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45 <br />40 <br />35 <br />y <br />E <br />0 30 <br />Y <br />V <br />m <br />Z <br />V 25 <br />0 <br />E 20 <br />z <br />E <br />E 15 <br />c <br />10 <br />Figure 6b, Minimum Number of Check Dams <br />Using CN = 72 <br />50 100 150 200 250 300 350 <br />Drainage Area, Acres <br />in <br />—CN=72 at 5% <br />—CN=72 at 10% <br />—CN=72 at 15% <br />—CN=72 at 20% <br />—CN=72 at 25% <br />50 100 150 200 250 300 350 <br />Drainage Area, Acres <br />in <br />