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

Sudan Drilling Status Report 2012

Development of Code of Practice for Cost Effective Boreholes and Drilling Strategy

The Government of Sudan has developed National and State Water, Sanitation and Hygiene Strategic Plans for 2012 to 2016. Under the plans it is envisaged that several thousands of boreholes will need to be drilled annually to meet the water supply targets. The Government with UNICEF support developed 10 Principles for Cost Effective Boreholes which were adopted by stakeholders at a workshop in Khartoum in 2009 as the framework for future borehole provision in the country.
This is the report of a study to evaluate the status of drilling and drilling practices within the framework of the 10 principles and from it develop a National Code of Practice for Borehole Construction and a National Drilling Strategy for Sudan. Information were collected from the public and private sectors and the NGOs in 8 states.

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

Hand drilling a shallow tube-well and fitting a simple “Bailer-bucket” in Zimbabwe

The construction of the lighter duty, simple hand operated drilling rig has been described in another manual and was designed for drilling shallow tube wells in softer soil formations, which occur in some areas of Zimbabwe. Currently the drilling stems extend to a maximum of 12m. Staff members of the Ministry of Health and Child Welfare are familiar with local shallow ground water conditions in Zimbabwe. A depth of 12m is suitable for the use of this simple rig in combination with simple water raising devices like the Bailer-bucket, Bucket Pump and Blair Pump. | more information »

Technical Guidelines for Construction and Maintenance of Hand Dug Wells

Sierra Leone

This document represents the official guidelines of the Government of Sierra Leone on the issue of the construction and maintenance of hand dug wells.

This publication is intended for water sector practitioners and managers who coordinate and oversee water supply service delivery. It is the outcome of a partnership between the Ministry of Water Resources, Water and Sanitation Program (WSP), and a number of implementing agencies working in the WASH sector in Sierra Leone.

If this publication can contribute to permanent and lasting water points in Sierra Leone, and better standards of construction, then it will have achieved its purpose.

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

RWSN Annual Report 2013

Enabling practitioners, professionals and ultimately water users to make informed decisions on how to improve and maintain access to safe water in rural areas.

The Rural Water Supply Network (RWSN) is a global network of professionals and practitioners. It works to raise standards of knowledge as well as technical and professional competence in rural water supplies and thus fulfil the vision of sustainable rural water services for all.

The year 2013 witnessed the dramatic growth in the number of members from 2,567 to over 5,125. Members are from 124 different countries. The network now also provides the opportunity for organisation membership, a mechanism that should strengthen RWSN and improve its vibrancy over the coming years.

Confidence in online exchange and sharing has grown, evidenced by extensive participation in e-discussions, whether formally structured, or as individuals respond to each other’s queries and comments. The sustainable Groundwater Development, Handpump Services and Mapping communities have been notably vibrant in 2013. | more information »

Tapping Treasure: Cost-Effective Boreholes in Sierra Leone - Project Report 4

March 2014

The eight-month cost-effective boreholes project funded by the Department of International Development through the WASH Facility of Sierra Leone ended in February 2014. The project completed on a high note, with a short course on drilling supervision which was attended by 21 stakeholders from Government and NGOs. The practical, hands on nature of the course was particularly appreciated by those who participated. For many who attended, it was their first time to actually witness borehole drilling in practice. Some participants had already been in the role of drilling supervisor before, but most of them had not been sure of how to undertake this job in a professional manner. The exposure was important not only for those who may actually undertake borehole drilling supervision in the future, but also for the senior staff who will be responsible for managing projects and supporting drilling supervisors in the future. | more information »

RWSN Handpump Survey 2013

Summary of Findings

Manual pumps have been used for centuries but this simple technology remains the mainstay of rural water supplies in many countries. The Handpump Technology Network (which later became RWSN) was set up in 1992 to promote collaboration and standardisation so that handpumps could provide more reliable and better quality rural water services.

This survey is aimed at practitioners in government, NGOs, private sector and development partners who are directly involved in rural water service implementation, or who are involved in the procurement of handpumps or spare parts (as either a buyer or seller). | more information »

Short Course: Drilling Supervision

Cost-Effective Boreholes

A five-day course for engineers and WASH professionals in Sierra Leone.
The objectives of the course are to:
- understand:
- the importance of effective drilling supervision
- the nature of groundwater occurrence
- the steps and actions required in full time supervision
- the steps and actions required in part time or milestone supervision

- be able to quality assure and certify drilling records
- be able to undertake borehole construction supervision! | more information »

Procurement & Gestão de Contratos de Construção de Furos de Água

Um Guião para Fiscais e Gestores de Projectos

A alta taxa de furos de água inoperacionais em muitas partes do mun-do é atribuído, em parte, à falta de profissionalismo no sector de perfu-ração. A fim de aumentar o acesso a um abastecimento de água segu-ro e sustentável, empreiteiras de perfuração competentes e experientes devem ser contratados. Da mesma forma, o equipamento adequado é necessária e consultores experientes são necessários para supervisionar a construção. | more information »

Fiscalização de Furos de Água

Um guião para Fiscais

Boa fiscalização da execução de furos de água é essencial para a provisão de furos de água de longa duração. Estes apontamentos (guia) servem para ajudar aos geólogos e engenheiros encarrega-dos da fiscalização da construção de furos, bem como aos gestores de projectos. Estes podem ser usados para preparar-se uma for-mação, e também como um manual. | more information »

The Zimbabwe Bucket Pump

An update

The “Bucket Pump” is a water lifting device which uses a tubular bucket to raise water from a tubular well – known as a tube well. These wells, usually drilled with a hand auger. They work best in shallow aquifers, where the soil is soft and easy to penetrate. Where conditions are suitable a well can be hand drilled in a few hours, cased with a PVC pipe, which is surrounded by a gravel pack. The pipe ascends through a concrete head-works consisting of an apron and water run-off. The pipe is closed off at the top lid. The tubular buckets were fitted with a non-return valve at the base. At first the tube-buckets were raised on a rope directly by hand. Later models used a windlass system to raise the bucket. Initially these windlass adapted bucket pumps were hand made using treated gum poles as windlass supports. Later the concept was commercialised, which shadowed the earlier work and made the device more expensive. | more information »