Abstract
Groundwater in Iraq is considered to be an alternative water resource, especially for areas far away from surface water. Groundwater is affected by many factors including climate change, industrial activities, urbanization, and industrialization. In this study, the effect of artificial recharge on the quantity of groundwater in the Dibdibba unconfined aquifer in Iraq was simulated using a groundwater modeling system (GMS). The main raw water source used in the artificial recharge process was the reclaimed water output (tertiary treatment) from the main wastewater treatment plant (WWTP) in Kerbala, with 20 injection wells. After calibration and validation of the three-dimensional numerical model used in this study and taking wastewater recharge rates into account, two different scenarios were applied to obtain the expected behavior of the aquifer when the groundwater levels were augmented with 5% and 10% of the daily outflow production of the WWTP in Kerbala. The model matched the observed head elevations with R2 = 0.951 for steady state and R2= 0.894 for transient simulations. The results indicate that the injection of treated water through 20 wells raised the water table in more than 91 and 136 km2 for 5000 and 10,000 m3/day pumping rates, respectively. Moreover, increasing the volume of water added to the aquifer could lead to establishing new agricultural areas, spanning more than 62 km2, extending about 20 km along the river.
Highlights
Water and groundwater play a pivotal role in food security and economic evolution all over the world
Groundwater is used as an alternative source of water when there is a shortage of surface water
The present study focuses on the range area near the Kerbala wastewater treatment plant (WWTP)
Summary
Water and groundwater play a pivotal role in food security and economic evolution all over the world. In recent decades, the ever-increasing demand for water due to urbanization, economic development, population growth, and climate change has caused water scarcity and restricted economic evolution in many countries. Groundwater is the major source of irrigation water in countries with arid and semiarid climates. Efficient management of groundwater resources is necessary to meet the growing water demand. Climate change and global warming can influence groundwater resources in many ways, either directly or indirectly. Increasing temperatures and changing patterns of precipitation will directly impact groundwater recharge, discharge, water levels, and annual storage. The rising level of the sea, increased demand for irrigation water, and changes in vegetation cover can indirectly affect the quality of groundwater resources. Global warming will lead to changes in plant transpiration and evaporation rates, which denote soil dryness, causing higher soil moisture losses and reducing natural groundwater recharge [3]
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