Evaluation Of Artificial Recharge And Flood Spreading Scenarios For Integrated Surface And Groundwater Resources Management Using WEAP Model Case Study (Varamin Plain)

Due to the relative constraints of water resources and excessive over-discharge of groundwater resources in the plains of the country, integrated water resources management is essential. Present study carried out to assess artificial recharge and flood spreading scenarios for integrated water resources management using WEAP model in Varamin plain.The required data, including the discharge of stream flow gauge of Shoor and Jajrood rivers, the volume of the Latian and Mamlu dams, rainfall, evaporation, population, population growth rate, water demand of drinking, agricultural and industrial sectors of the area in the base year of model (2016-2017) were gathered and entered in the software. Then, the artificial recharge scenario was developed and compared with the reference scenario in a 20-year period. The results showed that if the current status of water resources management continues, in the next 20 years, we will not be able to cover 16.2 and 27.4 percent of the water demand of agricultural and industrial sectors in Varamin plain, respectively. Whereas, if 33 million cubic meters of surface water streems of the region are injected to the aquifer by flood spreading method, annually, not only, 9.2 and 17.9 percent decrease in unmet water demand of agricultural and industrial sectors in comparison with the reference scenario, respectively, but also, based on current harvest volumes; the average of the aquifer storage increase from 351 to 388 million cubic meters, which will decrease the loss of groundwater resources of the region 1.21 centimeters by the average 20-year period.