scholarly journals Stampriet Transboundary Aquifer System Assessment -Technical Report. Governance of Groundwater Resources in Transboundary Aquifers (GGRETA) - Phase 1

2017 ◽  
Author(s):  
Chloé Meyer
Keyword(s):  
South Africa ◽  
Groundwater Resources ◽  
Phase 1 ◽  
Transboundary Aquifer ◽  
Aquifer System ◽  
Technical Report ◽  
System Assessment ◽  
Transboundary Aquifers ◽  
Assessment Activities

This report presents the activities and results of the assessment activities of the Stampriet Transboundary Aquifer System (Botswana, Namibia, South Africa) undertaken during the Phase 1 (2013-2015) of the GGRETA project. Governance Groundwater Transboundary

scholarly journals Governance of Groundwater Resources in Transboundary Aquifers (GGRETA) project - Overview Brochure

2017 ◽  
Author(s):  
Chloé Meyer
Keyword(s):  
Central Asia ◽  
Case Studies ◽  
Central America ◽  
Southern Africa ◽  
Groundwater Resources ◽  
Phase 1 ◽  
Transboundary Aquifers ◽  
Assessment Activities

This brochure summarises activities and results of phase 1 (2013-2015) of the GGRETA project, in particular by presenting the picture emerging from the assessment activities of the 3 case studies (Stampriet Aquifer in Southern Africa, Trifinio Aquifer in Central America and Pretashkent Aquifer in Central Asia). Governance Groundwater Transboundary

scholarly journals Governance of Groundwater Resources in Transboundary Aquifers (GGRETA) project - Overview Brochure

2017 ◽  
Author(s):  
Marina Rubio
Keyword(s):  
Central Asia ◽  
Case Studies ◽  
Central America ◽  
Southern Africa ◽  
Groundwater Resources ◽  
Phase 1 ◽  
Transboundary Aquifers ◽  
Assessment Activities

This brochure summarises activities and results of phase 1 (2013-2015) of the GGRETA project, in particular by presenting the picture emerging from the assessment activities of the 3 case studies (Stampriet Aquifer in Southern Africa, Trifinio Aquifer in Central America and Pretashkent Aquifer in Central Asia). Governance Groundwater Transboundary

scholarly journals Pretashkent Aquifer -Technical Report. Governance of Groundwater Resources in Transboundary Aquifers (GGRETA) project - Phase 1.

2017 ◽  
Author(s):  
Chloé Meyer
Keyword(s):  
Climate Change ◽  
Central Asia ◽  
Groundwater Resources ◽  
Phase 1 ◽  
Technical Report ◽  
Transboundary Aquifers

This brochure présents the activities and results of the assessment of the Pretashkent Aquifer in Central Asia, undertaken during the phase 1 (2013-2015) of the GGRETA project Climate change Governance Groundwater Transboundary

scholarly journals Governance of Groundwater Resources in Transboundary Aquifers (GGRETA) - Phase 1 – 2013-2015- Main Achievements and Key Findings.

2017 ◽  
Author(s):  
Marina Rubio
Keyword(s):  
Central Asia ◽  
Case Studies ◽  
Central America ◽  
Southern Africa ◽  
Groundwater Resources ◽  
Phase 1 ◽  
Transboundary Aquifers ◽  
Assessment Activities

This brochure présents the main achievements and main results of phase 1 (2013-2015) of the GGRETA project, in particular by presenting a summary of the assessment activities of the 3 case studies (Stampriet Aquifer in Southern Africa, Trifinio Aquifer in Central America and Pretashkent Aquifer in Central Asia). Groundwater

Assessment of groundwater flow system for management of Stampriet Transboundary Aquifer System

2020 ◽  
Author(s):  
Irene Kinoti ◽  
Marc Leblanc ◽  
Albert Olioso ◽  
Maciek Lubczynski
Keyword(s):  
South Africa ◽  
Remote Sensing ◽  
Water Resources ◽  
Water Resource ◽  
Flow System ◽  
Arid Areas ◽  
Time Step ◽  
Transboundary Aquifer ◽  
Aquifer System ◽  
Semi Arid

<p>Groundwater is the main water resource in arid and semi-arid areas. Its evaluation in terms of recharge, discharge, flow system and change in storage is thus vital for management purposes. However, distributed numerical models which are considered as favourable tools for assessment of groundwater resources are often limited by availability of input data especially in arid and semi-arid areas in developing countries where monitoring networks are scarce. Moreover, in case of transboundary aquifers, political, institutional, cultural, socio-economic differences among countries make management of groundwater even more complex.</p><p>Remote sensing is a handy tool for monitoring water resources in data scarce areas. This study entails application of remote sensing data in developing a distributed integrated hydrological model for Stampriet Transboundary Aquifer System using MODFLOW-NWT coupled with the Unsaturated Zone Flow (UZF1) Package.</p><p>Stampriet Transboundary Aquifer is a multi-layered aquifer system shared between Namibia, Botswana and South Africa. The aquifer system consists of three aquifers, characterized by low transmissivity and low storage, intercalated by two aquitards. Conceptually, the physical processes taking place in this system are reasonably understood in Namibia and not as much in Botswana and South Africa. However, quantification of water resources and fluxes is still limited.</p><p>The aquifer system is mainly exploited in Namibia for socio-economic growth, where abstraction from storage has led to decline in local groundwater level. Water quality constraints have restrained its usage in South Africa, while in Botswana the potential for available resources is likely to be exploited, but there is not enough data for making firm decisions.</p><p>A numerical model has been set – up in transient conditions at daily time step and calibrated with groundwater levels as the state variables and satellite rainfall and potential evapotranspiration as the model driving forces. The calibrated model provides spatio-temporal water flux dynamics as well as water balances and hence an understanding of the groundwater-resource dynamics and replenishment. The results are compared to analysis of GRACE data to further constrain the model. This information is useful for proper management of the transboundary water resource as well as for policy making.</p>

scholarly journals A transboundary aquifer of potential concern in Southern Africa

