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<br />. <br /> <br />River flood control channel in Arapahoe County. It forms an integral pan of the central spine of the Denver metro <br /> <br />area greenway system and is enjoyed by more than 700.000 users annually. <br /> <br />Multiple Use Detention Facilities. South Suburban. the Urban Drainage and Flood control District and local <br /> <br />municipalities combined effons and funds to develop two significant multiple use flood storage facilities. Park and <br /> <br /> <br />trail development within these normally dry flood storage facilities enables recreational use during non-flood periods. <br /> <br /> <br />Holly Park was developed in the flood pool zone behind Holly Dam on Little Dry Creek in Arapahoe County. The <br />4O-acre park features a playground, open space and a multi-level tennis complex, with the lowest courtS at the lO-year <br /> <br />flood elevation. The Willow Sarin. Open Soace Park is a 122-acre natural open space within the flood pool zone <br /> <br />behind Englewood Dam on Willow Creek in Arapahoe County. South Suburban has preserved the wetlands and <br /> <br />wildlife habitat. and, with suppon of neighboring residents. has developed a peripheral trail system and is planning <br /> <br />a nature center. <br /> <br />Multiple Use Greenwavs. McLaughlin Water Engineers (MWE) has worked with South Suburban on the design of <br /> <br />trails. stream crossings and channel stabilization improvements for over 16 years. The design team has successfully <br /> <br /> <br />. completed numerous projects within challenging and often constrained floodplain! floodway corridors through <br /> <br /> <br />innovative design and hydraulic analysis. For example. low water trail crossings are fined with handrails that collapse <br /> <br /> <br />under high water and debris loading to minimize upstream flood impacts. Where larger bridges cannot practically be <br /> <br /> <br />designed to span the loo-year floodplain. a breakaway bridge design is employed to confonn with 'no-rise" floodplain <br /> <br /> <br />regulations. Channel stabilization measures are often included with greenway trail designs, including check structures <br /> <br /> <br />for gradient control and bioengineered bank protection measures. Greenway trail designs typically focus on two main <br /> <br /> <br />Objectives; (I) no net fill within the floodplain so that the loo-year water surface prome is unaffected, and (2) route <br /> <br /> <br />selection that minimizes impacts to stream riparian zones and habitat. South Suburban has been fonunate to be able <br /> <br /> <br />to share funding and maintenance with the Urban Drainage and Flood Control district and the local municipality on <br /> <br /> <br />virtually every greenway trail completed to date, which illustrateS a key benefit to multiple use greenway development. <br /> <br />Summary <br /> <br />. <br /> <br />The South Suburban Park and Recreation District is proud of its system of parks, greenways and other <br /> <br /> <br />recreational facilities. many of which also serve as flood control facilities and floodways, Primary elements for a <br /> <br /> <br />successful multiple use park or greenway project include; a specific planning and design process that emphasizes <br />