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Sixty years of global progress in managed aquifer recharge
The last 60 years has seen unprecedented groundwater extraction and overdraft as well as development of new technologies for water treatment that together drive the advance in intentional groundwater replenishment known as managed aquifer recharge (MAR). This paper is the first known attempt to quantify the volume of MAR at global scale, and to illustrate the advancement of all the major types of MAR and relate these to research and regulatory advancements. Faced with changing climate and rising intensity of climate extremes, MAR is an increasingly important water management strategy, alongside demand management, to maintain, enhance and secure stressed groundwater systems and to protect and improve water quality. During this time, scientific research—on hydraulic design of facilities, tracer studies, managing clogging, recovery efficiency and water quality changes in aquifers—has underpinned practical improvements in MAR and has had broader benefits in hydrogeology. Recharge wells have greatly accelerated recharge, particularly in urban areas and for mine water management. In recent years, research into governance, operating practices, reliability, economics, risk assessment and public acceptance of MAR has been undertaken. Since the 1960s, implementation of MAR has accelerated at a rate of 5%/year, but is not keeping pace with increasing groundwater extraction. Currently, MAR has reached an estimated 10 km3/year, ~2.4% of groundwater extraction in countries reporting MAR (or ~1.0% of global groundwater extraction). MAR is likely to exceed 10% of global extraction, based on experience where MAR is more advanced, to sustain quantity, reliability and quality of water supplies.
Journal Article
Managed aquifer recharge in MENA countries : developments, applications, challenges, strategies, and sustainability
This text presents an updated state-of-the-art for managed aquifer recharge (MAR) for MENA regions. MENA regions are home to 6% of the world's population but only possess 1.4% of its water resources with almost absolute scarcity. Groundwater is the primary source of water in 54% of MENA countries. Therefore, the MENA regions seek sustainable management solutions amid its arid climate and rising demands from urbanization and agriculture. MAR aims to help sustain groundwater resources. This book explores MAR as a strategic approach to reducing water security by enhancing groundwater supplies. Utilizing techniques such as soil aquifer recharge, aquifer storage and recovery, rainfall harvesting, and riverbank filtration. The presented case studies offer deep insights into MAR methods, their implementation, and MAR technologies.
BOOK
Estimating Groundwater Recharge
Understanding groundwater recharge is essential for successful management of water resources and modeling fluid and contaminant transport within the subsurface. This book provides a critical evaluation of the theory and assumptions that underlie methods for estimating rates of groundwater recharge. Detailed explanations of the methods are provided - allowing readers to apply many of the techniques themselves without needing to consult additional references. Numerous practical examples highlight benefits and limitations of each method. Approximately 900 references allow advanced practitioners to pursue additional information on any method. For the first time, theoretical and practical considerations for selecting and applying methods for estimating groundwater recharge are covered in a single volume with uniform presentation. Hydrogeologists, water-resource specialists, civil and agricultural engineers, earth and environmental scientists and agronomists will benefit from this informative and practical book. It can serve as the primary text for a graduate-level course on groundwater recharge or as an adjunct text for courses on groundwater hydrology or hydrogeology. For the benefit of students and instructors, problem sets of varying difficulty are available at http://wwwbrr.cr.usgs.gov/projects/GW_Unsat/Recharge_Book/
eBook
Estimating groundwater recharge
Provides a critical evaluation of the theory and assumptions that underlie methods for estimating rates of groundwater recharge.
Book
Isogeochemical Characterization of Mountain System Recharge Processes in the Sierra Nevada, California
Mountain System Recharge processes are significant natural recharge pathways in many arid and semi‐arid mountainous regions. However, Mountain System Recharge processes are often poorly understood and characterized in hydrologic models. Mountains are the primary water supply source to valley aquifers via lateral groundwater flow from the mountain block (Mountain Block Recharge) and focused recharge from mountain streams contributing to focused Mountain Front Recharge at the piedmont zone. Here, we present a multi‐tool isogeochemical approach to characterize mountain flow paths and Mountain System Recharge in the northern Tulare Basin, California. We used groundwater chemistry data to delineate hydrochemical facies and explain the chemical evolution of groundwater from the Sierra Nevada to the Central Valley aquifer. Stable isotopes and radiogenic groundwater tracers validated Mountain System Recharge processes by differentiating focused from diffuse recharge, and estimating apparent groundwater age, respectively. Novel application of End‐Member Mixing Analysis using conservative chemical components revealed three Mountain System Recharge end‐members: (a) evaporated Ca‐HCO3 water type associated with focused Mountain Front Recharge, (b) non‐evaporated Ca‐HCO3 and Na‐HCO3 water types with short residence times associated with shallow Mountain Block Recharge, and (c) Na‐HCO3 groundwater type with long residence time associated with deep Mountain Block Recharge. We quantified the contribution of each Mountain System Recharge process to the valley aquifer by calculating mixing ratios. Our results show that deep Mountain Block Recharge is a significant recharge component, representing 31%–53% of the valley groundwater. Greater hydraulic connectivity between the Sierra Nevada and Central Valley has significant implications for parameterizing groundwater flow models. Our framework is useful for understanding Mountain System Recharge processes in other snow‐dominated mountain watersheds. Key Points A multi‐tool isogeochemical approach differentiates among mountain recharge pathways Incorporating chemical reactions in the End‐Member Mixing Analysis strongly improves mixing ratio calculation Mountain block recharge originating from the Sierra Nevada accounts for 31%–53% of recharge in the southern Central Valley
Journal Article
Groundwater depletion and sustainability of irrigation in the US High Plains and Central Valley
Aquifer overexploitation could significantly impact crop production in the United States because 60% of irrigation relies on groundwater. Groundwater depletion in the irrigated High Plains and California Central Valley accounts for ∼50% of groundwater depletion in the United States since 1900. A newly developed High Plains recharge map shows that high recharge in the northern High Plains results in sustainable pumpage, whereas lower recharge in the central and southern High Plains has resulted in focused depletion of 330 km3 of fossil groundwater, mostly recharged during the past 13,000 y. Depletion is highly localized with about a third of depletion occurring in 4% of the High Plains land area. Extrapolation of the current depletion rate suggests that 35% of the southern High Plains will be unable to support irrigation within the next 30 y. Reducing irrigation withdrawals could extend the lifespan of the aquifer but would not result in sustainable management of this fossil groundwater. The Central Valley is a more dynamic, engineered system, with north/south diversions of surface water since the 1950s contributing to ∼7× higher recharge. However, these diversions are regulated because of impacts on endangered species. A newly developed Central Valley Hydrologic Model shows that groundwater depletion since the 1960s, totaling 80 km3, occurs mostly in the south (Tulare Basin) and primarily during droughts. Increasing water storage through artificial recharge of excess surface water in aquifers by up to 3 km3 shows promise for coping with droughts and improving sustainability of groundwater resources in the Central Valley.
