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Explanation and Use of the Blaney-Criddle Water Balance Model <br />July 28, 1998 <br />Page 2 <br />An example of the basic information data block is below: <br />Facili Name: Valle Golf Villa e <br />Location: Somewhere, AZ <br /> <br />System average daily flow: (MG/D) 0.4000 <br /> <br />Yearly evaporation rate: <br />in/ ear): 71.00 <br />Total (ake and free water surface area: 1.10 <br /> <br />Landsca e acrea e: 160.00 <br /> <br />Summer cro : Bermuda rass <br />Winter cro : R e rass <br /> <br />Estimated Storage required (gal./mo.): 16,378,754 <br />Water balance total/ ear: (98,461,955) <br />A positive value indicates insufficient water usage, a negative value is <br />indicated by (parentheses). <br />The basic model is designated (set-up) for calculating turf irrigation. The standard turf plant <br />configuration is a combination of Bermuda grass and rye grass. The Bermuda grass is the main <br />summer specie and the rye grass provides far the winter water consumption. <br />The second data block is located along the top center of the spreadsheet. This entry block is the <br />basis for the Blaney-Criddle water consumption calculations. The K value, Monthly % daytime <br />hours of the year, and mean monthly temperatures are entered into this part of the spreadsheet. <br />The K values entered into the basic model are for the Bermuda rye grass mix. Additional <br />vegetative K values are available in the USDA, Agricultural Research Service, Conservation <br />Research Report Number 29, 1981 and other sources.