Rainfall

District wise Winter 2021 Rainfall in India

In the just concluded Winter Season (Jan 1 2021 to Feb 28 2021), as per India Meteorological Department (IMD), India received 32% below Normal Rainfall. The Normal rainfall in this two-month season is supposed to be quite low at 40.8 mm, but the actual rainfall was just 27.8 mm, which means rainfall was less than 0.5 mm per day in the season. Out of this the Rainfall in January 2021 was 20.2 mm, 17% above the normal rainfall of 17.3 mm. So in February 2021, the rainfall was 7.6 mm, against the normal rainfall of 23.5 mm, so the February rainfall was 68% below normal!

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Rivers · Yamuna River

HOW CAN DELHI TACKLE HIGH AMMONIA CONTENT IN ITS DRINKING WATER?

Guest Article by Manoj Misra

Note: This article is dedicated to the memory of Prof. Brij Gopal who introduced me to the concept of stream standards as different from effluent standards and often lamented former’s absence from our current water pollution control mechanisms. Prof. Gopal passed away suddenly in Delhi on 4 January 2021.   

Public Health demands use of ‘Stream’ standards alongside ‘Effluent’ standards – Law provides for it but the authorities have failed to implement.

Is the city of Delhi condemned to suffer high ammonia content each winter in its drinking water supplies from River Yamuna?

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Rainfall

Post Monsoon 2020: State wise Rainfall

According to India Meteorological Department (IMD), during the just concluded Post Monsoon Rainfall for 2020, that included rainfall during Oct-Dec months, India received 124.6 mm rainfall, 0.64% above the normal rainfall of 123.8 mm during the period. As per IMD[i] definition, the rainfall was thus normal.

This three-month period from Oct 1, to Dec 31 includes the North East Monsoon that mainly affects parts of South India including Tamil Nadu, Puducherry, Rayalseema, parts of Karnataka and Kerala. IMD declared on Jan 1, 2021 that the of NE Monsoon ended on Dec 31, 2020 with normal overall rainfall: TN had 6% above normal, Karnatak 13% above normal, Puducherry 32% above normal, Andhra Pradesh 33% above normal. However, Lakshadweep had 9% below normal and Kerala 26% below normal. This monsoon provides 48% of the annual rainfall of TN so it is most imp for that state.

The rainfall revived only towards the end of November, mainly due to two consecutive cyclones — Nivar and Burevi — both of which developed in the Bay of Bengal. While Cyclone Nivar crossed the coast close to Karaikal near Puducherry and brought heavy showers for the east and coastal districts of Tamil Nadu, Cyclone Burevi weakened before it reached land.

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Rivers · Sand Mining

North India Sand Mining Dialogue under IRW 2020: Local communities need to have key role in governance

The Key message that came through from all the panelists and North India Sand mining presentation was that if we are to see any improvement in the murky state of sand mining that is a threat to everyone today, then we urgently need key role for the local communities and civil society in sand mining governance. The second loud & clear message was that the Supreme Order of 2012 on the need for environmental appraisal and clearance of sand mining leases stands violated in letter and spirit by the Union Government. These messages also provide us the way forward.

Continue reading “North India Sand Mining Dialogue under IRW 2020: Local communities need to have key role in governance”
Monsoon · Rainfall

Monsoon 2020: District Wise Rainfall

India received 957.6 mm rainfall in Just concluded South West Monsoon 2020, during the scheduled 4 month monsoon from June 1 to Sept 30, 2020. This is 8.74% above normal monsoon rainfall of 880.6 as per India Meteorological Department (IMD). This is considered ABOVE NORMAL rainfall, since rainfall is in the range 4-10% above Normal rainfall. This sounds good at national level, but the situation on ground could be very different, if we see the rainfall across the country.

It is noteworthy as per even IMD, monsoon has not yet withdrawn from most parts of the country. But IMD closes its monsoon rainfall account at 0830 hours on Sept 30, so all rainfall after that hour has to be counted in “Post Monsoon” rainfall book, even though the rainfall is very much part of monsoon as per IMD.

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CWC - Central Water Commission

North India; CWC Flood Forecasting Sites 2020; New Website Old Problems

Flood forecasting is an important activity during monsoon, considering the huge and increasing flood prone area, flood frequency, intensity and flood damages. Accurate and timely flood forecasting can hugely help reduce the damages due to floods. Central Water Commission (CWC) is the only agency responsible for flood forecasting in India. To understand the CWC’s flood forecasting better, we have compiled the list of the various flood, inflow forecasting sites and flood monitoring sites in India.

