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<br />N <br />~ <br />~ <br />-..J <br /> <br />Bureau of Land Management Programs <br />The Bureau of Land Management (BLM) is continuing to <br />collect water quality data on perennial and ephemeral <br />stream channels on public lands. Channels were selected <br /> <br />to provide information on water quality yields from water- <br />sheds having a variety of natural and man-caused conditions. <br />These study areas will also provide information on water <br /> <br />quality yields from soils of varying stability, different <br /> <br /> <br />plant conununities and plant health, and different grazing <br /> <br />intensities and classes of livestock. Because of varia- <br /> <br />tions in elevation and geography, data will also reflect the <br /> <br />effects of storms of varying intensity, duration, and season. <br /> <br /> <br />Very little data exists from ephemeral channels. <br /> <br /> <br />Natural hazards make collection of data difficult. For <br /> <br />example, sediment carried in runoff tends to plug automatic <br />sampler intakes, and flash floods destroy intakes and con- <br />trol structures such as flumes. Through experience, BLM <br />is developing sampling procedures which overcome some of <br /> <br />the natural hazards. <br /> <br />A rainfall simulation-livestock movement study has <br /> <br />been developed and a contract signed. Work began in the <br /> <br />summer of 1980 and stopped because severe cracking of <br />loess surface soil over the Mancos-derived soils allowed <br /> <br />no runoff. <br /> <br />A new site has been located and work will <br /> <br />resume in early summer 1981. Objectives are to determine <br /> <br />-19- <br /> <br />i:1;.,~ <br />