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<br />2323 <br /> <br />'. <br /> <br />" <br /> <br />" <br />, <br /> <br />The fiGure in no ~~ represents or reflects prospective water <br />cha~ges for either irrigation or municipal use. Such charges 'Qll <br />be determined by additional studies to be "Jade as the investigation <br />:progresses. <br /> <br />In .chis repo:ct the potential inflow available for storaGe at the <br />Narrows and "!eld County si.ces are assumed to be the sar,le. Ho;rever, <br />Weld County Reservoir would provide opportunity to save evaporation <br />losses of about 11,000 acre-feet annually by consolidation of <br />Empire and Riverside storages. Against this gain the Held County <br />Reservoir ;rould have a lar::;er surface area than Narrools resulting <br />in greater evaporation; hence, it is estimated that net annual <br />yield from evapora-cion savings of Empire and Riverside water stored <br />in Held County Reservoir might average 5,000 acre-feet per year. <br /> <br />There ;rould be negligible ;rater use benefits from diverting Bijou <br />water into the Narrows Reservoir and from Higgins Reservoir since <br />in most instances, the Bijou flows must be bypassed for downstrewn <br />appropriator::;, <br /> <br />Tentative annual water supply benefits are $1,300,000 at the Narro',s <br />site and $1,365,000 at Weld County site. <br /> <br />...~, <br /> <br />~ <br /> <br />f,l <br /> <br />Construction costs estimated from preliminary data have been cited <br />previously in this report. In addition to the capital costs of <br />,-rorks, the annual o~ceration, maintenance and replacemen.c costs r:i: <br />the various features are an essential component of benefit-cost <br />analysis. These annual OM&R costs also are of reconnaissance grade. <br />A SUlllIllary of construction costs and Ol-rdl cos.cs is sho,m in Table 7. <br /> <br />Interest During Construction <br /> <br />Interest during construction is an econonuc cost representing the <br />use of Federal funds during the period of construction of the worl,s. <br />When construction is completed, the features become benefit-producing. <br />The total investment in the works consisting of construction cost <br />and interest during construction is converted to an annual e'luivalent <br />cost for comparison with atlnluU benefits, In determining interest <br />during construction the long-term Federal interest rate of 2* <br />percent is used, and the construction period of the 'lorI,s is" estimated <br />to l~ five years. <br /> <br />", <br /> <br />'. <br /> <br />15 <br />