Author: Sachin Gupta | Find me on Twitter Follow @sach_gupta
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Monsoon in India is one of the oldest weather observations which happen from June to September every year. It is a major weather phenomenon because of its influence on the lives of people and their well being.
Average rainfall across various Indian states is as follows:
As we all know, rain is the primary source of water while rivers, lakes and ground water are the secondary sources. Our daily consumption of water is fulfilled by secondary sources of water. However, these secondary sources of water are replenished by primary source of water (rainfall). Therefore, it becomes imperative for all of us to harvest this rain water in order to refill rivers, lakes, ground water.
Advantages of Water harvesting
An example,
Let’s take the case of Delhi; the average annual rainfall is 617 mm or 2.02 Ft. In a given area of 1 Ft by 1 Ft, the rain water that can be harvested every year will be 2.02 Cubic Feet or 57.21 liters. In other words, every household can harvest 57.21 liters of water in an area of 1 ft by 1 ft. If you have a roof of 50 ft by 20 ft, the water harvested would be 57206.4 liters.
Now, is this water harvested properly? Households, residential complexes, commercial complexes can harvest rain water by capturing runoffs from rooftops. The water thus captured can either be stored in a community water tank or allowed to go to the ground via a pipe which helps in refilling or increasing the ground water levels of a given region, thus, reducing the scarcity of water.
ACTION TAKEN BY VARIOUS STATEs / UTs / MUNICIPAL CORPORATIONS TO MAKE RAIN WATER HARVESTING (RWH)/ROOF TOP RAIN WATER HARVESTING (RWH) MANDATORY
Average rainfall across various Indian states is as follows:
| Sl. No. | State | Meteorological Divisions | Average annual rainfall (mm) | Average annual rainfall (ft) |
| 1 | Andaman and Nicobar Islands | Andaman and Nicobar Islands | 2967 | 9.73 |
| 2 | Arunachal Pradesh | Arunachal Pradesh | 2782 | 9.13 |
| 3 | Assam | Assam and Meghalaya | 2818 | 9.25 |
| 4 | Meghalaya | Assam and Meghalaya | 2818 | 9.25 |
| 5 | Nagaland | Nagaland, Manipur, Mizoram and Tripura | 1881 | 6.17 |
| 6 | Manipur | Nagaland, Manipur, Mizoram and Tripura | 1881 | 6.17 |
| 7 | Mizoram | Nagaland, Manipur, Mizoram and Tripura | 1881 | 6.17 |
| 8 | Tripura | Nagaland, Manipur, Mizoram and Tripura | 1881 | 6.17 |
| 9 | West Bengal | Sub-Himalayan West Bengal and Sikkim | 2739 | 8.99 |
| 10 | West Bengal | Gangetic West Bengal | 1439 | 4.72 |
| 11 | Sikkim | Sub-Himalayan West Bengal and Sikkim | 2739 | 8.99 |
| 12 | Orissa | Orissa | 1489 | 4.89 |
| 13 | Bihar | Bihar Plateau | 1326 | 4.35 |
| 14 | Bihar | Bihar Plains | 1186 | 3.89 |
| 15 | Uttar Pradesh | Uttar Pradesh | 1025 | 3.36 |
| 16 | Uttar Pradesh | Plain of West Uttar Pradesh | 896 | 2.94 |
| 17 | Uttar Pradesh | Hills of West Uttar Pradesh | 1667 | 5.47 |
| 18 | Haryana | Haryana, Chandigarh and Delhi | 617 | 2.02 |
| 19 | Delhi | Haryana, Chandigarh and Delhi | 617 | 2.02 |
| 20 | Chandigarh | Haryana, Chandigarh and Delhi | 617 | 2.02 |
| 21 | Punjab | Punjab | 649 | 2.13 |
| 22 | Himachal Pradesh | Himachal Pradesh | 1251 | 4.10 |
| 23 | Jammu and Kashmir | Jammu and Kashmir | 1011 | 3.32 |
| 24 | Rajasthan | West Rajasthan | 313 | 1.03 |
| 25 | Rajasthan | East Rajasthan | 675 | 2.21 |
| 26 | Madhya Pradesh | Madhya Pradesh | 1017 | 3.34 |
| 27 | Madhya Pradesh | East Madhya Pradesh | 1338 | 4.39 |
| 28 | Gujarat | Gujarat region | 1107 | 3.63 |
| 29 | Gujarat | Saurashtra and Kachchh | 578 | 1.90 |
| 30 | Goa | Konkan and Goa | 3005 | 9.86 |
| 31 | Maharashtra | Konkan and Goa | 3005 | 9.86 |
| 32 | Maharashtra | Madhya Maharashtra | 901 | 2.96 |
| 33 | Maharashtra | Marathwada | 882 | 2.89 |
| 34 | Maharashtra | Vidarbha | 1034 | 3.39 |
| 35 | Andhra Pradesh | Coastal Andhra Pradesh | 1094 | 3.59 |
| 36 | Andhra Pradesh | Telengana | 961 | 3.15 |
| 37 | Andhra Pradesh | Rayalaseema | 680 | 2.23 |
| 38 | Tamil Nadu | Tamil Nadu and Pondicherry | 998 | 3.27 |
| 39 | Pondicherry | Tamil Nadu and Pondicherry | 998 | 3.27 |
| 40 | Karnataka | Coastal Karnataka | 3456 | 11.34 |
| 41 | Karnataka | North Interior Karnataka | 731 | 2.40 |
| 42 | Karnataka | South Interior Karnataka | 1126 | 3.69 |
| 43 | Kerala | Kerala | 3055 | 10.02 |
| 44 | Lakshadweep | Lakshadweep | 1515 | 4.97 |
As we all know, rain is the primary source of water while rivers, lakes and ground water are the secondary sources. Our daily consumption of water is fulfilled by secondary sources of water. However, these secondary sources of water are replenished by primary source of water (rainfall). Therefore, it becomes imperative for all of us to harvest this rain water in order to refill rivers, lakes, ground water.
Advantages of Water harvesting
- Provides drinking and irrigation water.
- Increases groundwater recharge.
- Reduces storm water discharge, urban floods and overloading of sewage treatment plants.
- Reduces seawater ingress in coastal areas.
An example,
Let’s take the case of Delhi; the average annual rainfall is 617 mm or 2.02 Ft. In a given area of 1 Ft by 1 Ft, the rain water that can be harvested every year will be 2.02 Cubic Feet or 57.21 liters. In other words, every household can harvest 57.21 liters of water in an area of 1 ft by 1 ft. If you have a roof of 50 ft by 20 ft, the water harvested would be 57206.4 liters.
Now, is this water harvested properly? Households, residential complexes, commercial complexes can harvest rain water by capturing runoffs from rooftops. The water thus captured can either be stored in a community water tank or allowed to go to the ground via a pipe which helps in refilling or increasing the ground water levels of a given region, thus, reducing the scarcity of water.
ACTION TAKEN BY VARIOUS STATEs / UTs / MUNICIPAL CORPORATIONS TO MAKE RAIN WATER HARVESTING (RWH)/ROOF TOP RAIN WATER HARVESTING (RWH) MANDATORY
Have any Questions? Tweet to @sach_gupta









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