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Assessment of dam's downstream environmental needs by Montana method and its role in water resources management

Authors:

Abstract

The environmental demands value is one of the most important environmental problems in the country and must be taken into consideration in water resource management programs. Therefore it is very needful to determine a long-term option and find a suitable value for these demands. There are several methods to compute the required water for environmental purposes that Montana methodology is one of them. In this regards in this paper the water discharge of Sefidroud River analyzed during 40 years period. The environmental demands of Sefidroud River computed monthly according to Montana methodology. The result shows that the water discharge of Manjil Dam in some period is less than the recommended environmental demand values. Furthermore the results show that the discharge values during in some months are even less than the water required in critical class and if this trend continues the ecosystem of the Sefidroud River will damage irreparably in future. The negative impacts analyzed and at the end some suggestion presented to reduce the negative environmental impacts.
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Assessment of dam’s downstream environmental needs by Montana
method and its role in water resources management
A. Bagherzadeh, B. Pirooz, M. R. Kavianpour, S. Kardar, R. Saghari
Corresponding Author address: Senior Expert of Water Quality and Environment Office, Guilan Regional
Water Company, Iran
Corresponding Author E-mail: behrooz_pirooz@yahoo.com
Abstract
The environmental demands value is one of the most important environmental problems in the
country and must be taken into consideration in water resource management programs. Therefore it
is very needful to determine a long-term option and find a suitable value for these demands. There
are several methods to compute the required water for environmental purposes that Montana
methodology is one of them. In this regards in this paper the water discharge of Sefidroud River
analyzed during 40 years period. The environmental demands of Sefidroud River computed
monthly according to Montana methodology. The result shows that the water discharge of Manjil
Dam in some period is less than the recommended environmental demand values. Furthermore the
results show that the discharge values during in some months are even less than the water required
in critical class and if this trend continues the ecosystem of the Sefidroud River will damage
irreparably in future. The negative impacts analyzed and at the end some suggestion presented to
reduce the negative environmental impacts.
The 1st national conference on applied research in water resources, Kermanshah regional water,
2010, Iran.
... This is one of the commonest hydrological methods for calculating environmental demand and is used in more than 25 countries. Based on this criterion, if the flow is normal, the minimum environmental discharge required from March to August is 30% of the average annual discharge, while from September to February it is 10% of the annual average (Moridi et al. 2012;Bagherzadeh et al. 2011). Table 4 shows the monthly environmental discharge values (in Mm 3 ). ...
Article
Water storage using dams is a perfect solution for agricultural, industrial, drinking water supply, flood control, hydroelectric power generation, and other purposes. Integrated management of water resources involves the development, management, protection, regulation and beneficial use of surface-and ground-water resources. The reliability of water supply reservoirs depends on several factors, e.g. the physical characteristics of the reservoir, the time series of river discharge, climatic conditions, the amount of demand, and the method of operation. If a portion of a dam’s volume is kept empty for flood control, the confidence values of taking the bottom water demand will be reduced. In this paper, a yield-storage model developed in a MATLAB software environment is used to determine the optimal capacity of Darband dam in northeast Iran (the study phase). The reservoir’s performance with respect to demand downstream, e.g. from industry and agriculture, and for potable use, was studied, and the results compared for scenarios in flood control volume change conditions. The results show that, for a capacity of 80 Mm3, the reliability values for meeting agricultural, environmental, and potable water demand are estimated at 0.922, 0.927, and 0.942, respectively. If the reservoir’s capacity is changed from 80 to 350 Mm3, the reliability values increase by only about 7%.
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