Document Type : Research Paper
Authors
1 postdoc researcher
2 Assistant Professor, Soil Conservation and Watershed Management Research Department, Lorestan Agricultural and Natural Resources Research and Education Center, AREEO, Khorramabad, Iran.
Abstract
Watershed management measures are carried out to maintain or restore the ecosystem function of watersheds by reducing the effects of events such as floods, landslides, erosion, etc. downstream and increasing the productivity of existing resources and improving local livelihoods. These measures become effective when they identify and restore or strengthen areas of high ecological value that must be protected from destruction or conversion to other uses.
In this study, the effectiveness of some of the latest watershed management plans implemented in different watersheds in Iran (the effectiveness of watershed measures in Behshahr-Galoogah watershed, Maragheh watershed - Markazi province, Khaveh-Delijan watershed, Asiaborud watershed in Chalus city and Faryab-Golashgerd watershed- Kerman province) and the state of the water resources were discussed according to the latest available documents.
Each of these projects and the positive and negative results were considered. The results of the implementation of watershed measures in Behshahr-Galoogah watershed indicated that in the sub-basins where the measures were constructed as a combination of different structures compared to the streams regime, it was effective in reducing the peak discharge of runoff and increasing the concentration time. In sub-basins with few check dams, according to sub-basins area and the long length of the streams, these check dams did not cause a significant reduction in streams length, changing the concentration time and peak discharge of runoff, but stabilized streams longitudinal profile. Based on the findings of the effectiveness of watershed measures in Maragheh watershed-Markazi Province, specific erosion and specific sediment, before and after the implementation of watershed measures were evaluated 10.78 and 3.14 (Ton/km2), 3.1 and 66. 9 (Ton/km2) respectively. Also, the ratio of profit and cost evaluated 0.9, which is multiplied during the years of implementation so, it is higher than one, which indicates the economic efficiency of the project.
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