RWSN Resources

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Analyse des coûts et détermination des prix Guide à l’intention des entreprises de forage d’eau

Downloads: 219


Author: DANERT K., LUUTU A., CARTER R., OLSCHEWSKI A.
Year of Publishing: 2014
Publisher: Rural Water Supply Network
Institution: RWSN/UNICEF

La présente note pratique est destinée aux entreprises de forage et aux sociétés qui gèrent ou participent à des projets de forage. Grâce à une approche par étape, elle donne des directives claires sur la manière d’analyser les coûts et de déterminer les prix pour la réalisation de forages. Elle fournit également des conseils de ges-tion en soulignant les réalités propres à de nombreux pays d’Afrique subsaharienne. Sa lecture vous permettra d’être mieux à même de calculer les coûts des forages, de réfléchir aux prix et de faire face aux réalités commerciales.

L’analyse des coûts et la détermination des prix passent par cinq étapes: (1) l’identification des coûts de fonctionnement de base de votre entreprise, (2) l’analyse du dossier d’appel d’offres, (3) la définition des catégories de coûts, (4) le calcul des coûts et (5) la détermination des prix. Lors de chaque étape, plusieurs points clés doivent être pris en compte. Les coûts se décomposent comme suit: implantation du forage, amenée, forage, équipement/complé¬tion, développement du forage/test de pompage et installation de la pompe. La présente note fournit des exemples pratiques et éprouvés qui permettent de comprendre aisément la méthode d’analyse des coûts et aborde également les devis quantitatifs, les procédures d’appel d’offres et la gestion des risques et des incertitudes. Les auteurs fournissent par ailleurs des conseils pour une gestion efficace de la procédure.

Professional Water Well Drilling A UNICEF Guidance Note

Downloads: 998


Author: Danert K., Gesti Canuto J.
Year of Publishing: 2016
Publisher: Skat Foundation
Institution: Unicef

This guidance note provides practical guidance for organisations and individuals that are trying to raise the professionalism of groundwater development in Africa. The guidance note is mainly concerned with rural and small towns’ water supplies but is mindful of the huge challenges faced by supplies in many growing African cities dealing with problems of groundwater quantity and quality.

DOI: 10.13140/RG.2.2.21914.64964

Manual Drilling Compendium 2015 RWSN Publication 2015-2

Downloads: 1501


Author: DANERT K.
Year of Publishing: 2015
Publisher: Skat
Institution: Skat

Manual drilling refers to several drilling methods that rely on human energy to construct a borehole and complete a water supply. The various techniques can be used in areas where formations are quite soft and groundwater is relatively shallow.

Manual drilling can provide safe drinking water. The equipment can easily be transported to remote, or difficult to serve populations which would otherwise be left behind. The lower costs compared to machine drilling are appreciated by households, businesses and governments. Manual drilling also provides local employment.

Manual drilling methods are being used to provide water for drinking and other domestic needs at least 36 countries around the world. In some places, manual drilling methods are well established.

The compendium provides a useful overview for those wishing to further examine the impacts and challenges of manual drilling, and, more importantly, improve practices on the ground. It is hoped that the document will spur others to undertake fur-ther studies as well as research to document stories and analyse the promotion, uptake and use of manually drilled boreholes. In addition, the compendium should also enable those promoting manual drilling to realise that they are certainly not alone in their endeavours!

Chad’s Growing Manual Drilling Industry

Downloads: 140


Author: DANERT K.
Year of Publishing: 2015
Publisher: Skat Foundation
Institution: Skat Foundation

In Chad, manual drilling is a growing industry. This report provides an overview of manual drilling in Chad today. The report is intended to stimulate interest in more research, documentation and action regarding the diffusion of manual drilling within the country and its implications. The technology is increasing in popularity and spreading within Chad, including in the capital N’Djamena. Private enterprises and non-governmental organisations are promoting manual drilling and water users are investing in their own manually drilled wells.

Webinar Series 2014 (UNICEF- RWSN) on Manual Drilling/Webinaires sur le sujet de Forage Manuel Five Interactive webinars, which aim to promote South-South sharing. Une séries de cinq (5) Webinaires sur le sujet de Forage Manuel.

Downloads: 1689


Author: DANERT K
Year of Publishing: 2014
Publisher: UNICEF/RWSN
Institution: UNICEF/RWSN

Manual Drilling has now been successfully implemented in many countries, with several taking it to scale. The webinars will provide participants with an opportunity to learn from the successes and challenges experienced from different organisations and trigger discussion, with time for questions and exchange of perspectives.
Webinars are in both French and English, with corresponding summaries also being made available in both languages.

