Surface Water

Floods: lessons to be learnt from the massive flooding in Surat city

A report by IIM criticises the way in which dams are managed in the country and calls for the need to apply Management Science / Operations Research techniques and information technology to improve dam management and prevention of floods

Flood fury: are we ready to face such an event?

This multi-location study by

Organizer: North East Centre for Environmental Education and Research, Imphal

Venue: Jaaga, Rhenius Street, Office Richmond Road, Opposite the Hockey Association Stadium main gate, Shanthinagar, Bangalore

Description:

The campaign is two year long awareness programme initiated by NECEER, Imphal for the conservation of Loktak Lake. More than 600 volunteers, 32 city Coordinators, Publicity Coordinator and 1 Worldwide Coordinator are involved in organizing this campaign. The campaign is to create awareness about the conservation of Loktak Lake, the largest fr...esh water lake in Northeast India. The lake was recognised as Ramsar site in 1990. Keibul Lamjao, the only floating national park in the world is situated at the south west part of the lake. It is home to the endangered Manipur brow antlered deer ‘Sangai’ - Cervus eldi eldi and many endangered species.

This report by the IES presents the findings of a study that explores the likely impacts of the recent proposals in India to build a dam at Pancheshwar in the Himalayas on the river ecosystems and the surrounding areas and people involved. This dam will be the world's second tallest structure intended to harness hydroelectric power and water by controlling the flow of the Kali river and its tributaries.

The document argues that although there are many benefits of the dam in terms of energy and water, the wider ramifications of the dam and its consequences for the people staying around the area have not been thought about in the planning process. The planning process has not engaged local people in the decision-making process, there is paucity of published information and the environmental and social consequences have been considered belatedly in the planning process.

This document by the Department of Environment, Government of Tamil Nadu highlights the importance of the Kodaikanal lake as an important tourist destination and warns that this freshwater lake is under the threat of getting polluted and its biodiversity endangered.

The document presents the findings of the study that aimed at assessing the physico-chemical and biological quality of the Kodaikanal lake.

Evidence indicates that unrestricted tourism activities have led to high use of plastic bottles, glass bottles, plastic bags, causing high levels of pollution and silting of the lake. Damaged fibreglass boats left inside the lakes also pose a serious threat to the lake ecosystem.

This article is written in response to an earlier published article “Chasing a Mirage: Water Harvesting and Artificial Recharge in Naturally Water-Scarce Regions” in the Economic and Political Weekly and argues that the paper makes a number of assertions about small water harvesting systems, that are based on faulty assumptions and inadequate information.

This report deals with the social conflicts emerging out of the encroachments owing to the change in course of the Ganga upstream and downstream of the Farakka barrage. The barrage was built with the intention of diverting water into the Hugli river with a view to flush the sediment load into the deeper part of the estuary and revive the navigational status of Kolkata port. During the last three decades of its operation, the silt-management in the barrage was given scant or no attention. The sediment movement in the tidal estuary of Hugli is a function of a complex fluvial system that can hardly be governed by inducing 40000 cusec of water.

Integrated Hydrological Data Books are a compendium of important hydrological information of twelve non-classified basins (i.e., other than Ganga and Brahmaputra) consolidated at the national level by the Central Water Commission (CWC).

It covers basic hydrological data on gauge, discharge, silt, sedimentation and water quality collected on a regular basis by the CWC regional field offices, who document it in the form of a Water Year Book, Sediment Year Book and Water Quality Year Book. These along with the relevant land use statistics collected by the Ministry of Agriculture are integrated into this Data Book.

The information is of use to planners, researchers, policy makers and the public at large.

The study determines rates of sedimentation and estimates the useful life of Dal-Nagin lake situated in Srinagar, Jammu and Kashmir using radiometric techniques. In spite of various ecological problems the lake is the largest freshwater lake in India. It has four major sub-basins viz., Hazratbal, Bod Dal, Garibal and Nagin. The lake is fraught with the problem of growth of underwater weeds and increasing rate of sedimentation.

The study deals with the development of an operation policy for the Tawa dam. It adopts rule-curve based policy for conservation regulation of the dam developed for three levels viz. upper rule level, middle rule level (critical for irrigation) and lower rule level (critical for water supply and upstream use). The generated simulation model developed by the Water Resources System Group at the National Institute of Hydrology is used to simulate the system operation and to refine the rule curves.