Saturday 1 March 2014

Ancient techniques for rainwater harvesting

Talab/ Bandhis
Talabs were reservoirs. They could be natural, such as the ponds (pokhariyan) at Tikamgarh in the Bundelkhand region or could be man-made, such as the lakes in Udaipur. A reservoir area of less than five bighas was called a talai; a medium sized lake was called a bandhi or talab; bigger lakes were called sagar or samand. The pokhariyan served the purpose of irrigation and drinking. When the water in these reservoirs dried up, the pond beds were used for cultivation. 

Johads Johads, in Rajasthan,  were small earthen check dams built to capture and conserve rainwater, thus  improving percolation and recharging ground water

Baoris / Bers
Baoris or bers were community  wells, found in Rajasthan, that were used mainly for drinking. Most of them are  very old and were built by banjaras for their drinking water needs. They  could hold water for a long time because of almost negligible water  evaporation.


 
Jhalaras
Jhalaras were man-made tanks, found in  Rajasthan and Gujarat, essentially meant for community use and for religious  rites but not for drinking. Often rectangular in shape, jhalaras have  steps on three or four sides. They were ground water bodies which were built to  ensure easy and regular supply of water to the surrounding areas.
Water Temples or ‘Step Wells’
Another most unique example for  harvesting rainwater and providing water for drinking purpose in arid parts of  our country was the step well.
Step wells are also  called water temples of India. The idea to construct step wells  was initiated due to the need to ensure  water supply during the period of drought. Some of the step wells were dug very  close to tanks to get drinking water    throughout   the year. Step wells  are also called Vav, Vavadi, Bawdi, Bawri,  Baoli, and Bavadi   and can be found  in Gujarat and Rajasthan.
Adalaj-Vav is a  very popular step-well i.e. about 20 kms from Ahmdabad. It is made in the form  of a temple that ends into a well. The well is about six storeys below ground  level. Picture 6 illustrates the depth of the well. Agrasen ki baoli is one of them which situates in Delhi.


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