When the rainwater along with dirt & debris flows by gravity through the downtake pipes, it enters into the filter and starts rotating in anticlockwise direction at the periphery of the upper housing, this enables it to flow into the SS-304 filter element placed in the lower housing in angular motion at specific speed & velocity, which creates cohesive force at low intensity & centrifugal force at high intensity of rainfall. In both situations, involving low & high intensity of rainfall, the working principle of the filter based on cohesive & centrifugal force respectively, aids the filter element to flush out dirt & debris automatically. The water then passes through the drain outlet and simultaneously diverts clean water into the sump/ recharging well through the clean water outlet, which can be used for reutilization or recharging of groundwater source.
Objectives:
To develop a Point Source Artificial Groundwater Recharge structure which can recuperate dried bore wells within a very short timeframe employing an enhanced rate of recharge capturing the surface runoffs.
The V-Wire injection well technology invented by Farmland Rainwater Harvesting Systems in the year 2002 was significantly upgraded in the year 2007 due to constant research & development, both at the state of the art Hydraulic Research & Development Lab and at the field level. This technology is unique in many ways. It uses Gravitational Energy and the use of eco-friendly materials having a long-life span. The technology has gained wide spread acceptance by various Government Organizations in the State of Karnataka in Districts and Taluks which are highly drought prone, because of the positive results obtained in enhancing the water table in severely depleted areas. Hence, this technology has found wide acceptance in various Central and State Government sponsored sustainable schemes in providing water security for drinking and agriculture to the rural community in the drought-prone areas in many states of India. Because of the success obtained at the government level, the technology also gained ground in the private sector.
The system consists of a silt trap unit, a recharge well (5 to 6 meters with 20% filtration media consisting of crushed stone, gravels, coarse sand, activated carbon and charcoal; and the rest for storage of water) and a recharging bore (20 to 60 meters) at the bottom of the recharge well. The rain water is led through a water channel and first reaches the silt trap, which allows for silt to settle down in the chamber. The overflow water is led into the Injection Well fitted with the FL V-Wire filter unit through a horizontally connected pipe. It then passes through multilayer of filtration media placed at the top of the Injection Well.
The water accumulates below the filter media in a specially designed storage well, which creates a water column. The percolator pipe, attached to the non-clogging V-wire screen, is placed by boring through the permeable strata at higher depths of about 30 to 60 meters below the ground level. The water then passes through the permeable strata by gravity and reaches the dry joints, cracks, weathered zone; and recharges the aquifer holding the groundwater. The water also gets filtered while passing through the permeable strata.
Due to the installations of V-wire Injection Wells in many of the severely drought prone areas across the country, the groundwater table has significantly improved. The intervention through FL V-wire Injection Well technology led to hundreds of bore wells which had water tables more than 1000 feet below ground level being recharged to half their levels (450 to 500 feet). Due to acute shortage of power during the peak summer season, a vast majority of the farmers resort to diesel generators to pump out water. The energy requirement to pump out the water is directly proportional to the static head and quantum of water discharged, thereby significantly lowering the required pump capacity, with increase in water table and thus reduction in carbon emission.
