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0 <br />5 <br />10 <br />15 <br />20 <br />25 <br />30 <br />35 <br />40 <br />45 <br />1992 1994 1996 1998 2000 2002 2004 2006 2008 2010Annual Crop Water Requirement Year <br />SCS TR-21 <br />Example: Crop water requirements using B-C with SCS TR-21 coefficients