Siphons: Difference between revisions
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[[Category:Water Conveyance]] | |||
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Many older dams were not constructed with a means of draining the reservoir. Lowering the reservoir may be needed for temporary construction, for emergency response, or when regular releases aren't needed. Siphons can be a low-cost means of providing a reservoir outlet if one does not exist. The key operational parameters are: (1) the required hydraulic lift cannot exceed the effective local atmospheric pressure adjusted for vapor pressure and frictional losses; (2) the discharge point of the siphon must be lower in elevation than the body of water to be siphoned; (3) the pipe or hose used for the siphon must be designed to operate at less than atmospheric pressures; (4) siphon outlets should only be used when there are no other feasible options; and (5) siphon outlets are difficult to prime. | Many older dams were not constructed with a means of draining the reservoir. Lowering the reservoir may be needed for temporary [[construction]], for emergency response, or when regular releases aren't needed. Siphons can be a low-cost means of providing a reservoir outlet if one does not exist. The key operational parameters are: (1) the required hydraulic lift cannot exceed the effective local atmospheric pressure adjusted for vapor pressure and frictional losses; (2) the discharge point of the [[siphon]] must be lower in elevation than the body of water to be siphoned; (3) the pipe or hose used for the siphon must be designed to operate at less than atmospheric pressures; (4) siphon outlets should only be used when there are no other feasible options; and (5) siphon outlets are difficult to prime. | ||
==Examples== | ==Examples== | ||
Revision as of 02:51, 18 November 2022
Many older dams were not constructed with a means of draining the reservoir. Lowering the reservoir may be needed for temporary construction, for emergency response, or when regular releases aren't needed. Siphons can be a low-cost means of providing a reservoir outlet if one does not exist. The key operational parameters are: (1) the required hydraulic lift cannot exceed the effective local atmospheric pressure adjusted for vapor pressure and frictional losses; (2) the discharge point of the siphon must be lower in elevation than the body of water to be siphoned; (3) the pipe or hose used for the siphon must be designed to operate at less than atmospheric pressures; (4) siphon outlets should only be used when there are no other feasible options; and (5) siphon outlets are difficult to prime.
Examples
Get answers to some of the common questions about siphons
Trainings
On-Demand Webinar: Design of Siphon Systems
Citations:
Revision ID: 4325
Revision Date: 11/18/2022