Phase A - Alternatives Analysis Report - Urban Drainage and Flood ...

PHASE A – ALTERNATIVES ANALYSIS REPORTMajor Drainageway Planning Update for Hidden Lake-Bates LakeBates Lake WatershedReach B-1: Watershed Headwaters to Railroad Tracks at Sheridan Boulevard1. Do Nothing2. Regional Detentiona. Improve the inlet pipes to Bates Lake / Homestead Park to discharge to the surface.Construct a formal outlet for Bates Lake.b. Construct a regional detention basin north of the railroad tracks at the extension of Depew St.(Possible conflict with Gold Line)3. Improved Conveyancea. Upsize the pipe under the railroad tracks along the extension of Depew St.b. Upsize the pipe under the railroad tracks to Clear Creek along Sheridan Blvd.4. Water Qualitya. Incorporate water quality into Bates Lake / Homestead Park.b. Build an end of the pipe water quality basin east of Sheridan Blvd.Reach B-2: Along Railroad Tracks from Sheridan Boulevard to Tennyson Street1. Do Nothing2. Improved Conveyancea. Improved channel north of the railroad tracks. Possible conflict with Gold Line.b. Construct a direct pipe connection under Tennyson St. to James Baker Reservoir.5. Action Itemsa. Arvada/Westminster/Adams Co. to provide mailing address list for public meeting notificationb. Matrix to secure location for the first public meetingc. UDFCD to send out public meeting announcement at least one week before the meetingd. Matrix to incorporate hydrology comments and revise reporte. UDFCD to provide Matrix an updated CUHP 2005 model version to re-run the hydrologyf. Matrix to evaluate condition of existing 96” CMP along Lowell Blvdg. Matrix to complete benefit/cost analysis for best alternatives for the six reaches identifiedh. Matrix to check HEC-RAS model for starting water surface conditions