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Timeline: <br />1945 - B-C Equation First Published <br /> Blaney, H.F. and Criddle, W.D. (1945). “A method of estimating water requirements in <br /> irrigated areas from climatological data: Washington.” U.S. Soil Cons. Service <br /> <br />1950 - First Revision to B-C Equation (SCS-TP-96) <br /> Blaney, H.F. and Criddle, W.D. (1950). “Determining Water Requirements in Irrigated <br /> Areas from Climatological and Irrigation Data.” SCS-TP-96 <br /> <br />1959 - Provisional Supplement to SCS-TP-96 <br /> Blaney, H.F., Haise, H.R. and Jensen, M.E. (1959). “Monthly Consumptive Use by Irrigated <br /> Crops in Western United States, Provisional Supplement to SCS-TP-96 <br /> <br />1962 - Second Revision to B-C Equation (TB-1275) <br /> Blaney, H.F. and Criddle, W.D. (1962). “Determining Consumptive Use and Irrigation <br /> Water Requirements.” Tech. Bull. 1275, USDA–ARS <br /> <br />1963 - Woodward <br /> “A Modification of the Blaney–Criddle Method for Computing Consumptive Use.” ASAE <br /> annual meeting of Pacific NW Section in October 1963 <br /> <br />1967 - SCS Modified B-C Equation <br /> USDA – Soil. Cons. Service. (1967). “Irrigation Water Requirements.” Tech. Release No. 21 <br /> <br />1970 - Revision to TR-21