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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
5835Open caissonA box, open at the top and bottom, sunk through water-bearing material to rock or hardpan, then sealed with concrete at the bottom, pumped dry, and fi.....
5054Open channel drainageDrainage accomplished by open channels or drains without use of subsurface drains......
3026Open channel flowFlow in a channel with a free surface in contact with the atmosphere; includes flow in pipes and closed conduits flowing partly full......
2879Open channel gateA gate that closes a channel or opening having a wetted perimeter consisting of two sides and a sill, the surface of the retained water being nearly l.....
1155Open conduit, or Open channelAny channel, natural or artificial, in which water flows with a free surface......
5172Open ditches, or Open drainsDrains open to the sky, which provide outlets for subsurface pipe drains, tile drains, or tributary ditches and remove surface water directly......
5133Open field drainOpen drain, trench or ditch acting as subsurface drain......
3734Open flow meterA meter fitted to the downstream head wall of the turnout pipe by means of brackets. The propeller drives an appropriate gear train with mechanical co.....
4019Open flow regulation, or Continuous scour regulationMethod of regulation of headworks with the under-sluices of the pocket being open, the canal is fed from a still volume of water through which running.....
3714Open flume outletA semi-module in the form of a weir with a throat contracted sufficiently to ensure a velocity above the critical and long enough to ensure that the c.....
4542Open impellerAn impeller without attached side walls......
4543Open impeller pumpA pump when the impeller vanes are without any shrouds; used for viscous liquids......
7787Open inlet drains Drains that receive at least part of their inflow from open channel or surface flow......
8585Open LoopA system that does not use feedback to control states or outputs of a dynamic system. Open-loop control is used for systems that are sufficiently well.....
2704Open pit settingA turbine setting that provides for installation of the turbine in an open pit horizontally or vertically with the turbine shaft passing from the pit .....
3729Open sluiceA non-modular sluice outlet......
8236Open SourceA method and philosophy for software licensing and distribution designed to encourage use and improvement of software written by volunteers by ensurin.....
2249Open weir, or Open diversion damA diversion weir across a river to produce least obstruction to the flow. It comprises undersluices and several other bays having falling shutters fit.....
4153Open wellA well large enough to allow a man to enter it and to descend in it to the water level......
5169Open-channel drainageDrainage accomplished by open channels or ditches......
6091Open-cutA method of excavation when the working area is kept open to the sky. Used to distinguish from cut and cover and underground work......
4177Open-end wellA well into which the water enters only through the open end of the casing; there is no screen or other device used to exclude sand in this class of a.....
2294Open-jointed floorThe floor with open joints to relieve the upward pressure on the floor......
4415Open-well method, or Surge method A method of well development based on a combination of surging and pumping......
4798Opening torqueThe torque which, when applied continuously on the control rod, is just adequate for the full opening of a valve from a fully closed initial position......
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