Laserfiche WebLink
<br />Tributary Unit Accounting Procedure <br />. , <br /> <br />Sinoe all tributary Units do not hS.ve. the same physical and <br />hydrologic characteristics, the accounting procedure is discussed for <br />each tributary unit separately in the following paragraphs. <br /> <br />These procedures, including supplemental computations of <br />return flows and channel losses, are proposed to account for use of <br />water on old lands and new lands from natural flow and from storage , <br />and the increases or decreases in Rio Grande flows as a result of the <br />changed condition due to project operations. <br /> <br />Cerro Ulalt, The Cerro Unit will contain both presently <br />. irrigated and new land. The plan proposes that some new irrigable <br />land should replace class 6 land presently irrigated in the Cabresto <br />Creek-Red River area. <br /> <br />Under present conditions, water for irrigation is diverted <br />from Red River, Cabresto Creek, La.tir Clreek, Rio Primero,and Rio Medio.. <br />Conditions are such that there are no significant diversions of return <br />flow for reuse. <br /> <br />Under project conditions, the natureJ. flO'W of Red River and <br />storage releases from Zwergle Reservoir ,will be diverted through the <br />Sunshine Valley Canal. The natural flows of Cabresto Creek and stored <br />water fran Cabresto Lake will be diverted tbroogh this ca.nal and the <br />existing Llano Canal. Tb.e natural flows of La.tir Creek will be diverted <br />tllrough the Le.tir Canal which will replace the existing Cerro COlllIll1.U1ity <br />Ditch. Diversions will continue to be made from Rio Primero and Rio <br />Medio as at present. The total of the, diversions for this unit will be <br />determined. There will be no significant rediversion of return flows . <br /> <br />For accounting purposes, it is assumed that as required and <br />to the extent available, direct diversions of natural flow will be used <br />first to meet irr:l.gation requirements on presently irrigated lands, and <br />then on newly irrigated lands. Stored water would be used to supplement <br />the natural flow diversions to both old and new lands. The area of old <br />irr1gat:l.on, inclulHng the new irr:l./ilated area. in the Sunshine Valley that <br />may replace class 6 land in the Red River-Cabresto area, and the area of <br />new land to be served, will be defined. If on any day the direct natural <br />now diversions are adequate for a:u lands, the water would be prorated <br />between the old and new lands, based on their relative acreage. When <br />storage is used to augment the direct natureJ. flow diversions, the total <br />diversions for that day would be prorated between the old and. new lands <br />with the assumption thS.t natureJ. flow diversions are used on the old <br />lands first. <br /> <br />An example is used to illustrate the methoQ.. For simplicity, <br />it is assumed that the unit is composed of 10,000 acres, with 5,000 <br />acres of old J.ands and 5 J 000 acres of new:,lands, and that 100 c.f. s . <br />is the daily diversion. <br /> <br />21 <br /> <br />Re:v. 2/25/63 <br />