In this compilation, we have given state wise list of CWC’s level forecasting, flood monitoring and inflow forecasting sites in North India, comprising of Union Territories Jammu & Kashmir, Ladakh, Chandigarh, Delhi and states of Himachal Pradesh, Uttarakhand, Punjab, Haryana  and Uttar Pradesh. It includes available details like name of river, sub basin, Warning level (WL), Danger Level (DL), High Flood Level (HFL), Full Reservoir Level (FRL), Maximum Water Level (MWL), as applicable. As we see below, there are many gaps in this basic information for the sites that are part of CWC’s list. A similar zonewise overview of CWC’s sites was compiled in 2018 and 2019, which can be seen here: Overview of CWC Flood Forecasting Sites 2018: North India; Overview of CWC Flood Forecasting Sites 2019: North India. We have brought this updated compilation for 2020 as there are large number of changes.

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Delhi · Rivers · Urban Rivers

NAJAFGARH JHEEL – SAGA OF A FORGOTTEN RIVER

Guest Article by: Ritu Rao

A short drive on the Golf Course Road in Dwarka followed by a turn towards Goyla Dairy and subsequently a sharp left just short of Goyla Dairy brings us to the famous Inspection Road /Embankment Road. Flanked by Najafgarh Drain on one side and the arable lands of Delhi on the other, the embankment road was constructed after the 1964 floods of Delhi. The thick mud embankments are covered with trees and shrubs which provide the much-needed habitat for the local flora and fauna to thrive. This thicket starts clearing off after Jhatikara crossing (say after about a half an hour drive on this road) and the Najafgarh drain suddenly transforms into a vast expanse of water known as the Najafgarh jheel. This spectacular sight continues for a good 5-6 kms before it once again narrows down into a stream. The road meets the now extinct Sahibi Nadi and Outfall from Drain No.8 at Dhansa, 5 km upstream of the jheel. The Sahibi Nadi which originates in Jaipur district and drains parts of Rajasthan, Haryana and Delhi, now has diminished flow and disappears in the arid soil near Dharuhera after the Masani Barrage in Haryana. Once fed by the Sahibi nadi and storm water runoff from the surrounding areas, the Najafgarh jheel is now fed primarily by the waste water from the Badshahpur Drain and the Outfall Drain No.8 and the rain water in monsoons.

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Indian Meteorological Department · Monsoon · Rainfall

District wise rainfall in June-Aug 2020 in India

In the ongoing South West Monsoon, India received 44 year old high surplus rainfall of 327 mm in just concluded Aug 2020, 26.6% above normal rainfall of 258.2 mm. This helped the total June-Aug 2020 rainfall to achieve 10% surplus, with actual rainfall 780.3 mm, 69.9 mm higher than normal rainfall of 710.4 mm. In June the country received 18% above normal rainfall and in July it received 9.9% below normal rainfall, the rainfall at the end of June was just 1.1 mm above normal. Thus almost the entire surplus rainfall is thanks to the rainfall during Aug 2020. The rainfall distribution has however, been far from normal that these figures suggest, as we can see from the state wise and district wise figures below.

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Monsoon · Rainfall

District wise Rainfall in India in June July 2020

During the just concluded first half of the South West Monsoon 2020, India received 453.3 mm rainfall, just 1.1 mm above the normal rainfall of 452.2 mm during the period. The Surplus of  18% rainfall that India received in June 2020 has thus been wiped out by the 9.9% deficit in July rainfall. Normal rainfall in July 2020 is 285.3 mm, while actual rainfall was 257.1 mm. IMD does not provide monthly figures of rainfall for different states, sub divisions and river basins, which it should along with comparison with respect to normal rainfall and rainfall last year.

To get July 2020 rainfall, we will need to use the figures given in this article along with the figures of June 2020 rainfall (see: https://sandrp.in/2020/06/30/district-wise-rainfall-in-india-in-june-2020/). The district wise figures of June-July 2020 rainfall can be seen in this PDF file from IMD: IMD DISTRICT WISE RAINFALL FROM JUNE 1 TO JULY 31 2020.

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DRP News Bulletin

DRP NB 27 July 2020: China’s Three Gorges Dam may be safe for now, but at what cost?

International media has been full of stories this last few weeks, about the likely fate of the world’s biggest dam project: The Three Gorges Dam of China. The stories ranged from possible imminent threat of collapse of the dam to those from China that rubbished all such ideas. Part of it was fuelled by the World’s anti China mood due to the Covid and its expansionist activities including at Indian borders. But part of the reason was the difficulty to getting hard facts, since China does not have free media or democracy and suppresses any critical information. One direct evidence of this Chinese tendency was apparent when Reuters was the first one to publish on July 22, 2020, the story of a dam collapse in China on June 7, full 45 days after the event and even that story could not find any official to quote about the dam collapse. A more telling example of China’s tendency to suppress basic facts would be difficult to come by from recent times. Continue reading “DRP NB 27 July 2020: China’s Three Gorges Dam may be safe for now, but at what cost?”