![]() Even theconveyance efficiency of lined canals may decline over time due to material deterioration or poor maintenance.Īpplication efficiency relates to the actual storage of water in the root zone to meet the crop water needs in relation to the water applied to the field. Typically, conveyance losses are much lower for closed conduits or pipelines compared with unlined or lined canals. ![]() The global E ccan be computed as the product of the individual component efficiencies, E ci, where i representthe segment number. V d= the volume of water diverted (m 3) from the source.Į calso applies to segments of canals or pipelines, where the water losses include canal seepage or leaks in pipelines. V f = the volume of water that reaches the farm or field (m 3), Mathematically it is represented as follows: It isdefined as the ratio between the water that reaches a farm or field and that diverted from the irrigation water source. The conveyance efficiency is used to measure the efficiency of water conveyance systems associated with the canal network, water courses and field channels. ![]() V o= volume of out flow from the reservoir V e = evaporation volume from the reservoir It is the efficiency with which water is stored in the reservoir. 28.1.Schematic water flow in irrigation drainage system. In order to meet the growing demands of water for food, environment, urban and industry, it is necessary to improve irrigation efficiency at all levels.įig. At the end of eighth plan, Planning commission estimated that with a 10% increase in the present level of water use efficiency in irrigation systems, an additional 14 Mha area can be brought under irrigation from the existing irrigation capacities. This gap of about 16%, is same as the irrigation potential created between 19. This is one of the reasons for increasing gap between irrigation potential created (102.77 M ha till end of 10 th plan 2007) and utilized (87.23 M ha). In India, overall irrigation efficiency of major irrigation projects ranges between 35-40%. The major causes for reduced irrigation efficiency include storage losses, conveyance losses and field application losses. In addition, losses can also occur during storage in case of pond, tank, or reservoirs. ![]() 28.1 shows components of water loss from source to point of application. Thus, water applied by the irrigation system and not being made available to be taken up by plant roots is wasted and reduces irrigation efficiency. Irrigation efficiency is defined as the ratio between the amount of water used to meet the consumptive use requirement of crop plus that necessary to maintain a favourable salt balance in the crop root zone to the total volume of water diverted, stored or pumped for irrigation. The term irrigation efficiency expresses the performance of a complete irrigation system or components of the system. ![]()
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