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Penstock
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<p>A penstock is a <a href="/facts/Sluice/nzfw3RxJ">sluice</a> or <a href="/facts/Floodgate/5aKxz5pz">gate</a> or intake structure that controls water flow, or an enclosed pipe that delivers water to <a href="/facts/Hydro_turbine/asldvmcG">hydro turbines</a> and <a href="/facts/Sanitary_sewer/qMKCIW6M">sewerage</a> systems. The term is of Scots origin, and was inherited from the earlier technology of <a href="/facts/Mill_pond/D3xgMds7">mill ponds</a> and <a href="/facts/Watermill/UTvzQY8S">watermills</a>, with penstocks diverting pond waters to drive the mills. </p>