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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
597Head of water in metresimg:equations//596_630_e.jpg.....
598Head of water in metresimg:equations//596_630_e.jpg.....
2693Head raceA channel leading water towards a water wheel or water turbine; into the forebay......
3290Head reachThe portion of a principal or main canal, or branch canal from its source to the first offtake from it. In distributing canals the head reach implies .....
2210Head regulatorA structure built at the intake end of an open channel or at the head of a diversion canal (illustrated) for controlling/diverting the required quanti.....
3810Head roomThe vertical distance between the highest point of a navigating vessel and the lowest point of any protruding member of a bridge......
4726Head station, Head installation, Control head or Head unitAll the equipment installed at the upstream end of a pressurized irrigation system to fulfil such functions as starting and stopping, perhaps scheduli.....
3704Head wallA wall of masonry or concrete built at the upstream end of an outlet, parallel to the flow in the supply channel, containing the opening of the orific.....
4253Head-capacity curve for a wellThe graphical relation between rate of flow from a pumped well and the drawdown. Data is obtained by test pumping......
3168Head-discharge relationshipCurve or table which gives the relation between the head and the discharge in an open channel at a given cross-section for a given flow condition, e.g.....
3994Head-endersFarmers having their fields/farms located near the canal head or closer to the water distribution source in an irrigation system, thereby having an ad.....
6560Header1 - A structure installed at the head or upper end of a gully to prevent overall cutting. 2 - See 5855......
5855Header, or Header (pipe) line1 - Large pipe or main with which individual well points are connected. 2 - A manifold, or pipe, with branches......
5423HeadwallA retaining wall that may be constructed at each end of a culvert to minimise the length of pipe and erosion......
1378Headward erosion1 - The erosion of a stream bed by the action of scour at the bottom of a vertical cliff or waterfall where the flow of the stream plunges, causing un.....
3669HeadwaterWater level prevailing in the supply channel......
6437Headwater erosionErosion that occurs in the upstream end of the valley of a river, causing it to lengthen its course in that direction......
961Headwater storageWorks designed to store or otherwise retain  runoff, where it originates or as near thereto as practicable, to  reduce the crest downstream......
729Headwater, or HeadwatersThe upper reaches of a stream near its source......
5424Headworks1 - Storages and diversion structures at the upper end of a conduit or channel system. 2 - See 2207, 4625 and 6347. .....
6347HeadworksPrincipal structures and infrastructure used for storing and /or diversion / withdrawal of  water resource (storage dams, weirs, barrages , intakes on.....
2207Headworks, Diversion work, or Diversion structure1 - A term used collectively for all works, principal structures and equipment (weirs, barrages, dams including diversion dams, head regulators, river.....
7450HealthA state of being characterized by the absence of serious or chronic illness or disease......
2520HeartingThe portion of the main body of a dam not affected by atmosphere......
5717HeartwoodThe inner or hearting portion of wood in a tree or a log; usually of a darker colour......
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