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

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Sanderson Gulch Major Drainageway Plan Baseline Hydrology Report October 2012 Reach 6 – Sheridan Boulevard to Confluence with North Sanderson Gulch (Lakewood) Maintenance. Through the privately owned Bit-O-Sea reach, the adjacent homeowners associations are responsible for the maintenance of the drainageway. The improved drainageway for the White Fence Farm Filing 1 through the Wilson Family Park and Clairefield Reservoir area is eligible for UDFCD maintenance. Parks and Recreation. The Wilson Family Park is comprised of 13.16 acres, of which 1.62 acres are devoted to the permanent pool of the reservoir, based on GIS data. The park is predominantly non-irrigated natural area, with the bike/pedestrian path on the north side of the channel/ reservoir, connecting with S. Manor Lane and crossing S. Harlan Circle at grade. Water Quality/Detention. The opportunity for water quality treatment in Reach 6 is within the Clairefield Reservoir which already serves as detention. A major storm drain tributary inflow crosses under Jewell Avenue to discharge down a grouted boulder rundown into Clairefield Reservoir. The future ballfields area in Wilson Family Park could potentially be graded lower to be within the floodplain and provide some additional peak shaving detention opportunities in a major event. Reach 6 extends approximately 3,500 feet upstream of Sheridan Boulevard through open space and a series of three ponds to S. Harlan Drive where it re-enters a narrow, constructed drainageway. The Bit-O-Sea Reservoir is privately owned and has no public or maintenance access. Upstream of Bit-O-Sea Reservoir is Clairefield Reservoir and the Wilson Family Park, which is within the City of Lakewood open space. This public area has a broad floodplain and more natural channel conditions without hardened banks or structures and little incision. There is a gravel trail adjacent to the gulch through the open space which serves the Wilson Family Park and Clairefield Reservoir. The broad floodplain and ponds offer unique opportunities in this reach. Wilson Family Park at S. Harlan Circle. This area has been improved and includes a recent LOMR. The two road crossings within this reach. The Sheridan Boulevard crossing has approximately 10-year capacity. The Manor Lane has 100-year capacity. Drop structures exist only at the outlets of Clairefield and Bit-O-Sea Reservoir. The Clairefield outlet drop structure is in good condition. The Bit-O-Sea outlet drop structure is privately owned and its current condition is unknown. Landscape and Ecology. Wilson Family Park has a large open water body in addition to a large native open space area. The gulch is heavily lined with riparian species of willows and cottonwoods. The upland portion of the park is non-irrigated dryland grasses consisting of grama, wheatgrass, dropseed, and fescue species. Shrub species include Green rabbitbrush and sage species. The short distance to the confluence of North Sanderson Gulch is heavily vegetated with riparian species of cottonwood and willows through a series of ponds west of the east loop of S. Harlan Circle. Invasive species (thistle, kochia, smartweed, bindweed, prickly lettuce, common mallow, barnyard grass, Johnsongrass, pigweed, rag weed, halogeton, redstem filaree, alfalfa, Siberian elm, Chinese elm and the occasional Russian olive and curly dock) are present along the channel as well as in the upland grass areas. Reach 7 – North Sanderson Gulch Confluence to Green Gables Entrance Road (Lakewood) Reach 7 is approximately 2,000 feet in length and extends from S. Harlan Circle to the privately owned Shwayder Pond at the Green Gables entrance road. Except for Shwayder Pond, the reach is contained in a narrow constructed drainageway. A public trail along the gulch exists only downstream of W. Jewell Avenue and there is little opportunity to continue it upstream because of private property ownership. The entire reach has been stabilized and the existing channel and facilities are generally in good condition. There is currently little need for further improvements. Road crossings consist of W. Harlan Circle, W. Jewell Avenue and the privately owned W. Lake Drive gated community entrance. All three of these crossings have 100- year capacity. Three grouted rock drop structures exist in the reach, all of which are relatively new and in good condition. The reach also contains the confluence with North Sanderson Gulch located between S. Harlan Circle and W. Jewell Avenue. 8
Sanderson Gulch Major Drainageway Plan Baseline Hydrology Report October 2012 Landscape and Ecology. Upstream of the confluence with North Sanderson Gulch, the Sanderson Gulch mainstem turns south and crosses W. Jewell Avenue underground. The gulch as it parallels W. Jewell Avenue is linear in nature with occasional concrete curbs directing the flow of the trickle channel being released from the irrigation pond upstream. Vegetation adjacent to the channel is a fescue type grass with invasive species (barnyard grass, Johnsongrass, prickly lettuce, and curly dock) throughout. Maintenance. The property owners and the adjacent homeowners associations are responsible for the maintenance of the drainageway through this reach. A short reach on each side of S. Lake Road is maintained by UDFCD. UDFCD checks the system for functionality and maintains flood conveyance capacity through this reach. Parks and Recreation. The area downstream of W. Jewell Avenue to S. Harlan Circle, including the confluence with North Sanderson Gulch, is designated as the Sanderson Gulch Greenbelt and is Lakewood public open space. The concrete public trail provides public and maintenance access through this natural area to both north and south sides of the channel in this segment, which also includes a series of small ponds below the confluence. Water Quality. There are public storm systems in Jewell Avenue that discharge into Reach 7 of Sanderson Gulch. There is little public ground within this reach for water quality treatment. Most opportunities for water quality treatment exist on the private land and the privately owned Shwayder Pond, but would require agreements for such use. Reach 8 – Green Gables Country Club (Jefferson County) uses. Current plans show Sanderson Gulch through the site as an open channel within an open space corridor. There are two proposed 100-year capacity road crossings within the site development. Proposed plans for redevelopment have been incorporated into this study. Landscape and Ecology. The existing vegetative species are manicured irrigated turf type grass species. Occasional mature cottonwood trees line the channel. Approximately 700 lineal feet of the gulch is currently piped through this section. Weed species are minimal through this reach. Maintenance. This reach is currently privately maintained. Maintenance practices are a typical golf course regime of closely mown, highly fertilized, irrigated turf grass. It appears that these practices occur right to the edge of the gulch boundaries. When the site is redeveloped, the channel will be eligible for UDFCD maintenance. Parks and Recreation. The proposed Official Development Plan (ODP) states that the Sanderson Gulch drainageway and associated floodplain will be a large open space area comprised of natural and landscape areas with a public trail corridor, with eight foot trail traversing the site from west to east. The ODP includes 31.23 acres of public and private open space, predominantly located along Sanderson Gulch and a tributary from the south. The majority of Sanderson Gulch will be returned to a natural condition and designed to minimize erosion, maintain or improve stormwater management and enhance and maximize on-site aquatic resources. Trails, recreation areas, detention and natural areas and passive open space may be integrated within this area. Water Quality. There are two water feature ponds within the existing golf course. As with any golf course, there are always concerns about fertilizers and herbicides reaching the waterway. When the site is redeveloped, the improved Green Gables Entrance Road detention pond may also serve to improve water quality. Reach 9 –S. Wadsworth Blvd. to S. Allison Street (Lakewood) This section traverses through the existing Green Gables Golf Course. Reach 8 and the entire 152-acre Green Gables Country Club are currently within the jurisdiction of Jefferson County. In 2011, the Country Club closed its operations and was sold for redevelopment. Rezoning and redevelopment of the site is currently underway to change the land use into a planned development of mixed commercial and residential 9
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