farmfriend
farm friend is easy to use water pump and tank. it doesn't need any fuel. costs low for manufacture.

Solution

farm friend can be made out of PVC and polythene or other suitable clothes. it functions with springs. due to the extension of spring it gains energy while releasing it transfer the energy. this spring energy helps to move PVC walls which decrease and increase the volume of pump. when increasing the volume the water gets in to tank and pumps out to the field while decreasing the volume. here the farmers just needed to tight and loose the spring at the start and at the end. also to close the input canal and output canal. according to size it can hold more volume more than 8 meter cube

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