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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
3847U-abutmentForm of abutment where the wing walls return at 90o......
4482U-PumpA reciprocating piston pump wherein the valves are placed in the piston and the flow through the cylinder is in one direction with no reversal......
6717Ubiquitous Plant or animal species capable of thriving under many environmental conditions......
658UK Gallonsimg:equations//631_658_e.jpg.....
2638Ultimate bearing capacityThe average load per unit of area required to produce failure by rupture of a supporting soil mass......
1778Ultimate pHThe pH after all diffusible anions and cations have been removed......
5538Ultra high-early strength cementA cement that hardens more rapidly than ordinary Portland cement, because of its extraordinary particle fineness......
6265Ultrasonic velocity sensor, or Ultrasonic flowmeterA microprocessor-based instrument that measures the velocity of flow at a certain depth by simultaneously transmitting ultrasonic pulses through the w.....
9366Ultraviolet (UV)-B RadiationSolar radiation within a wavelength range of 280–320 nm, the greater part of which is absorbed by stratospheric ozone. Enhanced UV-B radiation suppr.....
1822Unavailable soil moisture, or Unavailable waterSoil moisture held so firmly by molecular forces that it cannot ordinarily be absorbed by plant roots with sufficient rapidity to produce growth......
4901Unavoidable farm lossesPrincipally those losses which are due to normal field evaporation and deep percolation......
57Unbiased errorAn error that may be drawn at random from an error population with zero mean......
197Unbiasedness, or Unbiased estimateAn estimate is `unbiased` if the average of the sample estimates comes nearer and nearer to the true population parameter as the number of samples (al.....
4176Uncased wellA tubewell, such as in deep rock, with little or no casing. .....
8578UncertaintyOutcomes resulting from each course of action that are not explicitly known and to which probabilities cannot be assigned......
1145Unconfined aquiferAn aquifer in which the groundwater table is free to rise and fall according to hydraulic gradients......
5285Unconfined waterWater that is free flowing......
1142Unconsolidated aquiferAn aquifer comprised mainly of gravels or other porous materials that may not be structurally stable when penetrated by a well bore......
2659Unconsolidated undrained test, or Quick testA soil test when the time is not allowed for consolidation and the water content of the test specimen remains practically unchanged during the applica.....
8951Uncontrolled mosaicA mosaic in which the photographs have not been adjusted by reference to ground control......
2745Uncontrolled spillway, or Ungated spillwayA spillway the crest of which permits water to discharge, whenever the reservoir surface is higher than the crest......
5166Under inletAny device other than a well that admits groundwater to a drain pipe. In its usual form it consists of an opening filled with broken stone or gravel......
6677Under story A layer of foliage below the level of the main tree canopy......
6439Undercut-slope bankThe inside bank of a meandering stream that is eroded by stream action......
7788Underdrainage Removal of excess water from the soil by a subsurface system of drainage......
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