Abstract: Currently, global environments suffers from loads of rain which in terms of creates flood through urban areas and destroy surrounding as well as agriculture fields. Agriculture fields became too moisture and die of heavy fall rain which cannot be hold much longer for covering acres of areas within a short time period. What is the way to solve this kind of problem in the surroundings? We proposed a method, rain water harvesting and saving crop fields from heavy rain fall using rain drop detection sensor which senses rain and automatically send intimation back to our main board. Main controller board receive signal and precede an action to cover field, divert a way to store the water in to wells. Here, the diversion creates via. path predetermined to flow water on to that direction to save crop fields as well as save water for future proceedings. The implementation even research for city peoples where rain water sensor is implemented on the roofs. Whenever, rain senses it automatically opens a bridge connection between roof and wells. From there, the water is been diverted to well or reservoirs to harvest rain water securely without any manual research.