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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
4200Uniformity coefficient A measure of the degree of uniformity of particle sizes in a granular material. Sometimes defined as: the quotient of the diameter of a grain of size.....
176UnimodalAn adjective describing a frequency distribution having a single mode......
2578Unit column method (for buttress dam)It is a method of designing a buttress dam evolved by Herman Shorer. It is assumed that the buttress comprises a series of hypothetical curved struts .....
923Unit hydrograph, or Unit graph (USA)Hydrograph of direct runoff resulting from a unit amount of effective rainfall generated uniformly over a watershed during a specified duration......
5021Unit irrigation efficiencyRatio of the sum of volume of irrigation water used in evapotranspiration in the specified area and that necessary to maintain a favourable salt conce.....
2609Unit seepage forceThe measure of seepage force, equivalent to the product of the hydraulic gradient and the unit weight of water (or other fluid)......
9022Unit-price contractContract in which the payment for the work is to be made on the basis of the computed quantities of specifically stated items of work actually perform.....
9367United Nations Framework Convention on Climate Change (UNFCCC)1 - The Convention was adopted on 9 May 1992, in New York, and signed at the 1992 Earth Summit in Rio de Janeiro by more than 150 countries and the Eu.....
8990Units of projectA primary minor head under which a group of individual works in a project are arranged to facilitate preparation of estimates, financial control and s.....
6118Universal machineA machine capable of being converted for various purposes by replacing one or more durable parts......
8313Universal Serial Bus (USB)An external peripheral interface standard for communication between a computer and external peripherals over an inexpensive cable using biserial trans.....
8514UNIXAn operating system that many computers on the Internet, including many web servers use. .....
4159Unlined well, or (Indian) Kacha well A percolation well whose sides are not protected by artificial steining. The local name for such wells in India is kacha well......
9181Unpaid family labourThe value of the unpaid manual labour of the operator and of the members of his family determined on the basis of what it would cost to have the same .....
9102Unproductive workA term in use in India and Pakistan. Work that yields or will yield a net revenue less than the percentage fixed for productive work......
1801Unsaturated soil1 - Soil having the pore spaces only partially filled up with water. 2 - See 1771......
1771Unsaturated soil solution1 - A soil solution having hydrogen ions among the cations in its exchange complex. 2 - See 1801......
5287Unsaturated zoneThe zone above the groundwater table, where the pores are partially filled with water and partially filled with air......
3009Unstable channelAn unlined channel which either silts or scours over a prolonged period......
1886Unstable humusReadily decomposable part of humus, corresponding approximately to that soluble in 80 per cent sulphuric acid......
5167Unstable soilSoil that does not have a significant amount of internal shear resistance (See 5079)......
3020Unsteady non-uniform flowA flow where the velocity varies both, with distance and with time; the velocity of the fluid particles changes from point to point, and the velocity .....
8314UpdateTo modify a master file with current information according to a specified procedure......
4678UplandTerrain above the lowlands of river valleys......
2283UpliftThe upward pressure in the pores of a body (interstitial pressure) or on the base of a structure......
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