Quality can vary greatly across an aquifer, through its profile and over. Quantifying groundwater recharge from detention basins to. Estimation of recharge, by whatever method, are normally subject to large uncertainties and errors. An alternative recharge mechanism is proposed which allows recharge to occur even when a soil moisture deficit exists. Estimation of natural groundwater recharge springerlink. The watertable fluctuation method may be the most widely used technique for estimating recharge. Estimation of groundwater recharge to the gulf coast aquifer. Using groundwater levels to estimate recharge springerlink. However, it is hard to evaluate the accuracy of any method.
Nevertheless, only a handful of researchers, including meyboom 1961, rorabaugh 1964, and rutledge 1992, have focused on groundwater recharge through analyzing the stream. Estimating direct groundwater recharge using a simple water balance model sensitivity to land surface parameters j. Assuming that the groundwater contributing area is the same as the surfacewater drainage area, the longterm average base flow value, in inches, is a reasonable estimate for the recharge to the groundwater system. Estimating monetized benefits of groundwater recharge from stormwater retention practices pdf 74 pp, 3 mb, april 2016. Groundwater recharge also encompasses water moving. Estimation of groundwater recharge using weiping chen water.
The objective of this study was to quantify spatial variability in recharge in the outcrop zones of the gulf coast aquifer in texas. Accelerated groundwater recharge assessment project an affordable and practical water management tool what it is. Quantifying groundwater recharge is essential for managing water resources in aquifers. Estimation of groundwater recharge using water balance. Essay on groundwater recharge wastewater management. Groundwater characteristics quality and yield quality and yield are the primary measures used to make decisions about the potential use of groundwater although there are other factors that limit decisions such as the cost of drilling. Book climate drainage recharge base flow estimating groundwater recharge by richard w.
Groundwater recharge in wisconsinannual estimates for. Introduction the longterm management of groundwater resources requires careful estimation of the key components of the groundwater balance, including recharge and discharge. Groundwater recharge or deep drainage or deep percolation is a hydrologic process, where water moves downward from surface water to groundwater. Groundwater recharge an overview sciencedirect topics. If retrofitting or increased retention were to occur, the groundwater benefits would be even more significant.
We developed a threedimensional finitedifference groundwater flow model for the trinity aquifer in the hill country as a tool to 1 evaluate groundwater availability, 2 improve our conceptual understanding of groundwater flow in the region, and 3. This process usually occurs in the vadose zone below plant roots and, is often expressed as a flux to the water table surface. Groundwater flow systems the route which groundwater takes to a discharge point is known as a flow path. Recharge commonly is estimated at the watershed scale using simple waterbudget methods or numerical groundwater. Understanding groundwater recharge is a prerequisite for the meaningful simulation of groundwater flow and transport, and, hence, successful management of renewable water resources. Other articles where groundwater recharge is discussed. Choosing appropriate techniques for quantifying groundwater. A comparison of four methods to estimate groundwater. The patterns of groundwater flow from the recharge to the discharge areas form groundwater flow systems, which constitute the framework for understanding recharge processes.
The importance of groundwater d longwood university. Summary of groundwater recharge estimates for pennsylvania by stuart o. Using groundwater levels to estimate recharge request pdf. Conversely, in a discharge area there is a component to the direction of groundwater flow that is upward figure 1. A numerical groundwater flow model home texas water. He specializes in groundwater recharge and simulation of flow and transport in the unsaturated zone.
The estimation of groundwater recharge sciencedirect. The watertable fluctuation wtf method provides an estimate of groundwater recharge by analysis of waterlevel fluctuations in observation wells. Cook csiro land and water, private bag 2, glen osmond sa 5064, australia using groundwater levels to estimate recharge richard w. Many methods have been used for decades to estimate recharge. The primary purpose of most researches is to determine the groundwater component of stream. Healy has authored more than sixty scientific publications and is developer of the vs2di suite of models for simulating water, solute, and heat transport through variably saturated porous media. Regional recharge was estimated using the chloride mass. Recharge to the aquifer according to flows at 120 cm depth weinzettel and usunoff, 2001 soil water and groundwater balance model in order to obtain estimates of recharge to the aquifer that may be compared to the method above, the visual balan program samper et al.
Healy healy 2010, with contributions from bridget r. Healy and cook 2002, which make a better estimate of groundwater. Reductions in surface water can have adverse effects on the ecology of a watershed, stressing fish populations and their food supply, wetlands, and the plants and animals living along the banks of rivers and streams. Scanlon is an excellent addition to the growing knowledge base of groundwater science and technology. Guide on artificial recharge central ground water board. As a result, it is useful to apply multiple methods to estimate groundwater recharge healy and cook 2002.
Because recharge is a difficult parameter to quantify, it is. Finch institute of hydrology, wallingford, oxon, ox10 8bb, uk. In our project area, we have a pond managed by the community and the primary objective of this pond is to help ground water recharge. Groundwater recharge is an important variable in regionalscale hydrologic models and aquifersystem analysis 12. The method is based on the assumption that a rise in watertable elevation measured in shallow wells is caused by the addition of recharge across the water table. Ground water recharge includes recharge as a natural part of the hydrologic cycle and humaninduced recharge, either directly through spreading basins or injection wells, or as a consequence of human activities such as irrigation and waste disposal. However, no tools were available to quantify the volume of groundwater recharge expected from this practice. This page intentionally left blank estimating groundwater recharge understanding groundwater recharge is essential fo.
This book provides a critical evaluation of the theory and assumptions that underlie methods for estimating rates of groundwater recharge. Estimation of groundwater recharge using water balance model article pdf available in water resources 342. Since water moves from areas of high to low potential, lakes and rivers represent points of ground water recharge or discharge. Recharge is a major component of the groundwater system and has important implications for shallow groundwater quality.
