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A minor hydroelectric project is less than 100 theoretical horsepower in capacity and is eligible for a license under ORS 543.160. A minor hydroelectric license may be issued for a period of 20 to 50 years.
Theoretical horsepower (THP) is calculated by the water flow through the turbines in cubic feet per second multiplied by the head in feet (difference in elevation from the place where the water is diverted to the elevation at which it is released from the turbine) and divided by 8.8. (Water flow cfs * Head ft / 8.8) = THP
ORS 543.017 prohibits any hydroelectric development that may result in mortality or injury to anadromous salmon and steelhead resources or loss of natural habitat of any anadromous salmon and steelhead resources. All hydroelectric development must be consistent with the Columbia River Basin Fish and Wildlife Program adopted by the Northwest Power and Conservation Council. There may not be potential impacts that would result in a net loss of wild game fish or recreational opportunities. Protected areas for anadromous fish are shown on these maps
Other natural values in the project vicinity including water quality, wildlife, scenic and aesthetic values, and historic, cultural and archaeological sites shall be maintained or enhanced.
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