Due to its extraordinarily high quality and availability, we take groundwater as an advantage and now experience groundwater management problems all over the world. Groundwater contributes approximately 20% of people's fresh water worldwide (Kinzelbach, Bauer, Siegfried, and Brunner). Groundwater is considered best suited for drinking, but we did not realize that over-pumping of groundwater could be vulnerable to degradation, leading to drying of wetlands, deterioration of water quality and increased of salinization. Since groundwater cannot be artificially renewed on a large scale, sustainable management of this resource is vital (Kinzelbach, et al.). Groundwater recharge would depend on precipitation because it is the primary source for groundwater creation and is something out of our control. We are seeing groundwater depletion due to over-pumping of an aquifer and this results in degradation of water quality, impacting natural wetlands and impacting drinking water due to contamination. To recharge groundwater, we would need to understand what would be affected, scientific tools to help manage groundwater sustainability, and different techniques we could use to artificially recharge groundwater. Groundwater depletion occurs when we over-pump an aquifer causing water quality to degrade. This can impact our drinking water systems, economic stability and groundwater levels. Groundwater originates from precipitation in our water cycle and is divided into two different types of groundwater flow; there are shallow groundwater flows and deep groundwater flows. Surface groundwater flow, also known as groundwater runoff, diverts over land surfaces and flows back into...... middle of paper... recycled water or treated domestic wastewater (Clapp, Corr, Dennehy , Mace, Paque, Parker, Tyrrell). Works Cited Appendix A - Assessment of Groundwater Conditions in the Borrego Valley, (2010). County of San Diego, Department of Land Use and Planning, GroundwaterStudy Master Plan Update.Clapp, L., Corr. E., Dennehy, K., Mace, R., Paque, M., Parker, M., Tyrrell, K. (2005). Questions about groundwater quality and desalination. National Groundwater Association.Kinzelbach, W., Bauer, P., Siegfried, T., Brunner, P., (2003). Sustainable groundwater management: scientific issues and tools. Institute of Hydromechanics and Water Resources Management.Ponce, VM, (2006). Groundwater use and sustainability. Groundwater use and sustainability, groundwater sustainability, sustainable groundwater yield, and sustainable groundwater development.