delineation and hydrograph routing, the best comparable design point from 1972 MDP is at S Knox Ct. Sheridan Blvd 1145 2870 2837 1450 2933 2783 3031 109% 1352 -7% 2450 69% Bit-O-Sea reservoir - Out Bit-O-Sea_Out 2580 2555 1300 2758 2608 2861 120% 1270 -2% 2272 75% Bit-O-Sea reservoir - In Bit-O-Sea 2580 2555 1500 2758 2608 2968 98% 1465 -2% 2307 54% Clairefield Reservoir - Out Clairefield_Out 2580 2555 1470 2618 2468 2816 92% 1431 -3% 2256 53% Clairefield Reservoir - In Clairefield 2580 2555 1800 2618 2468 2870 59% 1801 0% 2653 47% Confluence with N.S. G. 4 - Downstream 1157 2298 2270 1330 2179 2179 2595 95% 1553 17% 2125 60% Confluence with N.S.G. 4 - Upstream 1162T 1435 1414 620 1431 1431 1403 126% 612 -1% 1017 64% Green Gable Entrance Road - Out GG_Entrance_Out - - 580 1335 1335 1296 123% 569 -2% 947 63% Green Gable Entrance Road - In GG_Entrance - - 950 1335 1335 1324 39% 930 -2% 1180 24% Wadsworth Blvd. 1167 1178 1162 670 1169 1169 1127 68% 683 2% 988 47% W. Jewell Avenue 1169 1009 994 520 976 976 844 62% 528 2% 729 40% Jewell Park - Out Jewell_Out 840 820 375 746 746 517 38% 372 -1% 519 38% Jewell Park - In Jewell 840 820 505 746 746 641 27% 503 0% 599 19% Kendrick Reservoir - Out Kendrick_Out 373 363 10 416 416 13 30% 13 30% 16 60% Kendrick Reservoir - In Kendrick 373 363 225 416 416 347 54% 235 4% 281 25% Smith Reservoir - Out Smith_Out 255 245 19 251 251 19 0% 19 0% 19 0% Smith Reservoir - In Smith 255 245 375 251 251 694 85% 376 0% 510 36% North Sanderson Gulch Confluence with Sanderson Gulch 1201 863 857 1250 748 748 1392 11% 1166 -7% 1440 15% S Pierce Street 1202 728 718 1100 699 699 1345 22% 1110 1% 1364 24% Wadsworth Blvd. 1205 408 406 680 384 384 725 7% 676 -1% 835 23% Florida Avenue 1206 298 296 480 277 277 509 6% 478 0% 605 26% Green Gables Park 1208T 136 125 220 113 113 230 5% 218 -1% 234 6% 1 Tributary areas were reported in the data input sheets of the 1972 Sanderson MDP. 2 Tributary area includes sub-basins 119, 120, 121(Federal and Jewell), 137(Harvey Park), 138, 139(Ward Reservoir #5), and 156(Ward Reservoir #1) which were included in the 1972 MDP basin boundary, but were excluded from hydrologic modeling. 3 Tributary area excludes 119, 120, 121, 122, 123 (Federal and Jewell), 137(Harvey Park), 138, 139(Ward Reservoir #5), and 156(Ward Reservoir #1). 4 North Sanderson Gulch (N.S.G.) Design Points Reported Tributary Area (acre) 1 1972 MDP New Mapping Updated Tributary Area (acre) CUHP 2005_SWMM 5.0.0.22 Model Output (cfs) Tributary Peak Flow Calibrated Peak Entire Area (acre) 1972 2-hour Rainfall Flow 1972 2-hour % % Tributary Excluding (I = 2.0 to 2.26 in/hr) Rainfall (I = 2.0 to Difference Difference Area Split Flow & Distribution w/o 2.26 in/hr) & (B) to (A) (C) to (A) (acre) 2 and Calibration (cfs) Distribution (cfs) (A) Retention 3 (B) (C) (D) 2012 MDP % Difference (D) to (A) Note
Sanderson Gulch Major Drainageway Plan Baseline Hydrology Report October 2012 4.0 REFERENCES Boyle Engineering Corporation, Record Drawing, Sanderson Gulch Reach S-8. June 25, 1999. City and County of Denver, City and County of Denver Storm Drainage Design & Technical Criteria, January 2006. City of Lakewood, Storm Drainage Criteria Manual, August 9, 1982. DTJ Design, Inc., Green Gables Official Development Plan. Revised April 11, 2012. Federal Emergency Management Agency, LOMR Case No. 03-08-0090P Frasier & Gingery, Inc., Major Drainageway Planning, Sanderson Gulch/Weir Gulch. 1972. Frasier & Gingery, Inc., As Constructed Drawing, Sanderson Gulch Drainage Improvement HUD Project No. WSF-CO-08-00-0157. September 1978. Gingery Associates, Inc., Flood Hazard Area Delineation, Sanderson Gulch and North Sanderson Gulch. August 1979. Greenway Foundation, River South Master Plan (2009). Guo, James C.Y. Modeling Consistency for Integrated Watershed Management Approach Adopted in Denver Metropolitan Area, Colorado, 2008. Icon Engineering, Inc., Sanderson Gulch Drop Structure Inventory and Bank Stabilization, South Platte River to Sheridan Boulevard, Engineering Assessment and Maintenance master Plan, January 2002. Matrix Design Group, Inc., Construction Drawings for Sanderson Gulch Drainage Improvements at Florida, 2004. Matrix Design Group, Inc., Construction Drawings for Sanderson Gulch Channel Improvements W. Florida Avenue to S. Zuni Street, March 2012. Matrix Design Group, Inc., City & County of Denver Storm Drainage Master Plan, June 2009 Matrix Design Group Inc., Gulch Master Plan, Denver Parks and Recreation, October 2009. Matrix Design Group Inc., Final DRAFT Mississippi Gulch Outfall Alternatives Analysis and Scoping Study, December 2010. Urban Drainage and Flood Control District. Urban Storm Drainage Criteria Manual. Revised April 2008. Urban Drainage and Flood Control District. Colorado Urban Hydrograph Procedure, Version 1.3.3. 2005. U.S. Environmental Protection Agency. Storm Water Management Model, Version 5.0.020. March 2008. 33
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