%0 Journal Article %T Application of Variable- Speed Pumps in Design and Operation of on- Demand Irrigation Systems %J Iranian Journal of Soil and Water Research %I University of Tehran %Z 2008-479X %A Delfan Azari, Morteza %A Parvaresh Rizi, Atefeh %D 2015 %\ 03/21/2015 %V 46 %N 1 %P 41-48 %! Application of Variable- Speed Pumps in Design and Operation of on- Demand Irrigation Systems %K Irrigation system %K Water loss %K Design of pumping station %K Pump performance %R 10.22059/ijswr.2015.54294 %X In most irrigation systems in our country, the pumping stations are equipped with fixedspeed pumps. These pumps in addition to causing water waste, demand extra energy.Providing a method for adjusting the pumps to function according to obligations ofoperation can improve efficiency of water distribution as well as energy efficiency. Oneof the choices toward this aim, is to employ the variable speed pumps which adjust withthe variable demand of system. In this study, by coding in MATLAB software, design ofpumping stations equipped with variable- speed pumps was done for a drip irrigationsystem. Then with regard to variable demand of discharge and pressure during irrigationseason, the designed system was evaluated and compared with some ordinary operationmethods based on constant speed pumps. The results show that the performance ofvariable- speed pumps to supply the pressure head and discharge is largely definitelyacceptable; while water losses in ordinary pumping stations, depending on the type ofstation, amount to from 16 to 36 percent. %U https://ijswr.ut.ac.ir/article_54294_0c1948a5fcf9a121ccb4f19380383391.pdf