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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
2423Underflow density currentsThe density currents flowing under another fluid......
2428Underflow turbidity currents - plunging typeFlow of the turbid water into a reservoir plunging directly under the clear water in the lake. The formation is indicated by the collection of flowing.....
2429Underflow turbidity currents - settling typeWhen the inflowing muddy water does not dive under the clear water but pushes it downstream and forms a considerable body of muddy water and the sedim.....
2427Underflowing turbidity currentsIt is the common type of density currents that move down the bottom of a reservoir, lake or deep channel due to a greater density of the turbid water .....
8892Underground water basinA valley area or plain underlain by groundwater that has established an operational regime from the prevailing hydrologic and climatic conditions to b.....
6676Undergrowth The shrubs, sprouts, seedlings, sapling trees, and all herbaceous plants in a forest......
5853UnderpinningThe adding of new permanent support to existing foundations, to provide either additional capacity or additional depths......
2212Undershot type regulatorA regulator where the water passes from the parent channel to the offtaking channel between the sill of the gate opening and the lower edge of the gat.....
4585Undershot water wheelA water wheel moved by water passing beneath and striking against curved blades set in the outer rim......
2235Undersluices pocket, Pocket, or Scouring sluices pocketThe portion of river channel upstream of the undersluices bounded by the divide wall, inlet of the head regulator structure and the undersluices (illu.....
2234Undersluices, Sliding sluices, or Scouring sluices1 - Gated openings provided in a weir, dam or a barrage having its sill at a level lower than the remaining portion to discharge water as and when req.....
4711Undertree sprinkler methodSprinkler method used in orchards with small sprayers with outstretched jet in order not to wet the leaves and avoid the wind effect on the distributi.....
2669Undisturbed sampleA soil sample that has been obtained by methods where every precaution has been taken to minimize disturbance to the sample......
3352Undular jumpA type of hydraulic jump in which the water surface shows undulations. The Froude number of incoming flow is generally between 1 and 1.7 (illustrated).....
1798Unfilled porosityThe fraction of the soil space occupied by the gaseous phase alone......
3533Unflumed fall, or Unflumed dropA fall or drop in which the throat width is not less than the designed bed width of the channel downstream of the fall......
8311Unformatted disk, uninitialized diskA blank magnetic disk with no track/sector identification recorded on it that allows users to implement their own track/sector identifications......
972Ungauged basin, or Ungaged watershed (US)Drainage basin of which no regular hydrological records are available......
8312UnicodeA 16-bit character set standard, designed and maintained by the non-profit consortium Unicode Inc. Originally Unicode was designed to be universal, un.....
410Unified atomic mass unitThe unified atomic mass unit is equal to 1/12 of the mass of an atom of the nuclide 12C......
8797Unified river basin developmentIntegral river basin development as well as development of the area affected in other fields so as to utilize, to the best possible extent, the servic.....
3007Uniform channelA channel whose cross section does not change along its length, is straight in alignment and has a constant grade......
3015Uniform flowThe flow in an open channel with parameters, such as the cross-sectional area, the velocity and the hydraulic slope, remaining constant from section t.....
5286Uniform flowChannel flow with the depth, cross-sectional area, velocity and hydraulic slope remaining constant from section to section......
5445Uniform soilSoil when only one particle size and one soil material extends throughout one bed or layer of soil......
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