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

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Sanderson Gulch Major Drainageway Plan Baseline Hydrology Report October 2012 Landscape and Ecology. Sanctuary Park and Robbins-Dasher Lake are at the headwaters of North Sanderson Gulch. This is a native wildlife habitat park which is dominated by riparian species of cottonwoods, willows, cattails and phragmites. Invasive species thistle, kochia, smartweed, bindweed, prickly lettuce, common mallow, barnyard grass, Johnsongrass, pigweed, rag weed, curly dock, alfalfa, Chinese elm, Siberian elm and Russian olive. Maintenance. Routine maintenance responsibilities of the pipe and city-owned park are performed by the City of Lakewood. Parks and Recreation. Public bicycle and pedestrian access along the piped segment is provided on-street and by attached sidewalks along W. Florida Avenue. Green Gables Park (11.82 acres) and Sanctuary Park (10.69 acres) are bisected by S. Garrison Street. Green Gables Park includes 0.63 acres of water surface in its pond, and also includes softball and soccer athletic fields, paved parking, playground and restroom facilities. Sanctuary Park includes a 3.09 acre pond and natural areas, and has a gravel trail with wildlife observation overlooks. Sanderson Gulch watershed at Jewell Park Pond. During a major storm, the open channel could fill with stormwater and be a potential import to Sanderson Gulch. However, with an emergency overflow located at Mississippi Avenue, the Weir Gulch watershed tributary basin to the Agricultural Ditch downstream of the spill is relatively minor and considered insignificant. 2.4.2 Ward Canal The Ward Canal, operated by the Ward Canal Company, supplies water to Kendrick Lake No. 1, Kendrick Lake, Smith Reservoir, Ward Reservoir No. 1 and Ward Reservoir No. 2 within the Sanderson Gulch watershed. The canal is open channel in some areas, but mostly piped underground through a majority of the reach in Sanderson Gulch. Because the canal is located along the ridgeline of the basin divide between Bear Creek and Sanderson Gulch, there is little area tributary to the canal. The amount of stormwater that could be imported or exported by the Ward Canal during a significant storm event is insignificant to the Sanderson Gulch major storm hydrology. Water Quality. Water quality treatment occurs within Sanctuary Park which acts as a 100-year retention pond. Passive water quality occurs within Robbins-Dasher Lake in Green Gables Park. 2.4 Irrigation Ditches Irrigation ditches are an important consideration for Major Drainageway Planning studies. In the past, it has been common practice to ignore irrigation ditches, assuming they are full and runoff simply flows across them. However, during a major storm event, these open channel ditches can import or export flow from a drainage basin which should be considered in the hydrologic model. Piped irrigation ditches are less of a concern regarding stormwater runoff interaction. Additionally, municipalities are attempting to disconnect urban storm drainage from the irrigation ditches for liability and water quality concerns. The Sanderson Gulch headwaters receive irrigation water from two major ditches as shown on Figure 2-4: • Agricultural Ditch which diverts water from Clear Creek • Ward Canal which diverts water from Bear Creek 2.4.1 Agricultural Ditch The Agricultural Ditch is operated by the Agricultural Ditch & Reservoir Company and also operates Smith Reservoir within the Sanderson Gulch drainage basin, and Main and East Reservoirs within the Weir Gulch drainage basin. The Agricultural Ditch is generally an open channel ditch which could have an interaction with surface stormwater runoff. It has emergency overflow spill points at Mississippi Avenue to discharge into Weir Gulch if necessary, and at Jewell Park Pond to discharge into Sanderson Gulch if necessary. Smith Reservoir has a 250 acre tributary basin, included the reservoir itself. Smith Reservoir is able to contain a 100-year storm event. However, during normal operations and in an emergency situation, Smith Reservoir can send water into East Reservoir. If East Reservoir were to spill, water would be intercepted by the Agricultural Ditch and conveyed into Sanderson Gulch to Jewell Park Pond to the emergency spill point. For the purposes of this study, the Agricultural Ditch is not expected to have an impact on major storm hydrology. If Smith Reservoir were to spill (potential export), this water would be returned back to the 14
