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<br />Attempts are present being made to control chap'-al brush without even <br />temporarily increasing erosion by making test applications of shrub killing <br />chemicals, by mechanical root-plowing and by controlled burning on alternate <br />contour strips during months when the use of fire is safe. Once desired <br />management practices are developed, it will be possible to reduce costly <br />and destructive wildfires, reduce erosion that follows wildfires, increase <br />water yields, and increase forage and palatable browse for livestock and <br />game. <br /> <br />Streambank Vel2'etation <br /> <br />The most extravagant wasters of water are trees lining creeks and drywashes <br />from the top of the watersheds to the downstream dama. <br /> <br />." <br /> <br />Many agencies are engaged in studying the use of water by salt cedar and <br />po s sible methods of controlling this specie s. <br /> <br />~ <br /> <br />Another major experiment aimed at determining the wasteful use of water by <br />cottonwoods and pos sible recovery of water through control is being conducted <br />by the Geological Survey in cooperation with the State Land Department and <br />the Salt River Valley Water Users' Association on Cottonwood Wash, south- <br />east of Kingman (Figure 10). <br /> <br />Figure 10. Measuring wa t e r yields after treatment of cotton- <br />woods. Cottonwood Wash. <br /> <br />'. <br /> <br />~. <br /> <br />- 12 - <br />