CASE C 4 Deki Andu water supply Eritrea

CASE C 4 Deki Andu water supply Eritrea by Manfred Arlt NCA

CASE Water supply Deki Andu Eritrea • Eritrea is an arid and semi-arid country and is not endowed with rich water recourses. Only 54% of population living in rural areas have access to safe water supply http: //www. eoearth. org/article/Water_profile_of_Eritrea). Groundwater is the major water source. This case study is related to a potable water supply project in a rural village in Eriteria, Deki Andu. The inhabitants of, have acquired potable water supply as a result of the implementation of a project at a cost of 2. 8 million Nakfa (2. 8 mill. Nakfa is about 1 mill NOK). The project was supported by Norwegian Church Aid (NCA). The subsequent slides gives you more information about the project. In order to make you familiar with the design and planning aspects of rural water supply projects some questions have been formulated in the next two slides. Use information from these ppt slides and the lectures week 42 and 43 as well as the STEP UMB website to solve the case.

Questions 1. How big must be the catchment area for assuring an adequate water supply for the population at the end of the design period of 10 years with a population growth rate of 3% per year and a water demand of 40 l/p. d? The infiltration to groundwater can be assumed to be 5% of the total annual rainfall. Future population can be calculated using formula: Future population Pn Pn = Po (1 + r)n n = years time r = population growth rate (assume 0. 03) 3. What are good features for hand-dug well to minimize the risk of contamination of the water? 4. Why are gender issues important in such projects? 1. List possible impacts of such a water scheme on women, girls, boys and men’s daily life and long term impacts. 2. 3. 4. 5. Outline the design of the water system: Which capacity should a submersible pump have? What is a proper size of the water storage tank? What dimensions and types of pipes do you suggest to use? 6. 6. Outline an operation and maintenance (O&M) plan for the water supply system. 7. 7. What are important issues for the sustainability of such a water scheme? 8.

Thank you for your attention

http: //en. wikipedia. org/wiki/Groundw ater_recharge