what do you mean by water havesting ? compare the traditional system of water harvesting between hilly areas and plains
Answers
Answer:
It means capturing rain where it falls or capturing the run off in your own village or town. And taking measures to keep that water clean by not allowing polluting activities to take place in the catchment.
Therefore, water harvesting can be undertaken through a variety of ways
Capturing runoff from rooftops
Capturing runoff from local catchments
Capturing seasonal floodwaters from local streams
Conserving water through watershed management
These techniques can serve the following the following purposes:
Provide drinking water
Provide irrigation water
Increase groundwater recharge
Reduce stormwater discharges, urban floods and overloading of sewage treatment plants
Reduce seawater ingress in coastal areas.
In general, water harvesting is the activity of direct collection of rainwater. The rainwater collected can be stored for direct use or can be recharged into the groundwater. Rain is the first form of water that we know in the hydrological cycle, hence is a primary source of water for us. Rivers, lakes and groundwater are all secondary sources of water. In present times, we depend entirely on such secondary sources of water. In the process, it is forgotten that rain is the ultimate source that feeds all these secondary sources and remain ignorant of its value. Water harvesting means to understand the value of rain, and to make optimum use of the rainwater at the place where it falls.
Explanation:
In plains, the water harvesting structures are crescent-shaped earthen embankments. These are low straight, and concrete. In hilly regions, the system of canal irrigation called Kuhl is used for water harvesting. This involves a collection of rainwater in a stream, which is then diverted into man-made channels down the hillsides.