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• <br /> SEVEN MILE CREEK RESERVOIR <br /> COMPARISON OF H/S AND PRIDGEN DESIGNS <br /> 3.30.88 <br /> HAZEN/SAWYER PRIDGEN <br /> 1 . Stream invert feet 520 510 <br /> 2. Hgt of dam above ( 1 ) feet 74 87 <br /> 3. Total dam length feet 1 ,400 2,050 <br /> 4. Length of prin. spillway feet 100 1 ,800 <br /> 5. Length of aux. spillway feet 270 N/A <br /> 6. Top of dam elevation feet 596 597 <br /> 7. Max . flood pool elevation feet 591 600 <br /> 8. Normal pool elevation feet 581 597 <br /> 9. Total storage @ nor. pool MG 2,070 4,900 <br /> 10. Area inun. a normal pool acres 332 700 <br /> 11 . Area inun. O max. pool acres 525 760 <br /> 12. Total drainage area sq mi 13.7 13.7 <br /> 13. Estimated 20 yr safe yld. MGD 6.0 13.4 <br /> 14. Instream flow req. MGD 1 . 1 1 . 1 <br /> 15. Net 20 yr safe yield MGD 4.9 8.0 <br /> 16. Cost/gallon yield (net) $ 3.29 1 .96 <br />