88 



DIVISION OF WATER RESOURCES 



PLATE VII 



300 



250 



c 200 





ISO 



100 



SO 



Twelve Inch, double . stove-pipe casing 

 (Estimated life ZOyears) 



Depth Casing Total 



4 6 8 10 12 



Annual charges on wells in dollars per acre-foot 



Annual 



14 



ANNUAL CHARGES ON TWELVE-INCH STOVE-PIPE WELLS. 



ever, since, as anticipated, variation in pumpinj; lift, crop requirement, 

 installed plant capacity per acre, hours of plant operation per annum, 

 etc., was great, no attempt was made to compare the cost of water 

 in one area with that in another. 



In order to show the effect of the pumping lift and the duration 

 of operation on the cost of pumping per acre-foot with a deep well 

 turbine delivering one cubic foot per second (450 gallons per minute) 

 Plate VI has been prepared. The total annual cost of pumping includes 

 interest at 6 per cent, taxes at 1 per cent, and depreciation at 5 per 

 cent on the cost of the deep-well turbine, starting equipment, and 

 housing. Prices which prevailed in the first six months of 1930 were 

 used in computing the capital cost. The annual allowance to cover 

 repairs and lubrication is indicated on the diagram. Power charges 

 were made according to the P-2 schedule of the San Joaquin Light and 

 Powor Cor])oration. 



The total annual cost of puinjjing, including the above items but not 

 the annual charges on the well, was comjiuted for operation periods of 

 1000 hours per annum and up, the greatest being for SOOO of the 8760 

 honi-s whif'h make up the usual ealcndar y(>ar. 



The slanting, discontinuous lines on IMatc VI show the estimated 

 j)umping costs per acre-foot for pnin]nng lifts of from 20 to 240 feet for 

 the indicated hours of operation. Discontinuity results from the neces- 

 sity of increasing the si/c of motor, pump head, and starting equipment 

 .'it intervals ;is tlio lift incrcnscs. ^Totor sizes are shown to the right of 



