Overview of Qualifications: Water Resouce Planning Services Apr 2003

Home Browse Search

Sample Water Resources Projects - Continued and a gravity flume connecting the two reservoirs. The 80 -year old flume crosses rough terrain and has presented both maintenance and potential liability problems. Boyle evaluated modifications to both dams. The Lake Hodges outlet will be enlarged and upgraded. The San Dieguito Dam outlet will be replaced with a new multi -level outlet system. Boyle also developed a hydrologic model of the system to test yield of improved storage under different sizes and configurations of a new pipe or flume. Flow tests and hydraulic analysis of the flume were conducted, and options for both partial and complete rehabilitation were investigated. These were compared with several options and the flume will be replaced with a 5- mile -long pressure pipeline. Another component of the project was analysis of opportunities for improving usable storage of the reservoir through dredging, vegetation removal, and lowering the outlet works. Water quality improvements were also addressed, both through a vegetation management plan, and conceptual design of a system to intercept poor quality urban runoff that currently enters the reservoir. A biological assessment was conducted to identify environmentally related constraints and opportunities associated with all aspects of the project. Wolford Mountain Project Since 1972, the Colorado River Water Conservation District (CRWCD) had worked toward building a dam on Colorado's West Slope. CRWCD's goal was met with construction of the $47- million Wolford Mountain Project, designed by Boyle Engineering Corporation in association with Harza Engineering Company. Located five miles north of the town of Kremmling in Colorado's Middle Park region, the Wolford Mountain Project features Ritschard Dam, Wolford Mountain Reservoir, and Wolford Mountain Recreation Area. The reservoir is designed to store 66,000 acre -feet of water on Muddy Creek, a tributary to the Colorado River. The 135 -foot high zoned embankment dam has a 2,600- foot -long crest and two spillways to convey flood waters safely past the dam. The service spillway, a conventional ogee crest and concrete -lined channel, is designed to pass the 100 -year flood. An adjacent emergency spillway, together with the service spillway, will pass larger floods up to the probable maximum flood. The outlet works intake structure is a 120- foot -high tower with four gates at different elevations to allow selective withdrawal of reservoir water. The ability to select the quality of reservoir water released will enhance the water quality of the tailwater fishery below the dam. Selective withdrawal gates can be operated to limit velocities through the trash racks to five feet per second, reducing loss of fish from the reservoir. The outlet works piping features a 54 -inch fixed -cone valve and a 30 -inch sleeve valve. The separate low -flow outlet can discharge into the atmosphere, aerating the creek - , 6 - F3OVLE