Shet Tale
Government subsidy is available in some districts of Maharashtra. In which district you want to make it?
First you need to decide purpose and then what quantity of water you want to preserve. Make sure you have studies sources of water to fill in this Shet Tale. You can either harvest rain water or pump water from a seasonal water stream or bore/well. To use rain as source of water, make sure you understand catchment area, average rainfall in your area, type of soil, water flow etc. There are standard methods / formulae available to calculate the same.
It can be covered with plastic sheet (silpolin) or without. Note that Maharashtra government recently started subsidy for plastic sheet as well. If you want to carry out fish farming, it is better to not use sheet. If you use sheet, make sure there are no rodents, crabs in nearby area as they usually chew the sheet.
The location of Shet Tale has to be approved by agricultural department. You can make one at lowest ground level in your plot or at highest ground level and use siphon method to use water from it.
There are standard sizes prescribed by govt. You need to make one of these sizes. Most recommended height is 3 meter of which half can be dug below ground level and other half by making soil mound at the periphery.
Above was a brief information on various items to be considered. There are many other small but important factors to be considered here. Also I am sure you must be interested to know rough estimate of cost. We can discuss these over emails.