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•t7 C3 3 <br /> m (o <br /> SUMMARY COMPARISON OF ALTERNATIVE RESERVOIRS <br /> Wcro <br /> (D ? <br /> ------•-----•--...-----••...................•---•-•-----....-------...•---------•----•---..•---•••-•--•••--••••••-•...._.. + <br /> SITE 8 SITE D 3 <br /> ENO RIVER ABOVE McGOWAN CR. SEVEN MILE CREEK <br /> -- r- <br /> EARTHFILL/ PHASE I PRASE I HILLSBOROUGH <br /> Line No. EARTNFiLL RCC DAM EARTHFILL RCC DAN RCC DAM .. coo X <br /> ..•...--••--------------- ------ --.. <br /> ............ ••••--•••••- <br /> 1. Drainage Area (square miles) 35.6 35.6 13.7 13.7 13.7 <br /> 576.5 576.5 585 585 601 <br /> 2. Normal Pool Elevation {Ft. MSL-} <br /> 3. Maximum Pool Elevation (Ft. MSL.) ', <'. 586.5 585 595 592 608 <br /> 4. TOTAL 20-year safe yield (MGD) 8.0 8.0 6.0 6.0 7.0 <br /> S. Preliminary Instream flow requirement (MGD) 1.9 1.9 1.1 1.1 1.1 <br /> 6. NET 20-year safe yield (MGD) • • - 6.1 6.1 4.9 4.9 5.9 <br /> 7. Total storage at normal pool (million galls) 1750 1750 2100 2100 4900 <br /> 8. Area inundated at normal pool (acres) 402 402 358 358 705 <br /> 9. Area inundated at maximum pool (acres) 664 618 558 495 915 <br /> 10. Property Acquisition <br /> a. Lend in reservoir area 664 618 440 380 780 <br /> b. Additional mitigation land 0 0 116 180 470 <br /> c. Buildings In reservoir area 11 11 1 1 13 <br /> d, Additional•buildings in critical area 7 7 2 2 12 <br /> 11. TOTAL PROJECT COST $19,192,000 $16,257,000 $17,365,000 $15,531,000 $25,428,000 <br /> 12. Comparitive cost per gallon of TOTAL yield $2.40 $2.03 $2.89 $2.59 $3.63 <br /> 13. Comparitive cost per gallon of NET yield••• $3_15•••-.•-•••$2_67 ••$3.54_._-.-.-$3_17 $4.31 <br /> ..............•••--_project.....•---------•--••••••--•--••---•• ..___..........._ <br /> 14. Previous total costs $17,700,000 •- 816,100,000 $13,917,000 $21,551,000 <br /> Line No(s). Notes' <br /> ----------- ..... <br /> 1. Drainage areas for the Eno River above McGowan Creek site includes 9.1 square miles controlled upstream <br /> by Lake Orange Dem. <br /> 4. All, safe yield estimates ere by Hazen and Sawyer. <br /> 5. Instreem flow requirements for the potential new reservoirs are the subject of ongoing discussions with the <br /> NC DNRCD Division of Water Resources and may be revised. <br /> 6. Net yield equals the estimated total yield minus the preliminary Instream flow requirement. <br /> I <br /> 10. The 160 acres already owned by the County at Seven Mite Creek are assumed to be available at zero cost for <br /> reservoir construction end/or environmental mitigation. <br /> 11. Project costs for the Eno River site include an allowance of $250,000 for historical mitigation and an <br /> additional allowance of $200,000 for increased operating expenses by the Orange-Alemance system during <br /> dam construction. <br /> 1 - <br /> 14. Taken from the Phase I study or letter report dated July 19, 1988 <br />