Is it necessary to construct all types of recharge structures in buildings?
Not necessary. In areas with alluvial sand, recharge structures would not be required unless the open spaces are covered with cement pavements. In other areas depending upon the area one or two recharge structures are enough to meet the requirement of an average sized house. Preference must be given to roof-top harvesting using existing open well. When roof-top harvesting using sumps and existing sumps and open well is practiced, it would take care of 60% to 75% of the rain water recharge in an ordinary/normal house. In such cases, one or two simple structures would suffice to harvest the rain water from the remaining open spaces around the building.
