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SPDSS Core Advisory Committee Meeting Minutes <br />October 3, 2005 <br />Page 4 <br />IV. Erin Wilson, LRE -Consumptive Use/Surface Water Data <br />a) Presentation summary (Presentation prodded on CD) <br />i) How CU products tie to other SPDSS efforts <br />(1) Feed into surface water and groundwater planning models and CDSS analysis tools <br />ii) CU primary efforts to date <br />(1) Document water use and administration by water district <br />(a) Individual meetings with water commissioners and division engineer <br />(b) Straight-line diagrams created/updated <br />(c) Water User Memoranda <br />(2) Understand water sources (direct, reservoir, gw, transbasin), irrigation practices and <br />ditch losses <br />(3) Select and fill key climate station data <br />iii) Crop CU primary efforts to date <br />(1) Investigate crop ET and effective precipitation methods and estimates <br />(2) Select crop coefficients for local conditions <br />(3) Estimate potential ET at climate stations <br />(4) Develop initial basin-wide water budget <br />iv) CU method review and selection -potential conclusions <br />(1) Blaney-Criddle using TR-21 coefficients prominent method <br />(2) Level of detail conformed to user's needs <br />(3) "Local calibration" of CU coefficients gaining favor <br />(4) ASCE standardized Penman-Monteith Daily Method recognized as more accurate <br />(5) Lysimeter studies primarily for high-altitude grass <br />(6) Recommend ASCE standardized P-M to locally calibrate Blaney-Criddle and <br />lysimeter results <br />v) Successful peer review process <br />(1) First meeting September 20, 2005 <br />(2) Over 20 attendees <br />(3) Received positive feedback and specific suggestions <br />vi) Review of upcoming efforts <br />b) Discussion <br />i) State has followed Erin's proposed approach in past legal issues <br />