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TABLE II-2. MANAGEMENT AND STRUCTURAL PRACTICES CONSIDERED FOR THREE LEVELS OF IMPROVEMENT LOWER GUNNISON SALINITY CONTROL STUDY, COLORADO Leve 1 ;~ Improvement Mana~ement Practices 1 (Minimum) 2 (Total) Time of Set-Closest multiple of 3 hours Number of Irri~ations Flow Rate per furrow unchan~e from present practice 1/ Time of Set-Closest multiple of 12 hours 2/ Number of Irri~ations Flow Rate per Furrow i/ - ~easured to closest I ~allon per minute 3 (Total With Automation) Time of Set-multiple of 3 hrs. Number of Irrigations Flow Rate per Furrow 2/ - measured to closest l-~allon per minute Chan~e Irri~ation Method to Drip, Sprinkler or Border IRRIGATED LAND Structural Practices Land Leveling Water Measuring Devices Ditch Lining or Pipelines Land Leveling Water Measuring Devices Ditch Lining or Pipelines Land Leveling, Including Combining of Fields Ditch Lining, Including some Tailwater Ditches Pipelines and Gated Pipe Closed Drains Automated Timing Devices and Controls Land Leveling Water Measuring Devices Ditch Linin~ or Pipelines Land Leveling, Including Combining of Fields Ditch Lining, Including some Tailwater Ditches Pipelines and Gated Pipe Closed Drains Land Leveling, Including Combining of Fields, Except where Drip or Sprinkler Irrigation will be used Combine Fields and Reorganize Irrigation System 1/ Values representative of present practice were-determined by onfann inventory. 2/ Duration of irrigation in multiples of 12-hours is typical of present practice. 3/ To avoid erosive velocity of flow an internal constraint of the program limited maximum flow rate to the value of 15 divided by the field s.lo~ percent (I5/S). II-8 , ;1 ,uGlill. \'