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I I I I I I I I I I I I I I I I I I I 2 bination of channels as proposed in Alternative 2 appeared to be the most applicable solution to future drainage problems in the basin. Alternative 2 recommendations included: (1) a 10-year capacity chan- nel through Bear Creek Park; (2) modification of the existing culverts under Kenyon Avenue; (3) no improvements from Kenyon Avenue to Incinerator Lake; (4) increase in the capacity of the existing culvert under Sheridan Boulevard; (5) protection of the embankments of the three lakes in Pinehurst Golf Course with buried riprap; (6) 100-year capacity channels and culverts from Quincy Avenue to the east boundary of Parkwest 3 subdivision; and (7) provision of a settling basin west of Colorado State Highway 121 or the Marston Sump. should be designed using the standard Curb-Opening Inlet Chart in the June, 1977, issue of "Flood Hazard News". Major Drainageway Plan Improvements The recommended plan utilizes grass-lined channels, concrete-lined channels, concrete box culverts, corrugated metal pipes, and a sedi- ment settling pond. All master plan improvements are designed for future basin development conditions. The improvements include: 1. Upgrading of the culvert under the paved path in Bear Creek Park. The Phase A report on Major Drainageway Planning for Marston Lake North has been reviewed by the Urban Drainage and Flood Control District, City and County of Denver, and Denver Water Department. The recommended alternative plan was accepted by all jurisdictions with the following comments: 2. A grass-lined channel with 10-year design capacity from Bear Creek to Kenyon Avenue. 3. Upgrading of the culvert under Kenyon Avenue. 1. A culvert sufficient to carry rOO-year flood shall be pro- vided at Sheridan Boulevard. 4. Upgrading of the Incinerator Lake Reservoir. 5. A bridge with 100-year design capacity at Sheridan Boulevard. 2. Proposed channel improvements through Bear Creek Park should be coordinated with the Denver Parks and Recreation Department. 6. Floodplain delineation of the Pinehurst Golf Course. 3. Provide flow separation structures at all irrigation ditches. 7. Upgrading of the embankment of three lakes in the Pinehurst Golf Course with buried riprap. 4. Provide appropriate maintenance access to all improvements and open channel reaches. 8. Four arch pipes for low flows (5-year capacity) at Quincy Avenue. 5. Provide velocity control structures where excessive veloci- ties and/or sustained low flows would cause channel side slo- pes to erode and/or the stream bed to degrade. 9. A grass-lined channel with 100-year design capacity from Quincy Avenue to the Marston Lake caretaker's house access. 10. An arch pipe with 100-year design capacity at the Marston Lake caretaker's house access. 6. Any storm sewer inlets to be provided in conjunction with the recommended and/or sel ected improvements shoul d be "Type R" as designated by the Colorado Department of Highways and 11. A low flow diversion structure with control gate near the Marston Lake caretaker's house access for Fort Logan lateral.