Overflow water from Hand pump

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Hi friends, Today we get water from government supply.. We get water every day after day only 1 hour, per week three times. In this time we store water for my future purpose, in multiple home we have hand pump along with under ground tank for water savings. For cooking purposes I save some water, for that I open my gateway, suddenly it overflow. With out putting my effect I get water today. I am so happy, after saving how much water I need then again I close my gatewall because I don't wish to waste valuable water. Any one get overflow water in your area, what is your experience??