Le but est de partager vos expériences et contribuer au débat dans la région Sud
Beaucoup de pays ont achevé de succès dans leur entretien du programme de forage manuel. Plusieurs de ces pays maintenant mettent à l’échelle le programme. Les sessions auront deux parties. Dans la première partie, vous apprendrez des succès et des difficultés dont UNICEF et ses partenaires font face à en ménageant un programme de forage manuel. Dans la deuxième partie, vous êtes invitez à poser des questions et faire des commentaires. Les sessions sont en Anglais et en Français; aussi que les matériaux des présentations et des discussions.

A Comparative Evaluation Of Ultra Deep-Well Handpumps MSc THESIS Academic Year: 2011 - 2012

Downloads: 240


Author: CORNET, L.
Year of Publishing: 2012
Publisher: Cranfield University
Institution: SCHOOL OF APPLIED SCIENCES Water Management: Community Water and Sanitation

Permission has been granted to publish on the RWSN website by the author, Lucas Cornet, and by Dr Alison Parker (Cranfield University) and Erik Harvey (WaterAid)

Abstract

Handpump technology is documented as being the best option for the water supply of rural communities in the developing world. However, it has been observed that the amount of available handpump models significantly drops as water tables get deeper. Many handpumps are therefore expected to operate beyond their design specifications, which is responsible for many failures of handpump projects. This paper compares a total of 12 ultra deep-well handpumps (UDWHPs), with a pumping lift higher than 60 m, in terms of technologies, materials, outputs, costs and maintenance potentialities.

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

A comparative study between “Rope pumps” and conventional piston pumps on water quality and other sustainability parameters Appropriate technologies for rural water supply

Downloads: 110


Author: COLORU, B., S. MGAYA and R. POZZI-TAUBERT
Year of Publishing: 2012
Publisher: Fondazione ACRA-CCS, SHIPO
Institution:

In Tanzania there now are some 5000 Rope pumps both for small communities and Households. To compare Rope pumps with piston pumps like Afridev and Nira pumps regarding water quality, cost per capita and other aspects, the organisation ACRA effected a Comparative study. Some conclusions of the study are:
- Rural communities do not prefer piston pumps above Rope pump
-The water quality of tested Rope pumps is lower than Piston pumps but this is mainly due to bad installation. If installed right there is not much difference in water quality.

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

Hand dug Shallow Wells SERIES OF MANUALS ON DRINKING WATER SUPPLY - VOLUME 5

Downloads: 407


Author: COLLINS, S.
Year of Publishing: 2000
Publisher: Skat
Institution:

This Manual, Volume 5 in the SKAT series on Rural Water Supply, deals with the planning, construction, management, operation and maintenance of handdug wells for water supply to communities in the South. It is intended to be used by planners, engineers and technicians in the Water Sector, with the aim of facilitating the decision on the type of technology to use in a given situation and, where relevant, to outline the implementation of that technology.
It is hoped that the manual will also be useful to those involved in village liaison work, in giving an idea of the technical aspects related to improving village water supplies.

VLOM for Rural Water Supply: Lessons from Experience Task No: 162

Downloads: 49


Author: COLIN, J.
Year of Publishing: 1999
Publisher: Loughborough University
Institution: WEDC

The purpose of this study is to review the literature on the experience with an approach to rural water supply known as Village Level Operation and Maintenance Management (VLOM). The following issues are addressed:
· How useful has the concept of VLOM proved to be?
· What evidence is there of success in achieving the objectives of the VLOM approach?
· Has VLOM been incorporated into later concepts such as “community management” of rural water supply?

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

Baptist Drilling

Downloads: 108


Author: CLOESEN, P.
Year of Publishing: 2007
Publisher: unpublished
Institution:

Baptist drilling is similar to hand sludging, with some percussion drilling combined. The main difference is that while sludging relies on a person's hand at the top of the drill pipe as a valve, the Baptist method uses on a valve at the bottom of the drill pipe.

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

EMAS Drilling

Downloads: 76


Author: CLOESEN, P.
Year of Publishing: 2007
Publisher: unpublished
Institution:

The drilling method developed by the Escuela Móvil de Agua y Saneamiento (Mobile School for Water and Sanitation) in Bolivia is a hybrid between washboring, percussion and rotary drilling. It permits to drill through all kinds of loose soils, as ell as consolidated materials and light rock. It will not, however, penetrate hard original rock or boulders (e.g. ancient river beds underground)

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

Siting of Drilled Water Wells - A Guide for Project Managers RWSN Publication 2014-11

Downloads: 1473


Author: CARTER, R., CHILTON, J., DANERT, K. & OLSCHEWSKI, A.
Year of Publishing: 2014
Publisher: RWSN
Institution:

This field note has been written for managers of water supply programmes and projects. It provides a step by step guide on the siting of drilled water wells. As a first step, the essential requirements for a simple groundwater model are set out, including some basic explanations to help the reader establish a sound understanding of hydrogeology.

