started contact real impact site compliance ecoresidential projects housing colonies rooftop drainage residential institutional highly effective semiurban regions redirect rainwater growing concern groundwater depletion specialized solutions engineered systems water conservation water table recharge opportunities groundwater recharge solutions largescale percolation systems turning surface drainage reduce water dependency maintaining water availability allegiance water management recharge bore designs institutions recharge aquifers smart recharge zones collect surface runoff percolation pits compact ahmedabad vadodara surat