RWSN Thèmes

Développement de l’accès durable à l’eau souterraine

L’eau souterraine permet à un nombre significatif d’habitants en milieu rural d’avoir accès à une eau potable sûre, et cela va continuer à être le cas dans le future. L’eau souterraine est relativement omniprésente, mais ses caractéristiques varient énormément et son exploitation est souvent entreprise avec une compréhension limitée de l’hydrogéologie et sans une évaluation suffisante de la ressource. Dans certains endroits, une utilisation intensive de la ressource en eau souterraine pour l’agriculture a conduit à des prélèvements trop importants et a eu pour conséquence que cette dernière est devenue hors d’atteinte pour un usage domestique du fait que les niveaux des nappes ont baissé. Il y a également des régions où la qualité de l’eau souterraine n’est pas adaptée à une consommation humaine (par exemple à cause de concentrations élevées en arsenic, fluor, fer ou nitrate, ou du fait de la contamination liée à l’homme comme un assainissement faible ou un déversement accidentel de pétrole ou de produits chimiques).

L’objectif du thème « Développement de l’accès durable à l’eau souterraine » est le suivant : les ressources en eau souterraines sont bien prises en considération et utilisées de manière durable pour développer l’approvisionnement en eau potable ». Le thème a trois sous-thèmes :

  • Les technologies des pompes manuelles ;
  • Les forages à moindre coût ;
  • La gestion à moindre coût des ressources en eau

Related Resources

An Assessment of the EMAS Pump and its Potential for Use in Household Water Systems in Uganda

University of South Florida MSc Thesis

Rural improved water supply coverage in Uganda has stagnated around 64% for a number of years and at this point more than 10 million rural people do not have access to an improved drinking water source. It has been recognized that progress toward improved water supply coverage and increased service levels may be gained through Government and nongovernmental organization (NGO) support of private investment in household and shared water supplies, commonly known as Self-supply.
There are indications that low-cost wells and underground rainwater tanks are applicable in many parts of Uganda and could be paired with an EMAS Pump to achieve significant affordability for Self-supply household water systems. Recommendations are provided in terms of the feasibility of introducing the EMAS Pump as a part of Self-supply strategies in Uganda. | more information »

UPGro abstracts from 41st IAH Congress, Sep 2014

The abstracts below were submitted and presented at the 41st Congress of the International Association of Hydrogeologists in Marrakech (15-19 Sep). They draw on work funded through the UPGro programme.

DISCLAIMER: This is a non-RWSN publication and endorsement by RWSN or any of its member organisations should not be inferred. | more information »

Improving access to safe drinking water: Prospection for low-fluoride sources

Brief report presenting main findings - Addis Ababa, August 2014

This report presents the key findings from the UPGro catalyst project: "Improving access to safe drinking water_prospection for low-fluoride sources Groundwater". It covers the background of natural fluoride levels in groundwater in the Ethiopian Central Rift Valley and looks at some defluoridation interventions, including the use of bone char. The costs, benefits and main findings and lessons are presented.

DISCLAIMER: This is a non-RWSN publication and endorsement by RWSN or any of its member organisations should not be inferred. | more information »

Manually Drilled Boreholes: Providing water in Nigeria’s Megacity of Lagos and beyond

The Rural Water Supply Network (RWSN) is continuing its work on cost-effective boreholes under its theme of Sustainable Groundwater Development. The network is supporting stakeholders to improve borehole drilling policies and practices. As part of this effort, UNICEF and Skat Foundation are collaborating on manual drilling in Africa. The 2012 to 2014 collaboration documented and facilitated exchange on the introduction and professionalization of manual drilling in more than 20 countries.

