Laserfiche WebLink
<br />. <br /> <br />groundwater conditions existent in the area and permit a reaso~bly <br />precise evaluation of the potential groundwater salvage, Pend~ng <br />completion of such survey, consideration of the spur drains has been <br />deferred. HOHever, in the studies sUHlmarized herein, an estimate of <br />the potential salvage of groundwaters attributable solely to the <br />construction of the conveJ~ce channel and floodway has been included <br />as summarized below. This estimate is considered conservative. <br /> <br />There is a considerable amount of groundwater inflow from <br />the west to the area west of the location of the proposed conveyance <br />channel between the Artesia Bridge and the Rio Penasco. Under present <br />conditions. the high rate of consumptive use in this area is being <br />partially supplied by groundwater, With the conveyance channel in <br />operation. the depth to water table in the area would be increased. <br />with a consequent reduction in the consurnptive use by native vegetation. <br />The consun~tive use under present and future conditions in the area <br />was computed by the Blaney-Criddle method. using the Blaney coefficients <br />for the t~~es and densities of naoive vegetation in the area under <br />present conditions. The coefficients Here adjusted for present and <br />future conditions of depth to grOlUld'.>rater. The average annual salvage <br />that would result from the lowering of the >later table in the area <br />west of the conveyance channel between the Artesia Bridge and the Rio <br />Penasco was estimated to be 3,2LO acreufeet, <br /> <br />Additional salvage will also be accomplished by clearing of <br />the dense gro,~h of salt cedar from the floodwny. A measure of this <br />salvage is the difference between the present consumptive use by <br />native vegetation in the floodway area and the consumptive use of the <br />expected floodway vegetative cover under future water table conditions. <br />This difference in consumptive use was estimated by the Blaney- <br />Criddle method to average 3,SBO acre~feet per ~~ar. <br /> <br />{l& <br />~2' <br /> <br />The total water salvage attributable to the proposed convey- <br />ance channel was determined by adding the floodway flows to the convey- <br />ance channel flows, as determined for future' conditions by correlation; <br />subtracting the calculated floodway losses and historic outflow, as <br />determined by the mean of three multiple correlations; and then adding <br />the salvage that results from lowering the water table and from clear- <br />ing the floodway. This total salvage amounts to an average of 2L,490 <br />acre-feet annually for the period January 1, 193B through December 31, <br />1953. as sho,m in Table 1. which is the period that .Alamogord~ <br />Reservoir has been in full operation, Since the maxim~ and minimum <br />annual flows of record are contained in this relatively short period. <br />and are therefore not protrayed in their actual historic frequency of <br />occurrence. the studies were extended to determine the average annual <br />salvage that would be realized over the long-time period from January 1. <br />1905 through December 31, 19S3. <br /> <br />. <br /> <br />The average annual discharge of the Pecos River near Artesia <br />for the calendar years 1905 through 1953 is 270.200 acre-feet. How- <br />ever. Alamogordo Reservoir was not in operation for the first 33 years <br />of this period and the recorded flows from 1905 through 1907 could not <br />be used directly to determine the salvage that could be attained during <br /> <br />Rev. 12-3-54 <br /> <br />9 <br />