Water Policy ◽  
2017 ◽  
Vol 19 (6) ◽  
pp. 1160-1171 ◽  
Author(s):  
Modreck Gomo ◽  
Danie Vermeulen
Keyword(s):  
South Africa ◽  
Conceptual Understanding ◽  
Groundwater Resources ◽  
Theoretical Background ◽  
Economic Activities ◽  
Transboundary Aquifer ◽  
Cross Border ◽  
Sustainable Exploitation ◽  
Raising Awareness ◽  
Competing Demands

Abstract Tuli Karoo transboundary aquifer (TBA) is shared between Botswana, South Africa and Zimbabwe in the Southern African Development Community (SADC) region. The TBA provides groundwater resources for various economic activities. Irrespective of the value offered by this TBA, there is very little research that has been conducted to improve understanding of the physical system and potential cross-border impacts that can result from exploitation of the aquifer. In the wake of this limited research, this paper uses theoretical background and conceptual understanding to highlight some of the activities that have the potential to cause conflicts within the TBA. This article presents and discusses the current hydrogeological conceptual understanding of the Tuli Karoo TBA system, social and economic activities and their potential impacts on the TBA. Based on the discussions of various scenarios, it can be argued that the potential for groundwater cross-border flow and impacts exist within the TBA. With the ever-increasing and competing demands for fresh water and unpredictable rainfall patterns in the region, the possibility of future conflicts cannot be ruled out. It is hoped that this study can assist in raising awareness about the need to address aspects of sustainable exploitation and management of the TBA.

scholarly journals The U.S.-Mexico Transboundary Aquifer Assessment Program as a Model for Transborder Groundwater Collaboration

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 530
Author(s):  
Elia M. Tapia-Villaseñor ◽  
Sharon B. Megdal
Keyword(s):  
Groundwater Management ◽  
Groundwater Resources ◽  
Management Strategies ◽  
Sustainable Use ◽  
The United States ◽  
Lessons Learned ◽  
Joint Effort ◽  
Transboundary Aquifer ◽  
Assessment Program ◽  
Transboundary Aquifers

The assessment of transboundary aquifers is essential for the development of groundwater management strategies and the sustainable use of groundwater resources. The Transboundary Aquifer Assessment Program (TAAP) is a joint effort by the United States and Mexico to evaluate shared aquifers. This study examines the TAAP Cooperative Framework as a guide for further transboundary groundwater collaboration. We compared lessons learned from six transboundary aquifers that currently have mechanisms for groundwater collaboration to identify common elements of collaboration. Though the TAAP Cooperative Framework governs an assessment-only program, the elements of collaboration included are consistent with the principles of other institutional agreements around the world. Importantly, all the analyzed agreements included a knowledge-improvement phase, which is the main objective of the TAAP Cooperative Framework. The present study finds evidence of successful outcomes within the TAAP Cooperative Framework consistent with available transboundary groundwater management agreements, demonstrating that this approach is suited to serve as a model for those wishing to engage in transborder aquifer assessments. Furthermore, the TAAP elements of collaboration can help to establish the meaningful and robust binational cooperation necessary for the development of U.S.-Mexico groundwater management agreements at the aquifer level.

scholarly journals Depletion of groundwater resources under rapid urbanisation in Africa: recent and future trends in the Nairobi Aquifer System, Kenya

2020 ◽  
Vol 28 (8) ◽  
pp. 2635-2656
Author(s):  
Samson Oiro ◽  
Jean-Christophe Comte ◽  
Chris Soulsby ◽  
Alan MacDonald ◽  
Canute Mwakamba
Keyword(s):  
Negative Impact ◽  
Groundwater Resources ◽  
Climatic Data ◽  
Groundwater Abstraction ◽  
Management Scenarios ◽  
Aquifer System ◽  
Groundwater Levels ◽  
Future Evolution ◽  
Level Data ◽  
Groundwater Assessment

AbstractThe Nairobi volcano-sedimentary regional aquifer system (NAS) of Kenya hosts >6 M people, including 4.7 M people in the city of Nairobi. This work combines analysis of multi-decadal in-situ water-level data with numerical groundwater modelling to provide an assessment of the past and likely future evolution of Nairobi’s groundwater resources. Since the mid-1970s, groundwater abstraction has increased 10-fold at a rate similar to urban population growth, groundwater levels have declined at a median rate of 6 m/decade underneath Nairobi since 1950, whilst built-up areas have increased by 70% since 2000. Despite the absence of significant trends in climatic data since the 1970s, more recently, drought conditions have resulted in increased applications for borehole licences. Based on a new conceptual understanding of the NAS (including insights from geophysics and stable isotopes), numerical simulations provide further quantitative estimates of the accelerating negative impact of abstraction and capture the historical groundwater levels quite well. Analysis suggests a groundwater-level decline of 4 m on average over the entire aquifer area and up to 46 m below Nairobi, net groundwater storage loss of 1.5 billion m3 and 9% river baseflow reduction since 1950. Given current practices and trajectories, these figures are predicted to increase six-fold by 2120. Modelled future management scenarios suggest that future groundwater abstraction required to meet Nairobi projected water demand is unsustainable and that the regional anthropogenically-driven depletion trend can be partially mitigated through conjunctive water use. The presented approach can inform groundwater assessment for other major African cities undergoing similar rapid groundwater development.

Sign in / Sign up

Export Citation Format

Share Document