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California is facing a critical water supply shift as climate change depletes traditional snowmelt-fed reservoirs, leading to an increased reliance on groundwater. The document highlights that snow is melting up to 30 days earlier than in the mid-twentieth century and that the state's surface-water storage is not designed for a future of rain-dominant precipitation. This has led to the over-pumping of aquifers, particularly in the Central Valley. To address this, the document advocates for the implementation of the Sustainable Groundwater Management Act (SGMA) of 2014, which requires local agencies to develop sustainability plans by 2020. The authors propose capturing floodwaters to recharge aquifers, which would simultaneously reduce flooding risks and provide a buffer against future droughts.

Margaret Bowman of the Walton Family Foundation outlines a vision for water resilience in the Colorado River basin to address a projected gap of 3.2 million acre feet between water supply and demand by 2060. The proposed strategy relies on three primary pillars: upgrading agricultural irrigation to save an estimated one million acre feet, implementing urban water efficiency programs to save another one million acre feet, and utilizing wastewater and stormwater recycling to gain 1.2 million acre feet. Bowman advocates for market-based water banking and targeted augmentation over large-scale water import schemes. She emphasizes the interdependence of urban and agricultural sectors and highlights the 2012 international agreement between the United States and Mexico as a model for cooperation, citing a recent pulse flow experiment in the Colorado River delta as an example of ecological and social co-benefits.

The report assesses South Africa's water-stressed environment, highlighting the dominance of agricultural water demand and critical challenges such as non-revenue water losses and a severe shortage of technical skills. It details the governance roles of the Department of Water Affairs and various grants available for municipal infrastructure. In the Western Cape, the report identifies specific projects like the Berg River Improvement Plan and various wastewater treatment plant upgrades as key areas of activity and private sector opportunity.

The report outlines a framework for an Agricultural Water Security Market (AWSM) in southwestern Manitoba, designed to mitigate the impact of the expanding oil and gas sector on regional water security. The proposed market would enable companies to achieve 'water neutrality' by purchasing offsets that fund the creation of water retention sites, which in turn support groundwater recharge and provide co-benefits like flood mitigation and nutrient retention. The document analyzes 11 national and international water trading models to inform the AWSM's design, which is intended to start as a voluntary system based on corporate social responsibility before potentially transitioning to a regulated market. It estimates a potential water storage supply of 6,287 cubic decametres against an annual oil and gas demand of 400 to 600 cubic decametres. The report identifies key potential actors, including the Oil Producing Municipalities of Manitoba and Manitoba Conservation and Water Stewardship, and examines the provincial and federal legislative frameworks that could support the market's operation.

The report proposes an Agricultural Water Security Market (AWSM) for southwestern Manitoba to mitigate potential water shortages caused by climate change and industrial demand. Under this model, the oil and gas sector would purchase water quantity offsets by funding the creation of water retention sites, which enhance regional water security through groundwater recharge and increased surface water access.

The report uses the Soil Water Assessment Tool (SWAT) and a lumped groundwater model to evaluate the Jaldhaka watershed's current hydrology and the effects of shifting land use or increasing groundwater pumping. It finds that while both a deforestation scenario and an electrification scenario increase rice production, deforestation significantly raises flood risks. Electrification increases productivity but may lead to groundwater depletion of up to 8 meters in downstream areas under a 100% adoption scenario, though this may be partially offset by induced recharge from perennial rivers.

The review finds that AWM interventions generally produce positive impacts across five capitals—financial, natural, social, physical, and human—with projects employing multiple interventions yielding more positive results. However, it highlights a critical lack of systematic monitoring and evaluation, particularly regarding negative externalities and long-term sustainability.

The report analyzes the economic trade-offs between decentralized and centralized wastewater systems, arguing that while treatment plants exhibit economies of scale, collection networks often exhibit diseconomies of scale. It highlights the financial advantages of modular, 'just-in-time' capacity expansion and the potential for water reuse and nutrient harvesting. The document also details various economic valuation methods for non-market environmental goods and the importance of professional management to ensure system reliability.

