Rainfall and other forms of Precipitation

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Featured Articles
May 8, 2024
Ecosystem-based approach to water management: Key to Karnataka’s water future
What is the ecosystem based approach to water management? How can it help in solving the water woes of states in the Deccan Plateau?
An ecosystem based approach to water management (Image Source: India Water Portal)
January 25, 2024
Decoding the moody monsoon
This report by CEEW discusses the findings of a study on India’s first sub-district -level monsoon variability assessment to decode changing rainfall patterns across India during the southwest and northeast monsoon.
The moody monsoon (Image Source: Mayank Makhija via IWP Flickr photos)
August 16, 2023
Raindrops and Ripples
India Water Portal is hosting a photo competition on World Photography Day. Hurry, send us your photos before 31st August!
May 8, 2023
Adaptation and mitigation for monsoon extremes in the Indo Gangetic Plains
Warming will not only lead to a decline, but also trigger monsoon extremes in the Indo Gangetic Plains.
A woman wades through knee-deep water with her belongings. (Picture courtesy - 101Reporters) (Source: IWP Flickr photos)
May 4, 2023
The changing face of monsoon
Climate change is expected to have significant impacts on the Indian monsoon
As per the India Meteorological Department (IMD), instances of heavy rainfall have increased by almost 85% in the country since 2012 (Image: Marina, 2009,Wikimedia Commons)
April 4, 2023
Forests, water fountains of the skies
Forests greatly help in maintaining the water balance of nature by storing water during monsoons and making this water available during dry seasons. India urgently needs to save its forests to prevent droughts and the adverse effects of climate induced global warming.
Forests and soil moisture can act as buffers to store water during dry spells (Image Source: India Water Portal)
Map: Location of water resource projects across river basins in India
This map from the National Institute of Hydrology shows the location of the various water resources projects in each river basin in the country.
National Institute of Hydrology (NIH)
Posted on 20 Aug, 2009 03:23 PM

The map indicates that across the main 19 river basins of the country, water resource projects with a total live storage of 174 BCM (Billion Cubic Metres) have been completed, 75 BCM are ongoing, and 132 BCM are being planned.
Annual average availability of water for agriculture in India as of 1991
This map shows the river basin-wise annual average availability of water (in m3) for agricultural cultivation, as of 1991
Hydrology and Water Resources and Information System
Posted on 20 Aug, 2009 02:50 PM

/sites/default/files/iwp/Basin-wise%20annual%20average%20availability%20of%20water%20for%20agriculture_1991_NIH.jpg
Rashtrita Jal Chetna Yatra: Efforts of Tarun Bharat Sangh and Rajendar Singh in addressing water related concerns across the country
A detailed write up about the aims, aspirations and achievements of the Rashtriya Jal Chetna Yatra
Rashtriya Jal Chetna Yatra
Posted on 20 Aug, 2009 02:20 PM

Tarun Bharat Sangh and Rajendar Singh started a massive campaign to spread awareness of traditional water harvesting structures in order to restore the water resources of arid Rajasthan. The aim was to popularize the use of such traditional structures across the country.
Collection of articles on climate change with special reference to India
The following documents address various issues related to climate change, particularly highlighting the Indian context
India Water Portal
Posted on 20 Aug, 2009 12:36 PM

Climage Change, Indias perceptions, positions, policies and possibilities, written by Jyoti K Parikh and Kirit Parikh, Indira Gandhi
Chennai metropolitan area's water woes: CMWSSB's plans for the future
Steps outlined by the Chennai Metropolitan Water Supply and Sewerage Board to meet the water demands of Chennai city
Chennai Metropolitan Water Supply and Sewerage Board (CMWSSB)
Posted on 19 Aug, 2009 04:01 PM

CMWSSB or Metro Water was established in 1978 and serves 180 sq kms of area and 5.5 million population.
Physiographic rainfall variations across India: Thematic map from the Indian Institute of Tropical Meteorology
This map shows the recent rainfall trends, based on data from 1813 to 2006, and also shows monthly trends for the 4 main rainfall months of the year - June to September.
Indian Institute of Tropical Meteorology (IITM)
Posted on 19 Aug, 2009 03:59 PM

The map shows that there is a decreasing trend of rainfall over most of peninsular India (barring Maharashtra) including the western part of the Gangetic plain and the north eastern states apart from Assam.

An increasing trend of rainfall has been observed for the eastern part of the Gangetic plain, Assam, Telengana and all coastal regions of the country.
Map depicting areas prone to flooding in India
A map from Wikimedia Commons showing the areas frequently affected by floods in India
Wikimedia Commons
Posted on 19 Aug, 2009 03:48 PM

This map shows the regions in the country that are regularly affected by floods.

The major flood prone regions are Punjab, Haryana, most of the Gangetic plains including Uttar Pradesh, North Bihar and West Bengal, the Brahmaputra valley, coastal Andhra Pradesh and Orissa, and South Gujarat.
Rainwater harvesting basics: Filtering the water before storage and use
Filtering rainwater before storage is essentially to remove organic material and silt so that the water stays clean longer.
rajshekar
Posted on 19 Aug, 2009 03:29 PM

Overview

Rainwater is amongst the purest water one can get distilled as it is by the sun. However, in a rainwater harvesting system, the water comes in contact with several surfaces, such as the roof or gutters. Its flow becomes possibly mixed with leaves or dust.
Rainwater harvesting basics: How to direct roof top rainwater into the sump
This page provides you with the basics of how to direct the roof rainwater into the sump for effective storage
rajshekar
Posted on 19 Aug, 2009 10:00 AM

Overview
Toolkit on rainwater harvesting: Basics, overview and related technologies
Learn the basics of rainwater catchment systems, components, collection for domestic water supply and the socio-economic as well as health aspects
Rainwaterharvesting.org
Posted on 18 Aug, 2009 04:25 PM

Rainwater harvesting is an option which has been adopted in many areas of the world where conventional water supply systems have failed to meet the needs of the people. Examples of RWH systems can be found in all the great civilisations throughout history.

Here's an eToolkit on rainwater harvesting that tells you all that you need to know to harvest rain successfully.
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