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180 <br />160 <br />140 <br />h <br />E <br />0 120 <br />Y <br />V <br />d <br />L <br />v 100 <br />w <br />0 <br />d <br />E 80 <br />z <br />E <br />E 60 <br />c <br />40 <br />20 <br />Figure 6c, Minimum Number of Check Dams <br />Using CN = 78 <br />50 100 150 200 <br />Drainage Area, Acres <br />19 <br />250 300 350 <br />— CN=78 at 5% <br />—CN=78 a'10% <br />—CN=78 at 15% <br />—CN=78 at 20% <br />—CN=78 at 25% <br />j <br />50 100 150 200 <br />Drainage Area, Acres <br />19 <br />250 300 350 <br />