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. . Results of chernical analyses of water from the Wichita River in 1923 and from Lalce Kemp in 1926 and 1939 are given in Table 5. Table 5. - Analysis of water from Wichita River and Lake Kemp Source of ~Iater and year analyzed ~iJichita River Lake Kemp : Lake Kemp Salts (1923) (1926) 1} (1939) Y ppm ppm ppm CaS 04 522 566 62/+ CaSo3 76 90 : 71 MgS04 128 160 181 liJgC14 18 . 12 23 . NaC12 658 : 798 1,104 : NaF 8 : Total 1,402 1,626 . 2,011 . 11 G. S. Fraps, Analyst. y E. P. Schoch, Analyst. To date, judicious use of these waters on lands that are adequately drained' has not proved injurious. There is ample evidence, however, to suggest that the use of these waters on lands that do not drain readily is defi~jtely injurious. A large part of tho salt accumulations cannot be blamed directly on the salt content of the water used. A considerable acreage of the land to ~lhich water was originally applied contained fairly large quantities of soluble salts and the application of even relatively salt free ~lator, without providing drainaee, ~Iould in time have resulted in the translocation and accumulation of soluble salts in the root zone. Quantity The dr8.ina~;e area from ~rhich this project derives its water supply lies west of Lake Kemp in an area where precipitation averaeos 3 to 5 inches less than the project area. !\verage arumal unit yield for the period 1930-39, inclusive, ranges from an estimated 60 a. f. per square mile in the headwaters to more than 100 a. f. in the lower portions above the dam. ll! Based on these; estimates the average annual basin yield available for storage amounts te 140,000 acre-feet. Hith 478,200 acre-feet of availa- b~e storage capacity this qu~ntity o.p~)ears to be more than adequate for all present needs of the two districts. W "General Informat:!.on on the Natural Surface-Hater Supply Areas of Texas". Bur. Agr. Econ., U.S. Dopt. Agr. Jan. 1945. (Mimeo.) 14