These schemes are constructed for utilization of ground water resources in areas where irrigation is not covered through surface water resources & where water table is usually more than 7 meters below ground level and electrically operated submersible pump sets are required to be used for lifting water.
These are capable of discharging 200 cubic meter per hour to irrigate and culturable command area of 40 hectares through under ground pipe lines emanating from an elevated distribution chamber. A large number of such structures are existing and are being operated by Govt. machinery. However as per policy of the State these type of structures are being handed over to the users for subsequent operation, management & maintenance.
These are capable of discharging 100 cubic meter per hour to irrigate and culturable command area of 20 hectares through under ground pipe lines emanating from an elevated distribution chamber. A large number of such structures are existing and are being operated by Govt. machinery. However as per policy of the State these type of structures are also being handed over to the users for subsequent operation, management & maintenance.
These structures are suitable for areas where water table is usually more than 7 meters below ground level and electrically operated submersible pump sets are required to be used for lifting water. These are capable of discharging 30 cubic meter per hour to irrigate an area of 4 to 6 hectares through open channels. These structures are installed in a cluster of 5 to 6 tube wells. It has been found that such structures can be managed very efficiently and economically by the users.
These structures are suitable for areas where water table is within 7 meters below ground level and water can be lifted with centrifugal pump sets run by electric motor set or diesel engines and thereby dependence on electricity can be avoided. These structures are suitable for the 6 Districts in the northern part of the State and part of Murshidabad District. Each of the tube well will be capable of discharging 30 cubic meter per hour to irrigate 4 to 6 hectares of culturable command area and it is possible to have 200% cropping intensity.
It covers ordinary open wells of varying dimension dug or sunk from the ground surface into water bearing stratum to extract water for irrigation purposes.These open dug wells are of 1.2 meters to 3.0 meters diameter for a depth of 8 to 12 meters appeox. Generally 1.2 dia. with R.C.C ring are constructed in alluvium formation and 3.0 metre dia. ODW are constructed in lateritic and hard rock formations. Water is being lifted manually and the quantum of water lifted is approx. 1.6 m³/ hour. The average culturable command area varies from 0.4 hectares to 1.5 hectares with 300 percent crop intensity of cultivable land.
