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Blaney-Criddle TR-21 <br />1.SCS modified the monthly B-C Equation from TB 1275 <br /> <br />•Introduced Crop Growth Stage Coefficient (kc) <br /> <br />•Not a “crop coefficient” <br /> <br />2.Provided kc for 24 different crops in western U.S. <br /> <br />3.Source of coefficients was likely TB 1275 (Woodward 1963)