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<br />APPENDIX B <br /> <br />BEST MANAGEMENT PRACTICES AND EXPLANATIONS <br /> <br />~ <br /> <br />Best Management Practices are conservation measures that should be <br />installed to reduce the adverse affects of irrigated agriculture on water <br />quality. These practices reduce erosion, sediment and salt loading from <br />irrigated crop and pasture lands. Installation of these practices will <br />help restore stream flow to a higher quality. <br /> <br />Selected material was taken from "Agriculturally Related Diffuse <br />Sources", Water Quality Series, Clark County 208 Water Quality Management <br />Plan, Clark County, Nevada, Clark County Conservation District, January <br />1978. Conservation practices identified in the Clark County Plan are <br />practices which are included in thp. U~.DA-SCS, "National Handbook of <br />Conservation Practices." Names of conservation practices used for county <br />planning differ somewhat from names designated as official by the SCS. <br /> <br />A list of recommended practices for Virgin Valley and a discussion <br />of their application follows: <br /> <br />IRRIGATION WATER MANAGEMENT <br /> <br />WATER EROSION CONTROL <br /> <br />Water Measuring Devices <br />Improved Methods of Irrigation <br />Lpvel Borders or Basins <br />Graded Borders <br />Sprinkler Irrigation <br />Canal and Ditch Lining Systems <br />Water Control Structures <br />Pipeline Distribution Systems <br />Tailwater Recovery Systems <br /> <br />Grassed Waterways with <br />Irrigation <br />Crop Rotation <br />Cover Crops <br />Pasture Management <br /> <br />Irri~ation Water Mana~ement <br /> <br />Determining and controlling the rate, amount and timing of irrigation <br />water application in an efficient manner is necessary to effectively <br />utilize available water supply: Managing and controlling the moisture <br />environment of crops is needed to promote the desired crop response. <br />Minimizing soil erosion and loss of plant nutrients and controlling unde- <br />sirable water loss protects water quality. The following practices are <br />recommended to improve irrigation water management and water quality. <br /> <br />Water Measuring Devices <br /> <br />A measuring device is used by an irrigator to determine how much <br />water is used and when to make necessary adjustments for efficient use. <br />The simplest of all measuring devices is a weir, but it requires a con- <br /> <br />", r /" f.- (\ <br />t; '..I \.' ,. \J.... <br /> <br />B-1 <br />