Estimation of Environmental Water Requirement and Ecological Water Level of Parishan Wetland with the Purpose of Transferring Water from Nargesi Dam and Restoration of the Wetland

Document Type : Research Paper

Authors

1 Department of Fisheries, Natural Resources Faculty, University of Tehran, Karaj, Iran.

2 Assistant Professor, Department of Agriculture and Natural Resources, Faculty of Engineering, Payame Noor University, Tehran, Iran.

3 Iran Water Resources Management Company, Ministry of Energy, Tehran, Iran.

Abstract

The purpose of this research was to calculate the environmental water requirement and ecological water level of Parishan wetland to transfer water from Nargesi Dam. Based on hydrological information, there is no relationship between the volume of water in the wetland, the amount of rainfall and runoff input. Therefore, the main factor of wetland death is the improper use of water in agriculture in addition to drought. To determine the hydrological water right, the balance formula of lakes was used. Accordingly, the environmental water requirement is 15.05 million cubic meters per year in the case of stop-cultivation plan, and 35.95 in case of limiting 50% of agricultural wells. If the first scenario is implemented, without drought and water transfer after 3.5 years, the groundwater will reach to zero level and then the restoration process will begin, but with the implementation of the second scenario, this time is 5 years and in case of water transfer from the dam, it will be accelerated. Flagship species include Dalmatian pelican, Golden barb and common reed. The year of 2007 was the last year that the entire area had water. Multi Species Indicators (MSI) was 80 and desirable. In 2007, the amount of fishing was 64 tons and it was desirable. The area of ​​reeds in the same year was 220 hectares. Therefore, the minimum ecological level, based on the volume of wetlands in 2007, is 39.3 million cubic meters, but the ecological balance level based on the average volume of wetlands in watery years is 51.6 million cubic meters. Thus, using hydrological and ecological indicators determine the minimum and optimal volume for the restoration of the wetland to its natural functions, and the role of accurate statistics of indicator organisms is very important.

Keywords

References

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Iranian Journal of Soil and Water Research
Volume 53, Issue 3
June 2022
Pages 435-446

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