This report is about the role played by manually drilled boreholes in meeting water needs in Lagos city, Lagos State and more widely in Nigeria. By examining Nigeria, the report draws out key lessons for those who are promoting, or trying to regulate manual drilling in other countries. It is hoped that this report, and the accompanying photo/video documentary and blogs will trigger action to better support manual drilling efforts in Lagos, in Nigeria and in other countries. | more information »

Code of Practice for Water Well Construction

NIGERIAN INDUSTRIAL STANDARD

This Nigerian Code of Practice for Well Construction was elaborated by the Technical Committee for Water Well Construction.
Groundwater development is one of the sources of the Federal and State Governments Water Supply Intervention Programmes under which government embarked on construction of open wells and boreholes in order to increase access to portable water to Nigerians. However, water well construction is still characterized by cases of “failed hole”, poor quality service, and unprofessional conduct of drillers and lack of established code to regulate the practice of water well drilling in Nigeria. These are serious concern to government, donor agencies and sector stakeholders who see them as militating factors towards attainment of water supply project objectives in particular and Millennium Development Goals (MDGs) in general. This Code of Practice was therefore elaborated to provide the framework for water well construction in Nigeria.
In the elaboration of this Code of Practice, reference made to Nigerian Industrial standards and National standards of other countries are acknowledged. | more information »

Handpumps: where now?

A synthesis of online discussions (2012-2014)

In 2012, RWSN established Dgroups.org as its online electronic platform for membership and discussion. The groundwater and handpump groups have been among the most active communities. The number and depth of contributions has been rich, and several members have asked for a synthesis of the discussions. They main topics that emerged were:
1. Water Quality - particularly iron and pump corrosion
2. Procurement, Quality Control and Installation
3. Sustaining handpumps - what is the average lifespan of a handpump?
4. Handpump component failures and the need to redesign public domain designs
5. The politics of new pump designs: the Squirrel Cage Pump

Join the debate at on dgroups, using the links below. | more information »

UNICEF Hand Pump R&D Project in Ranga Reddy District Andhra Pradesh

Concluding Report

This Project represents the next generation of systematic development of hand pump components with modern materials under UNICEF’s sponsorship, both intellectually and financially. This Project also establishes the relevance of Ranga Reddy Test Area for hand pumps, where field testing of hand pumps under deep static water table conditions has been undertaken for many years. Hence, the results of this project’s field trials supercede similar work done in the past on similar materials and under similar or more favourable physical conditions.

DISCLAIMER: This is a non-RWSN publication and endorsement by RWSN or any of its member organisations should not be inferred. | more information »

Water quality testing to establish whether high iron originates from corrosion of pump components or the aquifer

Method Sheet

The Problem:
(1) Production of a red/brown coloured discharge first thing in the morning. This is caused by the discharge of corrosion products that have accumulated in the well during the night when there was no pumping. In most cases, the discharge clears up as the solid corrosion products are removed from the well.

(2) Discolouration of water which was clear when pumped, but develops a red/brown discolouration after a few minutes to hours. This is the result of the oxidation of ferrous iron (Fe2+) to ferric iron (Fe3+), which causes the precipitation of iron hydroxides and oxides. This could be caused by either naturally high ferrous iron in the aquifer, or the addition of iron to the well water from corrosion of handpump components. | more information »

Handpumps Testing and Development: Progress Report on Field and Laboratory Testing

Work Bank Technical Paper Number 29

Rural Water Supply Handpumps Project

The UNDP/World Bank Project for the Testing and Technological Development of Handpumps for Rural Water Supply is field testing a total of 2860 pumps of 76 pump types in 17 countries. The Project has also completed full tests of 23 pump models at the Consumers' Association Laboratory in the United Kingdom and plans more tests both in the U.K^. and in laboratories elsewhere. Emphasis has been placed on the development of pumps which are suitable for "Village Level Operation and Maintenance" (VLOM).

The current report reviews all Project activities and conclusions to date, concentrating on field work but also summarizing laboratory activities. It relates significant findings in the development and use of VLOM handpumps. The report also reviews activities essential for the success of rural and urban fringe handpump programs, including community participation, caretaker training, and proper construction of wells and boreholes. | more information »

India Mark II hand pumps with open top cylinders in low lift application

Maintenance data analysis from 1986 till March, 1992

Phase 1 of the Orissa Drinking Water Supply project took place from August 1985 to December 1987 and resulted in the installation of about 1600 handpumps on tube wells. In Phase II of the project, 2000 handpumps were installed by August 1989 in 5 blocks and a further 600 pumps installed in another 4 blocks.

This paper confines itself to the analysis of the maintenance data of the 29 India Mark II pumps since their installations in 1986 and up to the 31st March 1992.

DISCLAIMER: This is a non-RWSN publication and endorsement by RWSN or any of its member organisations should not be inferred. | more information »