The Oct 2019 rainfall all over India was 109.7 mm, 44% above normal expected rainfall of 76 mm, following 53% above normal in Sept 2019. The rainfall this month has been unusual and has had some major impacts. One of the reasons has been that the SW monsoon withdrawal continued well into Oct 2019, when it almost always gets over by the end of Sept. There were also several cyclonic circulations and depressions mostly from Arabian sea. Continue reading “44% above normal rainfall in Oct 2019 creates hopes for Rabi, Disaster for Kharif crops at many places”
Central Water Commission (CWC) is the only agency doing flood forecasting in India. CWC’s Flood Forecasting (FF) is available on its website[I]. In this article we have given an overview of CWC’s flood forecasting and monitoring sites in East India. It includes state wise list of CWC’s Level Forecast, Inflow Forecast and level monitoring sites in East India. Similar report has been published for North India[II] and North East India[III] and we hope to publish reports covering other regions of India soon. East India includes five states: Bihar, Jharkhand, Chhatisgarh, Odisha and W Bengal.
The first blog on just concluded South West Monsoon 2019, gave the national picture and broad picture of month wise, state wise, sub division wise and river wise rainfall. This blog provides some details of rainfall in districts of each of the 36 states and Union Territories (UTs) of India. Continue reading “Monsoon 2019: State wise rainfall”
Bihar Unsustainable sand mining causing floods in West Champaran The sand mining in the rivers of West Champaran was causing unmitigated floods in the region, year after year but the govt failed to respond.
– West Champaran district also sees many floods in the non-monsoon months, many of which go unreported, and often, ignored by flood-relief schemes. The natural explanation for the flash floods is that the region is at the foothills and rivers from the hills of bordering Nepal flow through it. But the floods are not entirely a result of natural phenomena. Over the years, excessive sand mining in the river beds has led to ecological imbalances, making rivers and streams flood and even change their course, wreaking havoc in the villages along their banks.
(Feature image showing preparation of Kumbh 2019 at Prayagraj by Siddharth Agarwal of Veditum)
EDIT article in SCIENCE magazine by TUSHAR SHAH and others on Ganga: “The quickest, cheapest, and most effective way for Mr. Modi to show a less polluted Ganga by 2019 would be operating dams and barrages in the Ganga basin with the sole objective of augmenting river flows. This would be a start to controlling discharge of untreated sewage and industrial waste, which will take a long time.” http://science.sciencemag.org/content/362/6414/503 (2 Nov. 2018)
DOWN TO EARTH says about Ganga: “the river will continue to run as – and even more – polluted as ever… Till August 31, 2018, only a little more than a quarter of the total number of projects sanctioned under it (Namami Gange) had been completed… according to CPCB’s Water Quality Map, only five out of the 70-odd monitoring stations on the river had water that was fit for drinking; only seven had water that was fit for bathing…”
-“Down To Earth quotes a study report and CPCB data to say that the actual measured discharge of wastewater into the Ganga is 123 per cent higher than what has been estimated…”
-“Numerous hydroelectric projects on the Bhagirathi and Alaknanda have turned the upper stretches of the Ganga into ecological deserts, says the Down To Earth assessment. The baseflow amount of the river has decreased by a huge 56 per cent in 2016, as compared to the 1970s.”
– “about 180 MLD of sludge will be generated in the five Ganga Basin states (Uttarakhand, Uttar Pradesh, Bihar, Jharkhand, West Bengal) when they become ODF. If proper sludge management is not done, this would invariably pollute the Ganga. What should cause further concern is that faecal sludge is a bigger pollutant than sewage – while BOD of sewage is 150-300 mg/litre, that of faecal sludge would be 15,000-30,000 mg/litre.” https://www.cseindia.org/ganga-may-not-flow-clean-in-the-near-future-says-new-analysis-9085 (30 Oct. 2018)
Meanwhile, a new CAG report reveals that almost 26 million litres of untreated sewage still flows into the Ganga every day in Uttarakhand. https://www.downtoearth.org.in/news/water/uttarakhand-has-failed-to-rejuvenate-the-ganga-through-namami-gange-62027 (2 Nov. 2018)
Central Water Commission is the only agency doing flood forecasting in India. As per CWC’s Flood Forecasting website[I] the Data Flow Map has information about 226 Flood Forecast Sites in the country comprising of 166 Level Forecast Sites and 60 Inflow Forecast Sites. It also monitors 700 Flood sites, information made available through List Based Exploration and Hydrograph View, but no flood forecasting is done for these sites.
In order to better understand the CWC’s flood monitoring and forecasting work, in this article we have given an overview of CWC’s flood forecasting and monitoring sites in East India. It includes state wise list of CWC’s Level Forecast, Inflow Forecast and level monitoring sites in East India. Similar report has been published for North India[II] and North East India[III] and we hope to publish reports covering other regions of India too.
Following heavy rainfall, on August 17, 2016, Chandil dam, Jharkhand released huge amount of water in Subarnrekha River. As a result there was sudden surge of waters in Subarnrekah River causing worrisome situation in Jamshedpur town and in areas further downstream along the river in West Bengal and Odisha States.
Superficially the incident may appear a natural incident. But analysis of available information indicates that the flood impact could have possibly been reduced or avoided.
The incident:- On August 17 and 18, 2016, the ongoing South West Monsoon brought heavy rainfall in Jharkhand. The evenly distributed showers were measured as 80 mm across the State with Jamshedpur town located on the bank of Subarnrekha River recording maximum rainfall of 270 mm in 24 hours.