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The pipe extending through the dam
is termed the principal spillway. It is designed and sized to
release excess water in the reservoir in a controlled way. The
elevation at which it is placed determines the normal maximum
water level in the reservoir. |
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The principal spillway
in smaller watershed dams can run from an 18 corrugated iron tube
to a 48 concrete pipe. The principal spillway at HorseThief
Reservoir will consist of a 60 steel pipe, encased in concrete. |
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