Design flow duration curves for environmental flows estimation in Damodar River Basin, India

Verma, Ravindra Kumar; Murthy, Shankar; Verma, Surabhi; Mishra, Surendra Kumar

doi:10.1007/s13201-016-0486-0

Cited by 37 publications

(19 citation statements)

References 20 publications

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“…The FDC is a plot of the observed historical river flow data collected with different temporal resolutions daily, weekly, monthly, seasonally, and annually at the gauge station and when that flow is equaled or exceeded [60][61][62]. The FDC is an informative method that shows the characteristics of flow.…”

Section: Discussionmentioning

confidence: 99%

Environmental Flows Assessment in Nepal: The Case of Kaligandaki River

et al. 2020

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Environmental flow assessments (e-flows) are relatively new practices, especially in developing countries such as Nepal. This study presents a comprehensive analysis of the influence of hydrologically based e-flow methods in the natural flow regime. The study used different hydrological-based methods, namely, the Global Environmental Flow Calculator, the Tennant method, the flow duration curve method, the dynamic method, the mean annual flow method, and the annual distribution method to allocate e-flows in the Kaligandaki River. The most common practice for setting e-flows consists of allocating a specific percentage of mean annual flow or portion of flow derived from specific percentiles of the flow duration curve. However, e-flow releases should mimic the river’s intra-annual variability to meet the specific ecological function at different river trophic levels and in different periods over a year covering biotas life stages. The suitability of the methods was analyzed using the Indicators of Hydrological Alterations and e-flows components. The annual distribution method and the 30%Q-D (30% of daily discharge) methods showed a low alteration at the five global indexes for each group of Indicators of Hydrological Alterations and e-flows components, which allowed us to conclude that these methods are superior to the other methods. Hence, the study results concluded that 30%Q-D and annual distribution methods are more suitable for the e-flows implementation to meet the riverine ecosystem’s annual dynamic demand to maintain the river’s health. This case study can be used as a guideline to allocate e-flows in the Kaligandaki River, particularly for small hydropower plants.

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Section: Discussionmentioning

confidence: 99%

Environmental Flows Assessment in Nepal: The Case of Kaligandaki River

et al. 2020

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“…Flow duration curves (FDC; Sugiyama et al 2003) were applied for different study periods for both stations. A FDC summarises changes occurring in the flow at a certain location of a catchment (Best et al 2003;Verma et al 2016).…”

Section: Assessment Of the Combined Effect Of Anthropogenic Pressuresmentioning

confidence: 99%

Assessment of Upstream Human Intervention Coupled with Climate Change Impact for a Transboundary River Flow Regime: Nile River Basin

Ahmed

Al-Faraj

Scholz

et al. 2019

Water Resour Manage

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The aim of this article is to determine how human interventions in upstream countries coupled with drought events are affecting the flow regime of downstream countries using the Nile River basin for illustrative purposes. This has been addressed by assessing climate change in the study area through analyses of precipitation data obtained from the Global Precipitation Climatology Centre (GPCC) and detecting if there is a trend, and subsequently calculating drought events in the main basins impacting on the downstream flow. Then river discharge data were analysed using different hydraulic indices at key stations in the downstream country and measuring the alterations occurring in the flow. The degree of alteration is a function of the number of civil engineering projects being in operation and classified by time windows; pre-alteration is between 1900 and 1925, while the alteration period is between 1933 and 2012. The alteration period was classified into three periods based on the degree of alteration. The findings revealed that there are changes in the river flow regime caused by both changes in the rainfall pattern in addition to the regulation in the upstream countries. There is a direct relationship between the interventions in the upstream countries and changes in the flow regime especially when coupled with drought events. By increasing the water usage upstream, there is an increase in the alteration of the flow downstream. The years between 2000 and 2012 were linked to the highest alterations between the modified years.

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“…The hydrological method calculates ecological flow by analyzing the frequency distribution characteristics of historical runoff series. Some representative hydrological methods, such as the Tennant method [8], NGPRP (Northern Great Plains Resource Program) method [9], minimum monthly mean flow method [10], month-by-month minimum ecological flow method [11], flow duration curve method [12], and the 7Q10 (seven-day low flow with a 10-year recurrence interval) method [13]. For example, Tennant defined 10% to 30% of the annual mean flow as the ecological flow range by analyzing the respective relationship between flow and river width, and velocity and depth [14].…”

Section: Introductionmentioning

confidence: 99%

“…Each ecological flow calculation method has its own foundational principle and obtains different result for the same river. It is difficult to judge which method is more suitable to the natural situation, due to the real value of ecological flow not being observed in practice [8][9][10][11][12][13]. Furthermore, some methods focus on the maintenance of riverine ecosystem health, while some methods focus on the utilization of water resources.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Comprehensive Ecological Flow with Weighted Multiple Methods Considering Hydrological Alteration

Xing

Wang

Gong

et al. 2018

Water

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Instream ecological flow is an essential determinant of river health. Intra- and interannual distribution characteristics of runoff have been altered to different degrees by dam construction. Historical runoff series with alterations, as basic data for ecological flow calculation, provide minimal instream hydrological process information, which affects the credibility of calculation results. Considering the influence of the alterations in runoff series on ecological flow calculation, the Gini coefficient (GI) is introduced to study the evenness degrees of the intra-annual runoff distribution of four hydrological stations located in the Naolihe basin of the Sanjiang Plain. The hydrological alteration diagnosis system is used to examine the alteration points in the GI series of each hydrological station for selecting reasonable subsequences. Based on the selected subsequences, the ecological flow of each station is calculated using three hydrological methods, and the comprehensive ecological flow is calculated using weighted calculation results from the three hydrological methods. The study results show that ecological flow and natural flow have similar processes with two peaks occurring in the process in May and August, respectively. Also, dams decrease the ecological water requirement damage frequency in dry seasons, but overuse of water resources increases the ecological water requirement damage frequency in flood seasons.

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Design flow duration curves for environmental flows estimation in Damodar River Basin, India

Cited by 37 publications

References 20 publications

Environmental Flows Assessment in Nepal: The Case of Kaligandaki River

Environmental Flows Assessment in Nepal: The Case of Kaligandaki River

Assessment of Upstream Human Intervention Coupled with Climate Change Impact for a Transboundary River Flow Regime: Nile River Basin

Calculation of Comprehensive Ecological Flow with Weighted Multiple Methods Considering Hydrological Alteration

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