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The Effects of Tressing in Reduction of Erosion and Prevention from Flooding in Chamani Region of Golestan Province

Authors:
[ naser ebadati ] -
[ reza maghsodlo rad ] -
[ kambiz alipour ] -

Abstract:

The damages resulting from floods is in a close relation with the population density, the amount of investment in infrastructural affairs and the level of agricultural and industrial development of mountainous areas. Consequently, preventing from erosion of soil and controlling the alluvial deposits using establishment of structures along the rivers and foothills can be taken as preventive measures. Considering that the lands of the region under the study have slopes of less than %30, tressing has been carried out for reducing the amount of flowing water, erosion of soil and volume of floodwater. The Chamani aquifer has been located in Minoodasht region, east of Golestan provinceand has some 3400 hectares area. It can be named as one of the aquifers of Chehel-chay of Minoodasht which is accessible through the asphalt road of Darook village. The aquifer is located at 55º, 28', 30" - 55º, 33', 16" Eastern longitude and 37º,1',34" -37º,5',39" Northern latitude. The height of the aquifer varies between 725 meters and 2800 meters. The average weight slope of the main waterway and the average slope of the aquifer are %13.6 and %25.7 respectively. The results of the studies indicate that the rate of erosion is 1257 m3 per year which has brought about unsuitable conditions in the region. The steep agricultural lands and unstable geological layers have accelerated the erosion. Alluvial floods along with deposits have caused intense erosion of the main waterways in some valleys. The plenty of sediments in the downstream areas and sand and mud during the time of low water flow prove the case.Considering the previous floods in the region during the past years, this project was selected to be implemented in the east of Golestan province. The project is comprised of tressing, take stemand fodder in the walls of tresses conforming the local culture of the region. Studies show that tressing has reduced the slopes, has controlled the floodwaters and has increased the precipitations. Furthermore, the time for accumulation of floodwaters has increased due to reduction of slopes; consequently, the maximum output of the floodwaters has decreased. Training of the local residents for getting acquainted with economic effects of the project for the people and the region has been one of the most important factors in successful implementation of the project.

Keywords:

Tressing, Flood, Chamain, Golestan Province.