Journal Article
Delineation of groundwater potential zones and recommendation of artificial recharge structures for augmentation of groundwater resources in Vattamalaikarai Basin, South India
Nowadays, GIS and remote sensing techniques are effectively used to find groundwater prospect zones in various troublesome landscapes throughout the world. In the present work, groundwater potential zonation mapping was carried out for the Vattamalaikarai River basin in South India by overlaying ten thematic maps such as soil, drainage density, lineament density, geology, slope, land use/land cover, geomorphology, topographic position index, rainfall and groundwater level by giving appropriate weightages to each significant parameter with respect to its influence on groundwater. As the basin mainly depends on the groundwater resources, it is necessary to assess the groundwater prospect for the better management of aquifer system. Groundwater potential zonation map illustrates that more than 50% of the basin region falls under moderate to low groundwater potential category. Highly influential thematic layers were integrated to generate groundwater recharge zonation map. Based on this output, artificial recharge sites were selected to replenish the groundwater resources in the basin. Three check dam sites were suggested across the third- and fourth-order streams. Four suitable sites for the construction of percolation ponds and ten locations for the construction of recharge pits were also identified. Four injection well sites were recommended to augment groundwater in the aquifer present under the black cotton soil regions in the western part of the basin.
Journal Article
Delineation of optimal locations for artificial groundwater recharge utilizing MIF and GIS in a semi-arid area
Increased demand for groundwater resources and decreased accessibility require long-term groundwater conservation, particularly in metropolitan settings. The current contribution aims to identify potential groundwater recharge zones in Afghanistan’s Kabul basin through water conservation measures. The study includes the watershed of Kabul City, which directly impacts groundwater from hydrological and hydrogeological points of view. Therefore, considering these conditions, the present study has proposed specific methods for recharging groundwater. A comprehensive approach has been employed, including multi-influencing factors, remote sensing data, and geographic information systems. Geology, geomorphology, lineament density, drainage density, rainfall, soil type, land use and land cover, and slope are geo-environmental factors. The findings show that geology, geomorphology, lineament density, and slope are the major determinants of groundwater recharge in the studied region. According to the appropriateness for groundwater recharge, the projected recharge potential zones of the basin are divided into four groups: very good (8.45% of the area), good (36.4%), moderate (35.4%), and least (19.7%). The very good and good recharge zones cover about half of the basin, making it perfect for various groundwater-recharging techniques. Based on the diversity of geo-environmental factors of the study area, various methods of artificial groundwater recharge have been recommended for different regions. These methods include check dams, contour trenches, recharge wells, and rooftop rainwater harvesting with the addition of recharge wells. The study’s findings will help sustainably develop the area’s groundwater management strategies.
Journal Article
Rapid groundwater decline and some cases of recovery in aquifers globally
Groundwater resources are vital to ecosystems and livelihoods. Excessive groundwater withdrawals can cause groundwater levels to decline
1
–
10
, resulting in seawater intrusion
11
, land subsidence
12
,
13
, streamflow depletion
14
–
16
and wells running dry
17
. However, the global pace and prevalence of local groundwater declines are poorly constrained, because in situ groundwater levels have not been synthesized at the global scale. Here we analyse in situ groundwater-level trends for 170,000 monitoring wells and 1,693 aquifer systems in countries that encompass approximately 75% of global groundwater withdrawals
18
. We show that rapid groundwater-level declines (>0.5 m year
−1
) are widespread in the twenty-first century, especially in dry regions with extensive croplands. Critically, we also show that groundwater-level declines have accelerated over the past four decades in 30% of the world’s regional aquifers. This widespread acceleration in groundwater-level deepening highlights an urgent need for more effective measures to address groundwater depletion. Our analysis also reveals specific cases in which depletion trends have reversed following policy changes, managed aquifer recharge and surface-water diversions, demonstrating the potential for depleted aquifer systems to recover.
Analysis of about 170,000 monitoring wells and 1,693 aquifer systems worldwide shows that extensive and often accelerating groundwater declines are widespread in the twenty-first century, but that groundwater levels are recovering in some cases.
Journal Article