NDLI: Informed Decision Making Process for Managing Environmental Flows in Small River Basins

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Study of Climate Responsive Passive Design Features in Traditional Hill Architecture of Khyah Village in Hamirpur, Himachal Pradesh, India for Indoor Thermal Comfort

Journal of The Institution of Engineers (India): Series A : Volume 93

Informed Decision Making Process for Managing Environmental Flows in Small River Basins

Content Provider	Springer Nature Link
Author	Padikkal, S. Rema, K. P.
Copyright Year	2013
Abstract	Numerous examples exist worldwide of partial or complete alteration to the natural flow regime of river systems as a consequence of large scale water abstraction from upstream reaches. The effects may not be conspicuous in the case of very large rivers, but the ecosystems of smaller rivers or streams may be completely destroyed over a period of time. While restoration of the natural flow regime may not be possible, at present there is increased effort to implement restoration by regulating environmental flow. This study investigates the development of an environmental flow management model at an icon site in the small river basin of Bharathapuzha, west India. To determine optimal environmental flow regimes, a historic flow model based on data assimilated since 1978 indicated a satisfactory minimum flow depth for river ecosystem sustenance is 0.907 m (28.8 m$^{3}$/s), a value also obtained from the hydraulic model; however, as three of the reservoirs were already operational at this time a flow depth of 0.922 m is considered a more viable estimate. Analysis of daily stream flow in 1997–2006, indicated adequate flow regimes during the monsoons in June–November, but that sections of the river dried out in December–May with alarming water quality conditions near the river mouth. Furthermore, the preferred minimum ‘dream’ flow regime expressed by stakeholders of the region is a water depth of 1.548 m, which exceeds 50 % of the flood discharge in July. Water could potentially be conserved for environmental flow purposes by (1) the de-siltation of existing reservoirs or (2) reducing water spillage in the transfer between river basins. Ultimately environmental flow management of the region requires the establishment of a co-ordinated management body and the regular assimilation of water flow information from which science based decisions are made, to ensure both economic and environmental concerns are adequately addressed.
Starting Page	43
Ending Page	52
Page Count	10
File Format	PDF
ISSN	22502149
Journal	Journal of The Institution of Engineers (India): Series A
Volume Number	94
Issue Number	1
e-ISSN	22502157
Language	English
Publisher	Springer India
Publisher Date	2013-10-25
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Murray darling Ecosystem Environmental flow Civil Engineering River basins Bharathapuzha
Content Type	Text
Resource Type	Article
Subject	Building and Construction Architecture Mechanical Engineering Agricultural and Biological Sciences Civil and Structural Engineering

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