Drilling Cost Estimation and Cost-Saving Analysis

Downloads: 272


Author: CARTER, R. C.
Year of Publishing: 2009
Publisher: RWSN
Institution: WaterAid

Description of the RWSN/Cranfield University Drilling Costs Model v2.5 and anlysis of cost saving opportunities. Note that this paper was presented at the National Workshop on Cost-Effective Boreholes in Khartoum, Sudan in November 2009.

Drilling for Water in Ethiopia Volume 1 - Main Report

Downloads: 212


Author: CARTER, R. C.
Year of Publishing: 2006
Publisher: RWSN
Institution: WSP, Gov of Ethiopia

This study of Ethiopia’s borehole construction sector provides an in-depth, integrated understanding of the sector, boreholes costings and analysis.
This study of Ethiopia’s borehole construction sector provides an in-depth, integrated understanding of the sector, boreholes costings and analysis. In addition, new approaches to the modelling of the qualitative and quantitative issues involved is presented. This two volume document is the comprehensive report of the study, including the inputs made by the participants at a final workshop in Addis Ababa in December 2005.

Ethiopia Cost Effective Boreholes Vol 2.

Downloads: 75


Author: CARTER, R. C.
Year of Publishing: 2006
Publisher: RWSN
Institution: WSP, Gov of Ethiopia

This study of Ethiopia’s borehole construction sector provides an in-depth, integrated understanding of the sector, boreholes costings and analysis. In addition, new approaches to the modelling of the qualitative and quantitative issues involved are presented.
This two volume document is the comprehensive report of the study, including the inputs made by the participants at a final workshop in Addis Ababa in December 2005.

Le forage d'eau à faibles coûts en dix étapes Étude des coûts de forage en Éthiopie

Downloads: 52


Author: CARTER, R. C.
Year of Publishing: 2006
Publisher: RWSN
Institution: WSP

Développer l’accès à l’eau souterraine est une priorité fondamentale pour l’Afrique subsaharienne. La réduction du coût des forages classiques et de leur équipement est un moyen d’y parvenir. La présente note rend compte d’une étude récemment conduite en Éthiopie et expose certaines des méthodes qui permettraient de réaliser cet objectif.

Private Sector Participation in Low Cost Water Well Drilling in Uganda Knowledge and Research (KAR) Project R7126 FINAL REPORT

Downloads: 273


Author: CARTER, R. C.
Year of Publishing: 2001
Publisher: Cranfield University
Institution: Silsoe College

This report describes the activities, findings, implications, and future plans of a project, initiated by Cranfield University (Silsoe, UK) entitled “Private Sector Participation in Low Cost Water Well Drilling”. The project was funded by DFID from July 1998 to June 2001, with additional funding partners (Government of Uganda, DANIDA, SIDA, UNICEF, Water Aid, and an anonymous donor) joining at various stages throughout this
three-year period.

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

Ten-step Guide Towards Cost-effective Boreholes Case study of drilling costs in Ethiopia

Downloads: 266


Author: CARTER, R. C.
Year of Publishing: 2006
Publisher: RWSN
Institution: WSP

Increasing access to groundwater is a priority for sub-Saharan Africa. One key to this is to reduce the costs of conventional drilling and borehole construction. This field note, describing a recent study in Ethiopia sets out some of the ways in which this may be done.

Towards cost-effective groundwater development in Sudan and in sub-Saharan Africa Personal Report of Workshop on Cost-Effective Boreholes, Khartoum, November 2009

Downloads: 72


Author: CARTER, R. C.
Year of Publishing: 2009
Publisher: RWSN
Institution:

Presentation addressed the issue of drilling cost estimation. Drilling companies and their clients need a systematic procedure for quantifying the costs of drilling.

Human-Powered Drilling Technologies an overview of human-powered drilling technologies for shallow small diameter well construction, for domestic and agricultural water supply

Downloads: 387


Author: CARTER, R. C.
Year of Publishing: 2005
Publisher: Cranfield University
Institution: Silsoe College

This paper briefly describes a range of primarily human-powered technologies for well construction which lie between (in cost, complexity of technology, and capability) hand-digging and ‘conventional’ small or large, truck- or trailer- mounted drilling rigs. These human-powered technologies are designed to construct small diameter wells, at costs closer to hand-digging than to conventional drilling.

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

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