Appendix to the Journals of the Senate and Assembly of the ..session of the Legislature of the State of California . am of the mountain drainage inboth maximum rate and annual amount of discharge. Its watershed,although not the largest, embraces a larger area at high elevation thanany other branch and its summer flow is kept up by the slow^ meltingof snow on Mt. San Gorgonio. This stream falls from an elevation of11,485 feet at the summit of the peak to 1,400 feet at the mouth of thecanyon in 20 miles, or at the rate of 504 feet per mile. The mouthof Whitewater Canyon is show^n by PL II, Fig,
Appendix to the Journals of the Senate and Assembly of the ..session of the Legislature of the State of California . am of the mountain drainage inboth maximum rate and annual amount of discharge. Its watershed,although not the largest, embraces a larger area at high elevation thanany other branch and its summer flow is kept up by the slow^ meltingof snow on Mt. San Gorgonio. This stream falls from an elevation of11,485 feet at the summit of the peak to 1,400 feet at the mouth of thecanyon in 20 miles, or at the rate of 504 feet per mile. The mouthof Whitewater Canyon is show^n by PL II, Fig, 1. San Gorgonio River is a more extended branch of the Whitewaterdrainage than the Whitewater itself and is the second stream in sizeentering San Gorgonio Pass. Millard Canyon and Potrero Creek flowin small amount through the summer. ^Mission and Big and Little Morongo creeks, although having a largewatershed, do not drain an area of as high precipitation as streamsentering the pass. Snow Creek, which drains the north slope of Mt. San Jacinto, andTahquiz Creek, which drains the eastern slopes of San Jacinto and. Plate II, Fig. 1 (upper).—Looking up stream at mouth of Whitewater Canyon April 3, 1916,showing coarseness of gravels at the head of the debris cone. Fig. 2 (lower).—Mouth of SantaAna Canyon. Bui. 4—(p 4) 27335 FLOOD CONTROL IN COACIIELLA VALLEY. O Taliquiz p?aks, are remarkable for ])cino precipitous. It is doubtfulif their grades are ecpialed by those of any other streams of equal orgreater length in western United States. Snow Creek falls from thesummit of Mt. San Jacinto at elevation of 10,805 feet to 1,250 feet inSan Gorgonio Pass, or at the rate of 1,365 feet per mile for its entirelength, while Tahquiz Creek falls 10,305 feet from the same summit tothe desert at Palm Springs in 10 miles at the rate of 1,030 feet permile. The flow of Tahquiz Creek is much more constant than SnowCreek for the reason that the former has its source in mountain flats,while the l
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