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sprinkler use efficiencies were decreased to 55 percent and 75 percent respectively, the <br />consumptive use from surface water decreased by 6 percent. <br />We believe the recommended conveyance efficiencies are appropriate for use in analyses <br />performed as part of the RGDSS project. However, ditch loss data was only available for <br />large ditch systems. In addition, the GIS canal coverage does not include all the ditch <br />systems, and some ditches include main canal plus laterals while others only include the <br />main canal only. If more information becomes available through further investigations, <br />ditch-specific conveyance efficiencies maybe more accurately determined based on: <br />- More complete ditch length coverage <br />- Information on depth to underlying water table <br />- Location of ditch compared to other ditches (return flow considerations) <br />appendB_cropcu_6-2004.doc B-19 of B-19 12/13/00 <br />