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Methods <br /> Design criteria for the drainage control structures have been developed using <br /> U. S. Soil Conservation Service lethods. References used include: Determination <br /> of Peak Flows Within Colorado (1977) , SCS Technical Note 50 and National <br /> Engineering Handbook Number 4. <br /> Flood runoff flows for a 10 year - 24 hour Type II design storm were determined <br /> by hydrograph analysis. Each drainage area tributary to culverts and ditches <br /> was evaluated by a computer programmed hydrograph procedure that is based on U. S. <br /> Soil Conservation Service computer programs. <br /> The results of the calculations are described in Table 1 for each road. The <br /> attached plates show design details, drainage sub areas , flow directions, culvert <br /> locations, and critical situations. <br /> Design of drainage structures is based on Office of Surface Mining Regulations <br /> (Federal Register, March 1979) as well as on criteria described in this report. <br /> Haulage Road System <br /> The haulage road system is composed of seven (7) identifiable dirt road segments <br /> designated A, B, C, D, E, F, and G, and shown in Figure 1 and Plates 2 through <br /> 7. <br /> Road Plate No. Description <br /> A 2 Main arterial road for all mines. <br /> B 2 Collector road From Mines 1, 2, and 4. <br /> C 3 Lateral road from Mine 4 <br /> D 4 Lateral road from Mines 1 and 2 <br /> E 5 Collector road from Mines 3 and 5 <br /> F 6 Lateral road from Mi nee-` ' . � <br /> G 7 Lateral road from Mine 5 <br /> 3 <br /> 10 <br />