The document provides a detailed framework for 'restorative redevelopment' in the Nine Mile Run Watershed, focusing on shifting from conventional 'end of the pipe' stormwater conveyance to site-based infiltration and treatment. It details conceptual designs for four representative sites—Hunter Park, Edgewood Crossroads, Regent Square Gateway, and Sterrett School—and proposes a comprehensive policy framework to overcome institutional barriers to green infrastructure.

The report presents a model for urban watershed restoration in the Pittsburgh region, specifically focusing on the 6.5 square mile Nine Mile Run watershed. It argues for 'restorative redevelopment,' which embeds the removal of stormwater from sewer systems into the incremental process of urban renewal. By using 'green infrastructure'—such as bioretention areas, porous pavements, and cisterns—the model aims to reduce combined sewer overflows (CSOs) and sanitary sewer overflows (SSOs) while providing community benefits like beautification and recreational amenities. The report details four sample designs (Hunter Park, Edgewood Crossroads, Sterrett School, and Regent Square Gateway) that meet specific hydrologic and budget criteria, and recommends the establishment of a permanent coordinating body to manage the watershed across municipal boundaries.

The document critiques traditional 'water productivity' measures for focusing too heavily on agricultural output ('crop per drop') while ignoring the essential water needs of broader landscape ecosystem services. It advocates for an integrated water resource management (IWRM) approach that mimics natural water storage and incorporates 'bottom-up' input from diverse stakeholders to balance agricultural gains with the preservation of aquatic and terrestrial ecosystems. Using case studies from India and Zambia, the brief demonstrates how narrow productivity gains can create downstream trade-offs or overlook the primary subsistence drivers of rural livelihoods.

The report examines the relationship between water productivity, water flows, and ecosystem services, emphasizing that narrow agricultural efficiency often creates trade-offs with broader landscape health. It advocates for an integrated approach to water resource management that values regulating and supporting services alongside provisioning ones.

The study analyzes the impact of urbanization on natural infrastructure in 10 major Indian cities from 2000 to 2015, finding significant increases in built-up areas and a corresponding loss of surface water and groundwater recharge potential. It advocates for an integrated urban blue-green approach to planning to mitigate risks like urban flooding and water scarcity.

Free-flowing rivers, defined as those largely unaffected by human-made changes to flow and connectivity, are critical for biodiversity, groundwater recharge, and human survival. Only one-third of the world's 246 longest rivers (those 1,000 km or longer) remain free-flowing, with most remaining in remote, less developed, or politically complex regions. Infrastructure, particularly dams, roads, and buildings, disrupts sediment transfer and animal migration, threatening deltas and fish stocks. WWF aims to protect these systems by opposing harmful dams, promoting protective laws, supporting sustainable energy alternatives to hydropower, and pursuing dam removal.

Groundwater constitutes nearly all of the world's liquid freshwater and is essential for drinking water, agriculture, and maintaining river flows. In the Rio Grande/Rio Bravo basin, groundwater is critically overdrawn and endangered by climate change and population growth, leading to initiatives like WWF-Mexico's nature-based aquifer recharge projects.

The 'Recharge Pakistan' project, funded by the Green Climate Fund (GCF) with approximately $76 million, focuses on reducing flood and drought risk in the Indus Basin. The project implements Ecosystem-based Adaptation (EbA) and green infrastructure across four primary sites: Manchar Lake (Sindh), Chakar Lehri (Balochistan), and the D.I. Khan and Ramak watersheds (Khyber Pakhtunkhwa). The document outlines a comprehensive safeguarding approach to mitigate risks related to natural habitats, indigenous peoples, community health, and security. Key mechanisms include the Free, Prior and Informed Consent (FPIC) process for indigenous groups, a Livelihood Restoration Plan (LRP) for economically displaced persons, and a multi-tiered Grievance Redress Mechanism (GRM). Due to the precarious security situation in Khyber Pakhtunkhwa and Balochistan, the project incorporates a specific Security Plan and continuous engagement with tribal elders through the jirgah system.