210 



THE IRRIGATION AGE. 



is found near Bakersfield, where a small reservoir 275 While for the Lemoore Ditch the oil was harrowed 



feet long and 75 feet wide is built in almost pure, coarse into the soil, in this case the oil was poured on the sur- 



sand. A centrifugal pump delivered to the reservoir face and allowed to soak in. This formed a tough 



2,250 gallons of water per minute for twelve hours, and asphaltum crust of about 3 or 4 inches in thickness. 



Fig. 15. Method of Using Templet to Finish Trenches. 



it would leak out as fast as poured in. It was then de- The seepage was greatly reduced and now the reservoir 



cided to use road oil to prevent this excessively large can be rapidly filled with the same pump. 



seepage. One hundred and eighty-five barrels of heavy Another example of the use of oil for lining a 



Fig. 14A. Method of Using Templet. 



Fig. 14B. Distributing Flume Gate Measuring Past. 



oil (11 specific gravity Beaume scale) were poured reservoir is near Los Angeles the Ivanhoe Reservoir, 



while hot on the bottom of the reservoir. Since one (Fig. 12.) Here it was found necessary to protect the 



barrel of oil contains 42 gallons, the rate at which the sloping banks from the erosive action of the waves. On 



oil was applied was 3.31 gallons per square yard. the slopes were spread 3 inches of river sand, fairly 



