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<br />CHAPTER IV <br /> <br />ALTERNATIVES <br /> <br />. <br /> <br />t..) <br />:.., <br />o <br />o <br /> <br />A system of header pipes and manholes would be installed to connect <br />the collection systems with the conveyance pipeline. Water collected <br />from the springs would flow by gravity into a header pipe, while water <br />from the wells would be pumped into the system. Manholes on the pipe- <br />line would collect the water from the headers. Flow wouln be by gravity <br />to the last manhole of the header system which would be desiRned to ini- <br />tiate pressure flow in the pipeline at that point. Pressure flow wouln <br />then exist in the remainder of the pipeline. <br /> <br />The header system would consist of fiberj.'(lass pipe ranginj.'( from <br />6 to 22 inches in diameter. Pipe size would be based on maintaining <br />a velocity of 2 feet per second and handlin~ design flows 20 percent <br />greater than the average flow to accommodate peak flows, Standarrl pre- <br />cast manholes would be installed and lined with cement mortar, <br /> <br />A river crossing would be required to connect Dot 9, 10, and 11 to <br />the conveyance pipeline. The crossing would consist of a 22-inch fiber- <br />glass pipe enclosed in a larger pipe and buried under the river, <br /> <br />. <br /> <br />In the Glenwood Springs area, a total flo.... of 9.7 cfs of saline <br />water with an average salinity of 18,400 mg/L would be collected. Ap- <br />proximately 9,2 ds would be collected from 9 of the 12 identified <br />springs, and 0.5 cfs would be collected by pumping saline ground water <br />flows from wells in the area of the remaining surface springs. <br /> <br />Flows from Glen SO and 60 wouln be collected using surface diver- <br />sion spring boxes as discussed previously. The spring boxes would be <br />precast concrete vaults with a PVC gravity outlet line and a I"lanhole <br />access. Emergency PVC outlet lines would also be used to allow mainte- <br />nance of the conveyance pipeline. These sprin~s are located at a suf- <br />ficient elevation above the Colorado River to preclude the need for pro- <br />tective dikes. Approximately 0.1 cfs would be collected from Glen SO <br />and 3.2 cis would be collected from Glen 60. <br /> <br />Flows of Glen 10, 12, 20, 30-40, 70, 90. and 100 would be collected <br />utilizing spring boxes on the bank of the Colorado River. Flows would <br />be routed through a header pipe system to pump stations that would lift <br />the water into the pipeline. \.o'hen the pipeline was being serviced, the <br />flow from the spring boxes would continue to discharge to the pumps <br />when!' the water would return to the river through an overflow pipe. Im- <br />permeable concrete retainer walls would be constructed at an elevation <br />sufficient to protect the collection facilities from hi~h flows of the <br />Colorado River. The flow collected would consist of 0.4 cfs from Glen <br />10. 0.2 cfs from Glen 12. 0.7 cfs from Glen 20, 0.6 cfs from Glen 30-40, <br />3.3 cfs from Glen 70, 0.2 cfs from Glen 90, and 0.5 cfs from Glen 100. <br /> <br />. <br /> <br />At Glenwood Springs a well field consisting of five n-inch wells <br />drilled to a depth of 45 feet would collect subsurface flows. Five 2-hp <br />pumps would collect Ii total of 0.5 cfs of water. The collection system <br />would require about 61,000 kWh of energy annually. <br /> <br />22 <br />