Name: Blaney Rainfall Thiessen Areas

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN>The South Florida Water Management District uses a modified Blaney-Criddle equation to determine evapotranspiration. This polygon feature class defines the location and extent of areas associated with rainfall monitoring sites used to calculate net depth of application area Districtwide. </SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>The 'Modified Blaney-Criddle' is a variation of Blaney Criddle, which multiplies the ET from Blaney-Criddle by a coefficient that relates mean air temperature to the growth stage of a crop. Additionally, effective rainfall is calculated using the mean temperature and hours of daylight, the Blaney-Criddle ET, average monthly rainfall and soil factor. Further calculations consider average rainfall to drought rainfall (1-in-10 year drought). The difference between monthly drought effective rainfall and monthly ET becomes the basis for water allocations.</SPAN></SPAN></P></DIV></DIV></DIV>

Service Item Id: d5b3053d418b484d88c1b918a03324f0

Copyright Text: SFWMD, Regulation: SFWMD shares regulatory responsibilities for managing and protecting regional water resources with the Florida Department of Environmental Protection and other state and local governments. Geospatial Services manages and maintains geospatial products and data related to the Regulation business function. Regulation provides oversight over these products.

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