Method of harvesting storing rain water for 12 months water supply
If we exclude some regions like Rajasthan there, it is not Megharaja's fault, it is ours. The remaining thunderstorms, on an average,
averaging 1,150 millimeters a year, bringing a total of 9,000 billion cubic meters of water to India. More than half of this amount flows into the ocean in just 3 hours. We have built a total of 4,200 large and medium sized dams and barrages for the purpose of storing river water,
while ideally as much water as possible should be harvested / stored wherever it rains. It is a different matter that some dams have to be built for hydropower. Wouldn't it be better to carry out a mega project like the rest of Kalpsar and store the rain water in Uparvas instead of diverting the water from rivers like Sabarmati?
The work is not difficult. If the house has a roof, all that remains is to install a PVC pipe that drains the rainwater from the pipes. (See, figure below). The same method is used even if the roof is agaci and the building is multi-storey. An average of 5% of the rainwater on the roof or roof can be stored in such an underground tank.
The math of how much rainwater is stored in liters is like knowing - understanding. The important figure in this is the amount of rainfall. The last monsoon of 2017 was good in Gujarat. Rainfall averaged 118%. In Rajkot, however, only 100 mm of rain fell, which was 4 mm. Therefore, to calculate the water storage, let us calculate the minimum figure.
Suppose there is an annual rainfall of 50 millimeters (0.2 m), the roof area is 100 square meters and the storage efficiency is 5%. The calculation of how much rainwater can be stored per liter in the storage tank is simple.
Precipitation (millimeters) x Area of agassi (square meters) = amount of rainwater in liters Assume that the area of agassi is 10 square meters, then 60 x 100 = 30.0 liters Let some water flow in the early monsoon rains In addition, some of the water evaporates during extraction, so let's assume the efficiency of Agassi's water storage is 30% instead of 10%. According to this, 4,000 liters of water is stored.
Approximately 10 liters of water per person is used daily for drinking and cooking. A family of five consumes 20 liters of water daily at A, so the water required in 3 days of non-monsoon is 10 x 2 x 2 = 15.50 liters. On the other hand, if the reserve of rain water in the underground tank is almost three times and there are crores of houses in the country, then rainwater harvesting is not considered as a 'Jaldhan Yojana'.
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