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<br />. <br /> <br />o <br />~ <br />C'l <br />C...\ <br /> <br />. <br /> <br />releases around the delta area was proposed by the Bureau in 1950, Th( <br />Pecos River Commission rejected the plan, and proposed one consisting <br />of a conveyance and drainage channel with a cleared floodway. <br /> <br />Acknowledgments <br /> <br />The plan reported on herein is that specifically advanced <br />by the Pecos River Commission. The hydrologic studies on which the <br />details of the plan and the estimates of water salvage are based <br />were accomplished through the joint efforts of the Bureau of <br />Reclamation; the Pecos River Commission, the Engineering Advisors to <br />that commission, and members of the New Mexico Interstate Stream <br />Commission staff. Officials of the various irrigation districts <br />throughout the basin have:' ft'.Inia!Ed data on the land and water use as <br />well as the agricultural practices followed in their projects. <br /> <br />Information available in basin reports by the National <br />Resources Planning Board, Soil Conservation Service, Corps of Engineers <br />and Federal Pot-ler Commission was used in compiling the report. Basic <br />data wore obtain8d from Geological Survey, Weather Bureau, and Bureau <br />of the Census publications. <br /> <br />DESCRIPTION OF McMILLAN DEIXA AREA <br /> <br />The McMillan Delta area is an almost flat plain, varying <br />in width from one and one-half to three miles, which has been formed <br />by sediment deposition in and above the reservoir since 1894, It <br />presents the most serious prob:em from the standpoint of nonbeneq <br />ficial use of water by salt cedar in the basin. The first observation <br />of salt cedars in the area 0u,ur.r"ri i.n ::"914. By the following year, <br />some 600 acres of ::.nfestation was reported. The area increased to <br />9,800 acres in 1939, and 11;600 acres in 1946, In 1950, when the <br />latest survey was made, the delta area contained about 13,500 acres, <br />de'roted to the following water consuming uses: <br /> <br />Salt cedars , , . , . , . . . , , . . 10,160 acres <br />Openings (usually range grass), , , . BBo acres <br />Channels , , . , . . , . . . . . , . 410 acres <br />Tules and 11arsh gras s . , , . . . , . 1,180 acres <br />Salt grass, . . . . . , , , . . . . . 590 acres <br />j'Jater surface (trapped lakes) , , . . 250 acres <br />Cocklebur , , , , , . , . . , , . . . 30 acres <br />Experimental plot , . , , , . . , , . 20 acre s <br /> <br />TarAL 0 Co . . . . <br /> <br />. , . <br /> <br />, , , , 13,520 acres <br /> <br />. . , <br /> <br />The vegetative cover in the delta area is shown on the <br />map preceding page 1. <br /> <br />h~ere the Rio penasco enters the McMillan Delta from the west <br />a secondary delta has formed, creating a swamp immediately upstream and <br /> <br />2 <br />