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the water budget and the surface water modeling efforts, is generally available from NOAA and <br />reservoir owners. <br />Objective: <br />Investigate the availability and collect additional climate data (other than the NOAA data already <br />existing in the State's central database) for the period of record for the South Platte and North <br />Platte River Basins. Determine appropriate methods for estimating missing climate data and <br />develop complete climate data sets for the selected study period. Assign climate stations to <br />geographic areas for use in the consumptive use analysis. <br />Approach: <br />53.1 Collect/digitize daily data for temperature, precipitation, wind speed, solar radiation, and <br />vapor pressure from approximately 20 existing data sources including CoAgMet and <br />NCWCD climate stations (note that wind speed, solar radiation, and vapor pressure data <br />is not generally available from NOAA climate stations). Collect available evaporation <br />data from reservoir owners and operators. Note that NOAA climate data is already <br />included in HydroBase. It is anticipated that the daily data collected will be used to <br />develop locally calibrated crop coefficients using the Kimberly-Penman technique in a <br />subsequent SPDSS phase. <br />53.2 Investigate and determine appropriate methods for filling missing monthly data using <br />CDSS estimation procedures available in the data management interface TSTooI. Use <br />representative long-term NOAA climate stations to determine/investigate appropriate <br />relationships for data filling. Review data filling techniques used by the State for the <br />High Plains area for applicability in other parts of the basin. Prepare a written <br />recommendation to the State regarding filling procedures for each data type (temperature, <br />precipitation, and frost dates). <br />53.3 Identify approximately 40 key long-term NOAA climate stations located in the South <br />Platte and North Platte River Basin that adequately represent variations in climate seen <br />throughout the basins (SPDSS Feasibility Study, October 2001). Data will be filled, <br />using the recommended techniques, to create period of record monthly data to support the <br />estimation of historic crop consumptive use using the Blaney-Griddle methodology. <br />53.4 Assign the key climate station(s) to geographic areas. The geographic area definition will <br />be performed using GIS and considering the location of irrigated acreage, county <br />boundaries, HUC boundaries, and climate station locations. This will be performed in <br />ArcView based on visual inspection, engineering judgment and relative locations of the <br />irrigated acreage to the climate stations similar to the approach adopted for RGDSS. <br />Analytical techniques such as Thessian polygons will be considered and, if approved by <br />the State, implemented. <br />Deliverables: <br />53.1 CoAgMet, NCWCD, and reservoir climate data in the requested digitized format to the <br />HydroBase data manager for storage plus a memorandum describing the data source, <br />contact name, and data formatting requirements. <br />SPDSS Consumptive Use and Water Budget Component l l <br />