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Recommendations for construction of shallow wells in Tanzania
2000 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The HESAWA Programme is an ongoing project in the regions around Lake Victoria in Tanzania. One of the main activities in the programme is the construction of shallow wells. However, the access to drinking water is not of satisfaction due to that some of the wells dry out. Today, one of the criterions when constructing shallow wells within the Programme is that they should be dug to the minimum depth of 10 metres. The main objective of this study was to investigate whether or not the depth criterion is appropriate. The study also included observation and recognition of other potential problems connected to the shallow wells constructed within the HESAWA Programme. Moreover, observations of the current conditions concerning the water quality were to be done. In total 100 wells in two different areas, the Bukoba Rural District in Kagera Region and the Kwimba District in Mwanza Region were investigated. All wells were visited and visually assessed. The users were interviewed and documented data of the wells were reviewed. Both wells which had low yield or were dry and functioning wells were investigated and a statistical comparison of the results from the two categories was carried out. It was concluded that the depth criterion of 10 metres for the construction of shallow wells within the HESAWA Programme is appropriate and should remain. Furthermore, a higher limit than the current yield of 800 l/h at the survey, would be more appropriate as a restriction when a tube well is to be constructed. The screen should be placed in connection to the water-bearing layer. Many surveys at different sites should be performed before the location of a new well is chosen, in order to find the best site in the area. The surveys should be drilled to the same depth as the planned depth of the well. The wells, especially ring wells, should be constructed in the dry season, when the water table is at its lowest level. The conditions for obtaining a sufficient water quality were good in the investigated areas.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Shallow wells, Tanzania, Drinking water, Ring wells, Tube, wells, Dry, Low yield, HESAWA, brunnar
Keyword [sv]
URN: urn:nbn:se:ltu:diva-52911ISRN: LTU-EX--00/292--SELocal ID: 9fd795d6-5215-4608-a57c-522d90710d12OAI: diva2:1026283
Subject / course
Student thesis, at least 30 credits
Educational program
Environmental Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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