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<br />Expansion oNx1~ting
<br />Facilities
<br />(Alternative II-D)
<br />
<br />The expansion of Carter Lake and
<br />Horsetooth Reservoir was evalua ted
<br />in this preliminary analysis. These
<br />two reservoirs are part of the Color-
<br />ado-Big Thompson Project operated
<br />by the U.S. Bureau of Reclamation.
<br />The present storage capacity of Carter
<br />Lake is 112,000 acre-feet. and the
<br />expansion of the reservoir could pro-
<br />vide an additional 24.000 acre-feet
<br />of storage. The present storage ca-
<br />pacity of Horsetooth Reservoir is
<br />143.000 acre-feet. This reservoir
<br />could be expanded by an additional
<br />42,000 acre-feel.
<br />
<br />Supply
<br />
<br />The average dependable municipal
<br />wa ter supply provided by the design
<br />project would be 11,700 acre-feet.
<br />The return flows from the municipal
<br />use of the additional water would be
<br />7.800 acre-feet annually, Agricul-
<br />tural reuse of return flows four limes
<br />downstream would provide an addi-
<br />tional 2.900 acre-feet of irrigation
<br />water deliveries.
<br />
<br />Costs
<br />
<br />The 1980 cost estimate for construc-
<br />tion of the design project is $41
<br />million, The interest cosl during con-
<br />struction would be $17 million, The
<br />annual costs have not been estimated
<br />for this alternative because the facil-
<br />ities in question are now being oper-
<br />ated and maintained.
<br />
<br />Impacts
<br />
<br />The investment required would total
<br />$58 million in construction costs and
<br />interest during construction. The net
<br />economic benefit would be .$16 mil-
<br />lion, The estimated impacts associ-
<br />ated with fish and wildlife would
<br />represent a moderate positive change
<br />from existing conditions.
<br />
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