Artificial groundwater recharge involves using surface water in basins, furrows, ditches, or other facilities to infiltrate into the soil and recharge aquifers. It is increasingly used for short- or long-term underground storage, offering advantages over surface storage and water reuse. Artificial recharge requires permeable surface soils; if unavailable, trenches or shafts in the unsaturated zone or direct aquifer injection through wells can be used. Designing such systems requires determining soil infiltration rates and checking the unsaturated zone for adequate permeability and absence of polluted areas. The aquifer must be sufficiently transmissive to avoid excessive groundwater mounds. Field investigations and test basins are used to predict system performance. Water quality issues, such as clogging layers on basin bottoms or geochemical reactions in the aquifer, must be evaluated. Clogging layers are managed through desilting, pretreatment of water, and remedial techniques like drying, scraping, or disking. Recharge wells should be periodically pumped to backwash clogging layers. Artificial recharge systems include surface infiltration (in-channel and off-channel) and vadose-zone infiltration (trenches, wells). Surface infiltration systems require permeable soils to achieve high infiltration rates. If permeable soils are not available, trenches or wells in the unsaturated zone can be used. Vadose-zone wells are typically 1 m in diameter and up to 60 m deep, backfilled with sand or gravel. Water is applied through a perforated pipe, and free-falling water is avoided to prevent air entrainment. Recharge trenches are dug with a backhoe, backfilled with sand or gravel, and covered to blend with the surroundings. Water sources for recharge include streams, storm runoff, aqueducts, irrigation districts, and treated wastewater. Recharge wells are used when permeable soils or surface infiltration systems are not available. They require careful design to avoid clogging, which can be managed through pretreatment of water and periodic pumping. Clogging is caused by physical, biological, and chemical processes, including accumulation of suspended solids, microbial growth, and chemical precipitation. Clogging layers reduce infiltration rates and become the main bottleneck in the infiltration process. These layers can range from a few mm to several centimeters in thickness. Infiltration rates vary with water viscosity and temperature, so recharge systems should be designed based on winter conditions when infiltration rates are lowest. Combination systems use surface infiltration and vertical infiltration to manage clogging and improve recharge efficiency. These systems are particularly useful when deeper fine-textured layers restrict downward movement of water. Pilot testing is essential to evaluate system performance and manage clogging effectively. Design and management of recharge systems require careful consideration of soil properties, hydrogeology, and water quality to ensure long-term success.Artificial groundwater recharge involves using surface water in basins, furrows, ditches, or other facilities to infiltrate into the soil and recharge aquifers. It is increasingly used for short- or long-term underground storage, offering advantages over surface storage and water reuse. Artificial recharge requires permeable surface soils; if unavailable, trenches or shafts in the unsaturated zone or direct aquifer injection through wells can be used. Designing such systems requires determining soil infiltration rates and checking the unsaturated zone for adequate permeability and absence of polluted areas. The aquifer must be sufficiently transmissive to avoid excessive groundwater mounds. Field investigations and test basins are used to predict system performance. Water quality issues, such as clogging layers on basin bottoms or geochemical reactions in the aquifer, must be evaluated. Clogging layers are managed through desilting, pretreatment of water, and remedial techniques like drying, scraping, or disking. Recharge wells should be periodically pumped to backwash clogging layers. Artificial recharge systems include surface infiltration (in-channel and off-channel) and vadose-zone infiltration (trenches, wells). Surface infiltration systems require permeable soils to achieve high infiltration rates. If permeable soils are not available, trenches or wells in the unsaturated zone can be used. Vadose-zone wells are typically 1 m in diameter and up to 60 m deep, backfilled with sand or gravel. Water is applied through a perforated pipe, and free-falling water is avoided to prevent air entrainment. Recharge trenches are dug with a backhoe, backfilled with sand or gravel, and covered to blend with the surroundings. Water sources for recharge include streams, storm runoff, aqueducts, irrigation districts, and treated wastewater. Recharge wells are used when permeable soils or surface infiltration systems are not available. They require careful design to avoid clogging, which can be managed through pretreatment of water and periodic pumping. Clogging is caused by physical, biological, and chemical processes, including accumulation of suspended solids, microbial growth, and chemical precipitation. Clogging layers reduce infiltration rates and become the main bottleneck in the infiltration process. These layers can range from a few mm to several centimeters in thickness. Infiltration rates vary with water viscosity and temperature, so recharge systems should be designed based on winter conditions when infiltration rates are lowest. Combination systems use surface infiltration and vertical infiltration to manage clogging and improve recharge efficiency. These systems are particularly useful when deeper fine-textured layers restrict downward movement of water. Pilot testing is essential to evaluate system performance and manage clogging effectively. Design and management of recharge systems require careful consideration of soil properties, hydrogeology, and water quality to ensure long-term success.