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

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Sanderson Gulch Major Drainageway Plan Baseline Hydrology Report October 2012 River Station Drop # Drop Type Table 2-3 Existing Drop Structure Inventory Drop Height (ft) Condition Rating Safety Hazard Concern Location Notes 18+40 1 Vertical Concrete 5 Good X S Navajo St. 32+00 2 Steep Grouted 4.1 Fair X 34+70 3 Grouted Rock 1.5’+/- Good 37+90 4 Grouted Rock 2’+/- Fair 42+50 5 Grouted Sloping Boulders 3.68 Good W. Florida Ave. D/S 44+00 6 Stepped Blocks 5.46 Good X W. Florida Ave. U/S 50+50 7 54+00 8 55+20 9 Ungrouted Boulders and Vegetated Face Ungrouted Boulders and Vegetated Face Ungrouted Boulders and Vegetated Face 2.3 2.3 2.3 Good (new 2012) Good (new 2012) Good (new 2012) 64+50 10 Steep Grouted 4.3 Good X S Zuni St. 80+50 11 Sloping Grouted 3 84+50 12 Sloping Grouted 2 Good (New 2001) Good (new 2001) 95+20 13 Vertical Grouted 2.4 Fair Approxi. 400 feet U/S Clay St. S. Decatur St. Approxi. 450 feet U/S Federal Blvd. 107+50 14 Vertical Gunite Gabions 3.4 Poor X S Java Way 126+00 15 Vertical Gunite Gabions 4.5 Poor X S Michigan St. 133+00 16 Vertical Gunite Gabions 3.5 Poor X S Newton St. 141+00 17 Rock Drop 1’+/- Fair X 163+50 18 Vertical Gunite Gabions 4 Fair X S Winona St. 172+00 19 Vertical Gunite Gabions 5 Fair X S Xavier St. 185+00 20 Loose Riprap 8.5 Bit-O-Sea Outlet 197+00 21 Grouted Boulders 2.4 Good Manor Lane 210+00 22 Grouted Boulders 4.5 Good S. Harlan Circle 222+00 23 Grouted Boulders 4 Good Approxi. 300 feet D/S S Lake Rd. 228+00 24 Grouted Boulders 5 Good Shwayder Pond Outlet 287+80 25 Concrete/Gabions 1’+/- Poor River Station Drop # Drop Type Drop Height (ft) Condition Rating 289+50 26 Concrete/Gabions 1’+/- Poor 294+50 27 Concrete/Gabions 1’+/- Poor 296+70 28 Concrete/Gabions 1’+/- Poor 299+50 29 Concrete/Gabions 1’+/- Poor 302+50 30 Concrete/Gabions 1’+/- Poor 304+80 31 Concrete/Gabions 1’+/- Poor 306+20 32 Concrete/Gabions 1’+/- Poor 309+30 33 Concrete/Gabions 1’+/- Poor 311+00 34 Concrete/Gabions 1’+/- Poor 312+00 35 Concrete Baffle Block 3.5 Good North Sanderson Gulch Safety Hazard Concern Location Notes Jewell Park Pond Outlet 1+80 1 Grouted Sloping Boulders 5.6 Good White Fence Farm Filing No. 1 5+50 2 Grouted Sloping Boulders 4.3 Good White Fence Farm Filing No. 1 7+20 3 Grouted Sloping Boulders 4.4 Good White Fence Farm Filing No. 1 8+70 4 Grouted Sloping Boulders 3.6 Good White Fence Farm Filing No. 1 12+00 5 Grouted Sloping Boulders TBD Good White Fence Farm Filing No. 1 14+00 6 Grouted Sloping Boulders 2.92 Good Greenbelt Improvement 16+70 7 Grouted Sloping Boulders 3.17 Good Greenbelt Improvement 20+00 8 Grouted Sloping Boulders 3.42 Good Greenbelt Improvement 24+70 9 Grouted Sloping Boulders 3’+/- Good Greenbelt Improvement 27+20 10 Grouted Sloping Boulders TBD Good Greenbelt Improvement 47+50 11 Vertical Concrete 3 Poor X North of Calahan 54+00 12 Stepped Concrete 2.5 Poor East of Wadsworth 56+00 13 Stepped Concrete 2.3 Poor East of Wadsworth 65+00 14 Vertical Concrete 2 Fair West of Wadsworth 73+50 15 Sloped Concrete 1’+/- Fair Allison St. Lakewood 77+00 16 Vertical Concrete/Gabions 2.5 Fair Balsam St. 16
Sanderson Gulch Major Drainageway Plan Baseline Hydrology Report October 2012 2.5 Flood History In 1958, the City & County of Denver initiated a floodplain zoning ordinance along Sanderson Gulch. This ordinance preserved the floodplain areas immediately adjacent to the Sanderson Gulch channel and has likely since played a major role in limiting flood damages along the Gulch. USGS Gage No. 06711600 (Sanderson Gulch Tributary at Lakewood, CO) is located near the near intersection of Wadsworth and Florida in the North Sanderson Gulch with drainage area 0.57 square miles. The peak flood event for the 33 year period of record occurred on June 6, 1977. Past flooding along Sanderson and North Sanderson Gulch is not well documented and historical stream gaging data is limited. No reports of flooding property have been reported. The 1979 report Flood Hazard Area Delineation, Sanderson Gulch & North Sanderson Gulch (Gingery Associates, Inc., 1979) stated that major flood events had not occurred in the past 20 years. Other flood events have undoubtedly occurred but the fact that little information on historical flooding can be found may be indicative of both a lack of major flood events and early floodplain management efforts. USGS Gage No. 06711609 (Sanderson Gulch at Navajo St. at Denver, CO) near the outfall to the South Platte River was in operation between 1987 and 1999. The gage was located upstream of the Mississippi Gulch storm drain outlet to Sanderson Gulch with drainage area 7.98 square miles, and is no longer active. During this 13 year period, the maximum peak discharge recorded was 1,230 cfs on July 25, 1998. This flow is only slightly greater than the hydrology computed in 1972 for a 5-year event, and therefore significant flood events did not occur during this period. 422 cfs North Sanderson Gulch 1972 hydrology 100-year = 680 cfs 1972 hydrology 10-year = 250 cfs 1972 hydrology100-year = 2,910 cfs 1972 hydrology 10-year = 1,900 cfs 1,230 cfs 17
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