Healy skip to main content accessibility help we use cookies to distinguish you from other users and to provide you with a better experience on our websites. Cambridge core geochemistry and environmental chemistry estimating groundwater recharge by richard w. The impactof changing rainfall intensitieson groundwater recharge in the tropics is unclear. Healy us geological survey, ms 4, box 25046, denver federal center, lakewood, colorado 80225, usa email. Estimation of groundwater recharge and discharge across. Estimating monetized benefits of groundwater recharge from. Chowdhury roberto anaya shaochih ted way texas water development board p.
The resulting annual recharge values based on the 123 streamflowgaging stations are shown in figure 2a. Curve number and groundwater recharge credits for lid facilities in new jersey kaveh zomorodi, ph. A comparison of four methods to estimate groundwater recharge. Groundwater recharge in wisconsinannual estimates for 1970.
Risser abstract groundwater recharge is water that infiltrates through the subsurface to the zone of saturation beneath the water table. You may need a pdf reader to view some of the files on this page. Estimating groundwater recharge pdf free download epdf. Box 231 austin, texas 7871231 1512 9360861, robert. Pdf estimation of groundwater recharge using water. Jan 12, 2002 accurate estimation of groundwater recharge is extremely important for proper management of groundwater systems. Recharge is a fundamental component of groundwater systems, and in groundwater modeling exercises recharge is either measured and specified or estimated during model calibration. For areas where this practice is possible, it is reasonable to allow a groundwater recharge credit for it as a compensatory volume towards the natural recharge volume lost due to development. Recharge and baseflow estimates were made using daily streamflow records. Summary of groundwaterrecharge estimates for pennsylvania. Estimation of natural ground water recharge civildigital.
Recharge can still be occurring even when a well hydrograph shows that water levels are declining. Groundwater is a far more important water resource than is. Recharge is the primary method through which water enters an aquifer. Accurate estimation of groundwater recharge is extremely important for proper management of groundwater systems. Estimation of groundwater recharge to the gulf coast. Whereas these methods provide an average recharge estimate for an area, recharge can vary. This is a pdf file of an unedited manuscript that has been accepted for.
Estimating direct groundwater recharge using a simple. Ground water recharge and discharge including ground watersurface water interactions ground watersurface water interaction is a term that has entered our vocabulary. You will be redirected to the full text document in the repository in a few seconds, if not click here. Abstract accurate estimation of groundwater recharge. Understanding groundwater recharge is essential for successful management of water resources and modeling fluid and contaminant transport within the subsurface. Chemistry estimating groundwater recharge by richard w. Pdf estimation of groundwater recharge using water balance. I need your expert suggestions for calculating groundwater recharge over a set period. Two interrelated facets should be evident in all such groundwater projects. Rick healy is a member of the unsaturated zone field studies project of the usgs national research program.
Summary of groundwaterrecharge estimates for pennsylvania by stuart o. Rates of groundwater recharge are greatest when rainfall inputs to the soil exceed evapotranspiration losses. Recharge and baseflow estimates will be used as input to a regional groundwater flow model, within the same study. Understanding groundwater recharge is a prerequisite for the. Recharge estimates were made at 16 streamflowgagingstation locations and were compared to recharge.
Estimating groundwater recharge understanding groundwater recharge is essential for the successful management of water resources and modeling. Groundwater recharge of surface water is particularly important during dry periods. Rainfall is the principal means for replenishment of moisture in the soil water system and recharge to ground water. How to estimate the amount of groundwater recharge through. Groundwater recharge is essential to groundwater resources availability to economy and society development in semiarid areas. Sustainable conservation and its partners are leading a project that puts into practice an affordable and practical water management tool onfarm groundwater recharge using floodwater that can be used to move.
Estimating direct groundwater recharge using a simple water. Estimating monetized benefits of groundwater recharge from stormwater retention practices prepared for united states environmental protection agency. His research addresses water, solute, and heat transport within the unsaturated zone. Such an occurrence simply indicates that the rate of recharge is less than the rate of water movement away from the water table healy and cook, 2002. When the water table is deep underground, the water of the aquifer may be exceedingly old, possibly a result of a past climatic regime. Estimating groundwater recharge and evapotranspiration from water. Healy, 9780521863964, available at book depository with free delivery worldwide. How to estimate the amount of groundwater recharge through a recharge pond. Many different approaches exist for estimating recharge. Spatiotemporal variation of groundwater recharge in response to variability in precipitation, land use and soil in yanqing basin, beijing, china. In addition for sustainable groundwater management, it is essential to balance abstraction with recharge changming et al. Many commercial businesses and industries in virginia also depend on groundwater for their processes and operations. With the purpose of assessing recharge, most cases of recharge studies were estimated by multiplying the magnitude of waterlevel. Nonpoint source control branch 4503t 1200 pennsylvania avenue, nw.
Case histories of artificial recharge in india 36 75 annexure 1 format for preparation of artificial recharge project. Groundwater recharge is the entry to the saturated zone of water made available at the water table surface. Estimates of groundwater recharge, base flow, and stream. Estimation of groundwater recharge using weiping chen. Substantial 70% declines in groundwater recharge, recently cited in ipcc ar4 6, have been projected in northeast brazil and southwest africa in association with higher air temperatures and lower rainfall 7. Estimating groundwater recharge, by richard w healy cambridge. Keywords groundwater recharge groundwater hydraulics groundwater flow general hydrogeology introduction recharge has been defined as the entry into the saturated zone of water made available at the watertable surface, together with the associated flow away from the water table within the saturated zone freeze and cherry 1979.
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