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0 <br /> Rh = 0.5/4 = 0.125 <br /> S = 1 /3.34 = 0..299 <br /> V470 = 9.70 fps <br /> 3330 9.59 fps <br /> Tt470 = 470/9.70 = 48.45 sec. <br /> Tt333 p = 3330/9.59 = 347.24 sec. <br /> Tc = 48.45+347.24/3600 = 0.110 hr <br /> qp = 950 cf s Fig. 5-2 <br /> q= 95 0(0.123)(1.41) = 165 cgs. <br />a SUMMARY OF CALCULATIONS <br />Capacity of the Drainage prior to <br />modification 165 cfs. <br />a Capacity of drainage with the <br />6 inch pipe installed 165 cfs <br />Peak discharge from watershed is 152 cfs. <br />The figures indicate that the 6 inch pipe would handle the <br />flow created by a 100 year/24 hour event without backing water up <br />in the drainage and creating a holding pond. <br /> <br />a SSTICaATED F]IRIIAIG TII~TABLE <br /> (anended ~iay, 1985) <br /> Stage <br />1 Years <br />3-5 Total Acres <br />25.40 Mined Acres <br />18.52 <br /> 2 35-45 63.71 61.42 <br /> A 1 0.36 0.00 <br />a S 0 20.32 0.00 <br /> W 0 8.72 0.00 <br /> X 9 months 4.16 0.00 <br />a Y 1 1.26 0.00 <br /> Z 1 1.95 0.00 <br /> T~DTAL ACRES 125.88 79.94 <br />a <br />a <br />a <br />a <br />a <br />8 <br />a <br />