The community needs to be actively involved in matters like water management and with the mushrooming of residential societies that often consist of several buildings under one management, such social movements are actually easier than what they used to be. There are times when the monsoon season arrives early and show no sign of ending and there are other times when it comes late and leaves early. The rain gods can simply not be trusted to stick to a regular schedule. There are years when there is plenty of rain and there are other years when the same place faces a drought. The citizens of most cities simply do not know when their dams and lakes will be overflowing with water and when it will be bone dry.
Rainwater harvesting is not a modern concept. It is actually an ancient process where villagers used to catch and store the water and preserve it for future use. There are numerous examples of manmade lakes and huge water tanks being constructed so that the village would not have to face a water shortage. The time has come for modern day cities to think like ancient villages and become self sufficient in natural resources like water.