(Feature Image: Pillar with flood level marked on the bank of Yamuna river at Old Railway Bridge level forecast site in Delhi. Source:- Sanchit Khanna/HT Photos)
During monsoon season, Centre Water Commission’s (CWC) carries flood monitoring and forecast work through a network of 332 stations[i] covering 20 major river basins. The stations are comprised of Level Forecast (LF), Level Monitoring (LM) and Inflow Forecast (IF) sites. The LF sites have Warning Level (WL), Danger Level (DL), Highest Flood Level (HFL), date of HFL information while LM sites maintain HFL and HFL date records. At IF sites flood level for respective dams/ barrages with inflow, out flow figures are measured and forecast is issued accordingly.
However, there are plenty of concerns plaguing CWC’s flood forecast and monitoring work across country for years. In this 2022 SW monsoon season, the agency has exhibited one more problematic tendency which exhibits not only its careless approach vis-a-vis keeping accurate information of HFL breach events, but it also seems strange that it realises it has giving wrong HFL level and date information mostly only after crossing the HFL now.
Continue reading “Monsoon 2022: CWC Changing HFLs in Ad-hock Manner“
In the just concluded month of July 2022, the second month of India’s South West 2022 monsoon, India received 327.7 mm rainfall, 16.8% above the normal July rainfall of 280.5 mm as per India Meteorological department. In July 2021, the rainfall was 266.1 mm[i], about 6.7% below normal and in July 2020, the rainfall was 257.1 mm[ii], or about 9.9% below normal.
Continue reading “June July 2022: District wise rainfall in India’s SW Monsoon”
In the just concluded month June 2022, the first month of India’s South West 2022 monsoon, India received 152.3 mm rainfall, 8% below the normal June rainfall of 165.3 mm as per India Meteorological department. In June 2021, the rainfall was 182.9 mm[i], about 11% above normal and in June 2020, the rainfall was 196.9 mm, or about 18% above normal and in June 2019 it was 33% below normal.
Continue reading “June 2022: District wise rainfall in India’s SW Monsoon”
Guest Blog by Manoj Misra
It is no secret that the master key to Yamuna rejuvenation or for that matter any other perennial river is to make it flow as close to its natural flow pattern as possible. How to go about it is no rocket science but is no easy task either for we humans have burdened them with so many of our selfish stakes.
What flows in a river is not just water, but water enriched with energy, minerals, sediments, detritus and life, macro and microscopic plants and animals. It’s only such flow that enables and has enabled rivers over the millennia to fulfill various ecological (& social) functions like erosion and deposition of earth, meander and form floodplains, feed aquifers to replenish the ground water, host aquatic and riparian life forms, connect with the floodplain and its water bodies and complete the water cycle. (Feature image above: Dead Yamuna river at Panipat (Pic by Bhim SIngh Rawat))
Continue reading “Making Yamuna Flow Again”
In the just concluded month of July 2021, India received 266.1 mm rainfall, that is 6.73% below normal July rainfall of 285.3 mm, as per India Meteorological Department (IMD). This is in contrast with June 2021 rainfall, that was almost 11% surplus over Normal rainfall. Not only that surplus has been wiped out by the July 2021 deficit, the overall June July 2021 rainfall now is 449 mm, or about 0.7% below normal rainfall of 452.2 mm, as per IMD.
Continue reading “June July 2021 District Wise SW Monsoon Rainfall in India”
In the just concluded June 2021, the first month of India’s South West 2021 monsoon, India received 182.9 mm rainfall, 10.96% or about 11% more than the normal June rainfall of 166.9 mm as per India Meteorological department. In June 2020, the rainfall was 196.9 mm, or about 18% above normal and in June 2019 it was 33% below normal.
Continue reading “June 2021: District wise rainfall in India’s SW Monsoon”
In the just concluded pre monsoon season (March 1 to May 31, 2021) India received 155.2 mm rainfall, 18% above the normal rainfall of 131.7 mm as per the India Meteorological Department (IMD). This is similar to the case in 2020[i] when India received 158.5 mm or 20% above normal rainfall.
Continue reading “Pre Monsoon 2021 season – State Wise, District Wise Rainfall”
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!
Continue reading “District wise Winter 2021 Rainfall in India”
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?
Continue reading “HOW CAN DELHI TACKLE HIGH AMMONIA CONTENT IN ITS DRINKING WATER?”
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.
Continue reading “Post Monsoon 2020: State wise Rainfall”