INVESTIGATING AMOUNT OF LEAKAGE, SEDIMENT AND DURABILITY IN GEOSYNTHETIC COVER OF PUMPING CHANNEL 3 AT IRRIGATION NETWORK OF MOGHAN
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Geomembrane, Irrigation Canal, Leakage Control, Water Resources.Resumo
Controlling the losses of water leakage from channels and reservoirs is essential in order to protect the limited water resources of country. Yet, several methods have been used to control leakage and nowadays using the geosynthetic covers, such as geomembrane sheets, have been considered. The purpose of this research is to evaluate the leakage rate of channel with geosynthetic layer. In this research, at first the existing problems in different stages of designing and implementing the geomembrane covers in canals were studied. Then, the leakage rate of this type of covering was investigated in different conditions by using the input-output method. After investigating the sources, among the channels with geosynthetic covers in the Moghan irrigation network (it is in Iran), the Moghan pumping channel 3 was selected due to importance and technical features, and field and laboratory studies was done in terms of hydraulic properties, control of leakage, durability and reviewing the executive issues. Based on the results of experiments, the average of leakage discharge rate was reported 46.86 liters per day and per square meter. This leakage rate is moderate in compared with other studied geosynthetic covers in other places (14-69 liters per day and per square meter). However, it seems necessary to investigate leakage rate in different parts of network and to determine its time changings for proper maintenance and using the geosynthetic materials is recommended to prevent water loss from similar channels.Referências
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