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approximately $186,900, and annual operation and maintenance (including power) would be <br />approximately $88,400. <br />A portion of the diversion reduction used in the groundwater pumping unit cost reflects a <br />seepage loss component proportional to the groundwater which would be pumped nearer the <br />point of delivery. This diversion reduction amount is due to the seepage loss which would <br />have occurred had the same quantity of water been delivered through the entire delivery <br />system. CNPPID's reported delivery system efficiency rate is approximately 50 percent (1994 <br />RDEIS, page 4 -30). Based on the estimated seepage loss reduction associated with the level of <br />canal lining installation included in the implementation scenarios discussed later, it is assumed <br />overall delivery system efficiency would increase from 50 to 60 percent. Hence, an assumed <br />40 percent seepage loss component is applied to groundwater supply quantity. Based on this <br />assumed 40 percent seepage loss rate, each well field would yield a net diversion reduction of <br />12,000 of (7,200/0.60). <br />Water Delivery Scheduling <br />This measure would include the installation of weather stations and communications equipment <br />which would be utilized to better determine crop demands and improve irrigation delivery <br />scheduling. Support of the system would require additional staff to be employed by the <br />Districts. <br />It is assumed five weather stations would be installed and a communications /data processing <br />system would be employed at a total initial cost of $60,000. The design life of this equipment <br />is assumed to be 10 years, resulting in a total combined 40 -year installation and replacement <br />cost of $240,000. The annual operation and maintenance cost, based on two full -time support <br />staff, is assumed to be $80,000. <br />Utilization of this equipment would allow the Districts to convert from their rotation delivery <br />' system to a demand system. It is assumed conversion to the demand delivery system would <br />result in an annual delivery reduction of 3,465 af. This quantity is based on the assumption <br />' that those irrigators currently using gated pipe and sprinklers (approximately 69,300 acres as <br />reported in the Plan) would reduce their delivery requirement on average by 0.05 of per acre. <br />The water delivery schedule modifications would result in water savings to be realized at the <br />irrigator's headgate. Therefore, a delivery loss component of this diversion reduction is <br />included similar to that discussed above for groundwater supply development. The delivery <br />' loss factor assumed for this measure is also 40 percent, which results in a net diversion <br />reduction of 5,775 of (3,365/0.60). <br />' Economic Analysis <br />The conservation measure unit cost estimates used for this discussion include a combined <br />' installation and replacement cost, and annual operation and maintenance cost at a 1996 cost <br />level as described above. The unit cost estimates used for each of the measures included in <br />this analysis are summarized in Table 1 below. <br />