WATER STORAGE ON SWEETWATER AND SAN JACINTO RIVERS. 



373 



The following table is a suminan' of the various pumping developments described 

 in the foregoing pages: 



Pumping plants in Sweetwater Valley installed in 189S, 1899, and 1900. 



a Sump. 



The first three of these plants are not now in existence, or at least they have 

 been substituted by some one of the other nine plants. The first two, as heretofore 

 explained, were experimental and tentative, and of a ver}- temporary character. 

 Most of the others, with the exception of those in the reservoir, are well housed, 

 and two of them are in the nature of permanent pumping works, first-class in all 

 their appointments. 



The plants which furnished the main supply of the San Diego Land and Town 

 Company last year are numbered 4, 5, 6, 8, and 11 in the table. Number 11 was 

 added quite late in the season. The test yield of the five plants was 625 miner's 

 inches, but the wells did not long maintain the large 3'ield shown at the time of their 

 test, and, as nearlj^ as can be ascertained, the net output for the season averaged 

 only about 235 miner's inches. The pump records showed a total volume pumped 

 for the season of 610,575,500 gallons, from which 25 per cent was deducted for 

 probable slip in pumps, making the estimated actual delivery 457,931,600 gallons. 

 As pumping was fairh' continuous from June 1 to November 20, the time of actual 

 pumping is reckoned at about one hundred and fifty days, making the delivery 

 average 3,055,000 gallons per day, equal to 235 miner's inches measured under 4-inch 

 pressure. The plane of saturation in the lower valley below the dam was lowered 

 from 5 to 25 feet in the vicinity of the pumping plants as the result of this pumping. 

 The total estimated volume pumped was equal to 1,405 acre-feet, or 6.25 per cent of 

 the maximum capacity of the reservoir. 



The writer is under special obligations to Mr. H. N. Savage, chief engineer of 

 the San Diego Land and Town Company, for the data used in this report, which had 



