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<br />~ <br /> <br />CENTRAL CITY MASTER DRAINAGE STUDY <br /> <br />40 <br /> <br />SECTION 10. CONCLUSIONS <br /> <br />Conclusions of this drainage study are as follows: <br /> <br />1 <br />I <br />1 <br />1 <br />I <br />I <br />I <br />I <br />1 <br />I <br /> <br />. <br />~ <br /> <br />~ <br /> <br />A <br /> <br />A <br /> <br />~ <br /> <br />oJ <br /> <br />1. <br /> <br />Existing major and minor drainage system capacities on <br />both Eureka and Nevada Gulches are below less than <br />standard design. <br /> <br />2. <br /> <br />Both major drainage systems (flumes) can be improved to <br />reduce flood damage without major reconstruction. <br /> <br />3. <br /> <br />Detention storage on Central City owned land at the <br />Dorothy Lee placer site would reduce frequency of <br />flooding on Eureka Gulch. <br /> <br />4. <br /> <br />Sediment and debris cause significant potential for <br />damage from both gulches. <br /> <br />5. <br /> <br />Local drainage systems on both Eureka and Nevada <br />Gulches should be upgraded to reduce maintenance <br />requirements. <br /> <br />6. <br /> <br />Cost estimates for construction to improve major and <br />minor drainage on both gulches totals $519,800. <br /> <br />7. <br /> <br />Sediments from Nevada and Spring Gulches can be reduced <br />by stabilizing tailings and slopes, costing $222,000. <br /> <br />8. <br /> <br />The U.S. Environmental Prote~tion Agency Superfund <br />Program also has an interest in stabilizing areas of <br />Nevada Gulch and is presently studying engineering <br />solutions. <br /> <br />9. <br /> <br />An economic analysis demonstrates that benefits derived <br />from constructing the recommended drainage improvements <br />far exceed the costs. <br /> <br />HydroDynamics Incorporated <br />