Sanderson Gulch Major Drainageway Plan Baseline Hydrology Report October 2012 River Station Sanderson Gulch Table 2-2 Major Crossing Structure Inventory Location Reach Crossing Type Size Condition Capacity 0+00 S. Platte River Dr. S-1 Culvert 15’-4” x 9’-3” CMP Good < 10 yr 6+50 C&S Railroad S-1 Bridge 2 – 19’ x 5.5’ Open > 10 yr 9+00 S. Lipan St. S-1 Culvert 2 - 14’ x 6’ 9”’ RCB Good* > 10 yr 27+00 W. Arkansas Ave. S-2 Culvert 96” RCP + 120” x 78” HERCP 43+50 W. Florida Ave. S-2 Culvert 15’-4” x 9’-3” CMP < 10 yr 62+50 S. Zuni St. S-2 Culvert 2 – 12’ x 6’ RCB Good* > 10 yr 77+00 S. Clay St. S-3 Culvert 2 – 66” RCP < 10 yr 91+00 S. Federal Blvd. S-3 Culvert 2 – 10’ x 6’ RCB + 14’ x 8’ RCB 10 yr > 10 yr 104+50 S. Irving St. S-4 Culvert 2 – 10’ x 6’ RCB Good* < 10 yr 121+00 S. Lowell Blvd. S-4 Culvert 66” RCP < 10 yr 153+00 S. Tennyson St. S-4 Culvert 72” RCP < 10 yr 171+00 S. Xavier St. S-5 Culvert 2 – 78” RCP < 10 yr 181+00 Sheridan Blvd. S-6 Culvert 2 – 9.5’ x 5’ RCB 10 yr 197+00 S. Manor Ln. S-6 Bridge 210+50 S. Harlan Cir. S-6 Bridge 220+00 W Jewell Ave. S-7 Culvert 225+50 S. Lake St. S-7 Bridge 228+00 236+50 286+00 Shwayder Pond Outlet (Private) Green Gables Entrance Rd. W. Jewell Ave. S. Wadsworth Ave. 2 – 22.5’ x 5’ Openings 2 – 16’ x 6’-8” Openings 3 - RCB entrance and 3 - 60” RCP outlet 2 – 3’-9” x 14’ Openings 100 yr 100 yr 100 yr 100 yr S-7 Culvert 3 – 24” < 10 yr S-7 Culvert S-9 Culvert 8’ x 4’ + 24” RCP + 15” RCP 2 – 66” to 2 – 10’-5” x 4’ @ exit > 10 yr > 10 yr 289+00 S. Ammons St. S-10 Culvert 60” + 66” > 10 yr River Station Location Reach Crossing Type Size Condition Capacity 292+50 S. Balsam St. S-10 Culvert 60” + 66” > 10 yr 299+00 S. Carr St. S-10 Culvert 2 – 66” > 10 yr 302+00 S. Cody St. S-10 Culvert 2 – 66” > 10 yr 312+00 Jewell Park Pond Outlet S-10 318+00 Agricultural Ditch S-11 Bridge Over Spillway Low Flow Pipe + Overflow 24’ x 4’-9” Open 100 yr 24” RCP < 10 yr 326+50 S. Garrison St. S-11 Culvert 45” x 29” HERCP < 10 yr 339+50 Kendrick Res. Outlet North Sanderson Gulch S-11 Bridge Over Spillway 72’ x 6.8’ Open 100 yr 9+00 S. Harlan Cir. NS-1 Bridge 2 – 16’ x 5’ 100 yr 28+00 S. Pierce St. NS-2 Culvert 2 – 12’ x 3’ RCB > 10 yr 37+00 S. Quay Dr. NS-2 Culvert 2 – 8’ x 4’ RCB > 10 yr 43+00 S. Upham St. NS-2 Culvert 2 – 8’ x 4’ RCB > 10 yr 46+50 S. Calahan St. NS-2 Culvert 2 – 8’ x 5’ RCB > 10 yr 59+00 S. Wadsworth Blvd. NS-3 Culvert 2 – 8’ x 4’ RCB > 10 yr 74+00 S. Allison St. NS-3 Culvert 8’ x 5’ RCB > 10 yr Culvert/Bridge Condition Ratings: Good – No significant structural damage or degradation that would bring into question the structural integrity of the facility. Significant future service life is expected. Fair – Some damage or degradation to structural elements of the facility is evident. Structure is not in eminent danger of failure but repairs are required to ensure an extended future service life. Poor – Significant damage or degradation of structural elements of the facility is evident. Significant remedial work is required in the near future. Critical – Significant damage or degradation of structural elements of the facility is evident and at least partial failure appears possible during a large flood event. Major rehabilitation or complete replacement is required. Erosion Threat - In some cases channel invert and bank erosion can pose a threat to structures that are otherwise structurally sound. When this is the case, it is noted in parentheses. * Condition Rating from Kevin Rens, City & County of Denver, email dated 7/25/2012. 15
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