WATEK STORAGE ON SWEETWATER AND SAN JACINTO RIVERS. 



391 



Riverside County' claiming the waters of that stream. Riverside County was fonned 

 in 189.5, and all the watershed area and the lands irrigated from the stream are now in 

 that countA', and while an enormous quantitj' of water has been filed upon from the 

 stream below the junction of Hemet Creek, no filings have been made of the waters 

 of that branch of the river. 



The Hemet Dam successfully impounds all the waters that have come down to it 

 since its completion in 1895, and therefore actually appropriates the water, although 

 it will be observed bj- reading the list of filings that no claim to water for the reser- 

 voir itself has been made by the Lake Hemet Water Companj-, the owners of the 

 dam, and their only filing for anj' amount anywhere approximating the capacitj' of 

 the reservoir is for 4,000 inches, located at the diverting dam, 9 miles below the 

 reservoir. 



THE HEMET DAM. 



This structure was planned by the writer for a possible height of 160 feet above 

 the stream bed, and the profile built up to the height of 110 feet is of a section 

 designed to carry the full ultimate height. At that level of 110 feet the thickness 

 is 30 feet. An offset of 20 feet was here made, and the wall carried up to 122.5 

 feet, with a crest 10 feet wide. The height above lowest foundation is 135 feet; the 

 thickness at base, 100 feet; top length, 246 feet; base length, 30 feet. It is arched 

 upstream with a radius of 225.4 feet, and is built of granite rubble laid in Portland 

 cement concrete, the contents being 31,105 cubic yards. 



The capacity of the reservoir is as follows: 



Capacity of Hemet Lake. 



a Lowest outlet. 



6 Top of dam. 



The reservoir has never been entirely filled since its completion to its present 

 height, October 9, 1895, although when it had reached a height of 107 feet there came 

 a flood, January 9, 1893, which filled the reservoir and poured over the top of the 

 dam to a depth of several feet. The i-ecord of subsequent inflow and draft has been 

 so imperfectly kept that no reliable estimate can be made of the actual run off from 

 the watershed during the past five years. At the high elevation at which the reser- 

 voir and its watershed lie, the run off should be sufficient to fill the reservoir with 



