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<br /> 6) The embankment volume is approximately 35,000 cy. At $20/cy the <br /> embankment cost is $0.7 million. <br /> <br /> 7) The emergency and principal spillway structures are estimated to cost <br /> $0.5 million. <br /> 8) The total initial cost to provide the retention of the 100-yr storm runoff <br /> on the 20-acre farm is the lost use of nearly 6 acres and approximately <br /> $2.5 million to install the stormwater retention basin. Other long-term <br /> costs will be operation and maintenance of the basin, including <br /> sediment removal and periodic inspections. Due to the hazards <br /> presented by the storage volume, liability insurance premium costs for <br /> the farm will likely rise. <br /> 9) If the embankment rises above 25 feet or the storage volume exceeds <br /> 50 ac-ft (16.3 million gallons), the dam structure will fall under the <br /> regulation of the State of Hawaii. Smaller dams with appreciable <br /> downstream hazards such as highways or development will also need <br /> to meet the state's dam safety requirements, which include a more <br /> stringent application process, increased design and construction <br /> requirements, preparation and implementation of an emergency action <br /> plan, and periodic government inspection of the structure. <br /> <br />