Water Yield

Water Yield


the ability of rocks saturated to their full moisture capacity to give up part of the water by free flow under the influence of gravity.

The water yield equals the difference between the absolute and the maximum molecular moisture capacity. The amount of gravity water (that is, the water able to move in interconnecting pores, cavities, and cracks under the influence of gravity) in liters that can be obtained from 1 cu m of rock is known as the specific water yield. The water yield of rocks is denoted by the water yield coefficient, expressed as a fraction or a percentage. Average water yield coefficients are 0.10-0.15 for sandy loam and fine sand, 0.25-0.35 for coarse sand, 0.02-0.03 for sandstones, and 0.008-0.10 for fissured limestones. The level of the water yield coefficient depends on the grain-size distribution and porosity of the rock, as well as on the viscosity of the water. Water yield is determined by laboratory techniques or calculated from observations of water flow, trial pumpings, and data on the utilization of ground water.


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The watershed referred to under the IRR of RA 7942 is 'critical watershed,' which means a drainage area of a river system, lake or water reservoir supporting existing and proposed hydroelectric power, domestic water supply, geothermal power and irrigation works that need immediate rehabilitation and protection to minimize soil erosion, improve water yield and prevent possible flooding.
We have solicited funding to augment daily water yield from available boreholes,' he said.
S Clamp of Required dla to the Top of easing Housing Pipe of tube well,Development of tube well in Accordance with establish maximum Rate of usable water yield without sand content (beyond permissible Iimit) with Required capacity Air compressor running the compressr for, Required time till well Is fully developed,Providing and fixing suitable size threatend mild steel cap or spot welded plate to the top of bore well housing rasing pipe Removable.
This process required estimates of the existing land uses, literature-based estimates of nitrate-N concentrations in tile and subsurface water, and estimates of water yield to streams.
InVEST can assess the value of 18 different ecosystem services, including carbon sequestration, water yield, nutrient retention, and recreation and tourism.
Therefore, transient electromagnetic method (TEM) was proposed, and TEM data was processed to detect the water yield property of a targeted layer in the coal mine.
Hence under normal conditions the total water yield from Cauvery can only be maintained but cannot be increased; the chances are that it will be going on decreasing as the years go by as is happening in all the rivers in our country.
1997, 2000a), water yield assessments for agriculture, urban and environmental requirements (Hawkins 1993) and as an input variable for water quality models and the design of monitoring programs (Fentie et al.
The cumulative water yield from the thousands of wells being flared can meet 11 percent and 65 percent of the water consumption in the Eagle Ford and the Bakken, respectively.
The multi-use project will save the island 236,107 litres of diesel fuel, equivalent to $272,940 in annual savings, and displace 652 tons of CO2 emissions every year, as well as increasing the rain water yield of the reservoir by six per cent.
At Plynlimon in Wales, Balquidder in Scotland and Coalburn in north east England , the Institute compared the amount of water yield from an extensive upland conifer forest canopy, with that from a similar adjoining but unafforested area.
2% increase in the surface runoff and water yield respectively, expansion of forests areas from 46% to 66% indicated 9.

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