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I I I II I I I I I I I II II I I I II II II Lower Big Dry Creek Hydrologic Study 5.3.2 Broomfield and Vicinity Outfall Systems PlanninQ Studies The Broomfield and Vicinity Outfall Systems Planning Report (Kiowa 1999) area included four major drainageways trilbutary to Big Dry Creek: the City Park Drainageway, Drainageway 3207, Quail Creek and McKay Lake. A small area called Windmill Creek was also included in the study. All of these basins are west bank tributaries to Big Dry Creek. This study updated most of the earlier Greenhome and O'Mara (1985) plan. Key recommendations of this report for each drainageway included: . City Park: Removal of structures from the 100-year floodplain, conveyance improvements, and formalization of inadvertent detention upstream of Highway 36. The plan also recognized several existing detention facilities. . 3207 Drainageway: The seven existing detention facilities in this drainageway were identified as functioning effectively to reduce peak flows. . Quail Creek: Improving conveyance, incorporating 175 acre-feet of storage at Plaster Reservoir (in the Broad1ands development) and providing 100-year crossings for major transportation arteries. . McKay Lake: Improving conveyance and formalizing 97 acre-feet of detention at McKay Lake. . Windmill Tributary: No changes were noted for this small tributary. Two watersheds in the Greenhorn and O'Mara report were not updated by Kiowa (1999). These two drainages included the Gay Reservoir and West Lake sub-basins. The focus of the Gay Reservoir basin was improvements to the existing Le Gault and Tom Frost Reservoirs to provide flood control benefits. 5.3.3 Outfall Systems Plan North Area Tributaries (ADCO) Continuing downstream, WWE (1989b) completed the Outfall Systems Planning North Area Tributaries Big Dry Creek (ADCO) for the 18.7-square-mile area from 144th Avenue to the 971-179.092 June 2005 Wright Water Engineers, Inc. Page 36