A comparative assessment of selected raw water intake systems in Rwanda

2012 ◽  
Vol 7 (2) ◽  
Author(s):  
I. Nhapi ◽  
A. J. Nshimiyimana ◽  
U. G. Wali ◽  
F. O. K. Anyemedu ◽  
J. J. Kashaigili

After the genocide of 1994, Rwanda has been struggling to contain urban migration and its pressures on existing facilities. Water supply coverage is low at 76% in urban areas and 68% in rural areas. This implies that huge investments are required to meet the Millennium Development Goals on water supply and sanitation. This study was conducted to assess the existing problems of raw water intake systems at Yanze and Nyabarongo intakes in Kigali; Shyogwe intake in Ruhango District; and Kadahokwa intake in Huye District. The study was in response to high amounts of sediments in raw water which literally clogged the intake systems for a number of days, resulting in erratic water supplies to the residents in the rainy season. The study focused on performance problems of the intake systems, raw water turbidity variations and the assessment of how environmental concerns could be addressed in the design of intake systems in areas of high soil erosion activities. Data was collected through interviews and physical measurements. The study revealed that flooding, intake site selection, erosion, screen clogging, intake protection, high raw water turbidity, inadequacy of raw water supplied to the water treatment plants, and low downstream environmental flows were the main intake problems. The Yanze intake had worst problems with high levels of flooding, erosion, sedimentation, and high raw water turbidity levels. The bank filtration system at Nyabarongo gave the least problems of raw water turbidity. Yanze and Nyabugogo river intakes systems were found to be threatened by decreasing water levels attributed to surrounding upstream landuse activities. It was recommended that proper maintenance of existing structures, landuse management around river intakes, use of well-designed reservoir abstraction systems, increased groundwater abstraction systems (including bank filtration), would greatly improve the performance of intake systems in Rwanda.

2020 ◽  
Author(s):  
◽  
Mpumelelo Dolo

Water is regarded as the most important substance found on earth. There is no substitute for it. The daily running of production businesses, industrial firms and agricultural production that help sustain the economy of countries are largely dependent on the availability of water for them to function. The importance of water cannot be over emphasised. The food which is consumed daily depends on water; it can therefore be safely concluded that without water there would be no food, and without food there would be no life. Despite the importance of water in relation to human life, animals and plants, research studies show that the its availability becoming increasingly deficient around the globe. Water levels of major dams and rivers around the world are dropping, limiting the supply of potable water to those dependent on them. Global warming is one factor that is influencing the dropping of water levels, through evaporation. Other factors include climate change, drought and population growth. In South Africa, the government has been fighting a continuous battle of trying to address the backlog of water infrastructure, particularly in the areas which were disadvantaged by the apartheid government. These areas include rural areas, small towns (semi-urban) and townships. The Eastern Cape province in South Africa is top of the list from a backlog point of view. Rural dwellers migrate to urban areas for various reasons such as better education, better health care, job opportunities and more efficient services. Water supply is one of the services which is more adequately supplied in the cities compared to the rural areas. Even though the supplied water in the urban areas of the Eastern Cape is not the best standard when compared to other cities around the country or the world, it is still at an acceptable standard. Thus, this study was conducted to seek ways of improving the supply of water in the urban and rural areas of the Eastern Cape. The availability and the quality of water differs between the urban and rural areas. The purpose of this study was to seek ways of bridging the gap between these areas while improving the standard of water supply in both rural and urban areas. While working towards improving the lives of the Eastern Cape people, the study also seeks to promote water preservation and awareness to the people of the province. In order to find better alternatives which have been tested in various places around the world, an in-depth literature review was conducted in the study. This functioned as an effective comparison of what is obtained in different places around the world and the context of this study, which is the Eastern Cape. A survey method was used to gather data regarding the problems surrounding water supply and options that could be adopted to remedy those problems. The survey was conducted in the form of a self-observation assessment, questionnaire for households in urban and rural areas and interview sessions with prominent government entities and local technical service providers. The survey covered the whole spectrum of individuals and groups that play a major role in the supply and usage of water. The study was conducted within three municipalities of the Eastern Cape. These municipalities cover approximately two-third of the Eastern Cape considering the size of population in those areas. The municipalities covered by the study were: Amathole District Municipality (ADM), Buffalo City Metropolitan Municipality (BCMM) and OR Tambo District Municipality (ORTDM). The findings from the study showed that indeed the standard of water supply between urban and rural areas was not equal. This relates to the purification methods, the convenience of collecting water by users, the quality of infrastructure being constructed (due to good or poor monitoring during construction) and the quality of the water as well as operation and maintenance response from the various service providers. Moreover, it was found that there was an acceptable level of awareness by citizens when it comes to using water, and precautions to save it were being taken by some. However, some dominant factors such as poor management, poor infrastructure resulting in leaks, climate change, run-offs and population growth were putting a strain on the existing water resources which is not coping with the increasing demand by people. Recommendations made in the study to balance the supply of water in rural areas and urban areas include: improving the purification of water so as to achieve a standard quality within the Eastern Cape; that rural areas be allowed to have an option of having yard or house connections, particularly those who are willing to pay rates at a scale suiting their class or standard; and that water service providers make it their responsibility to extend reticulation networks if there is expansion or development of more houses in rural areas in order to keep the distance minimal to standpipes


2019 ◽  
Vol 22 (4) ◽  
pp. 329-334
Author(s):  
Noora Saad Faraj Al-Dulaimi ◽  
Samara Saad Faraj Al-Dulaimi

Providing a clean and high quality drinking water to both rural as well as urban areas is a great challenge by itself, adding to it the large volume requirements of such water at high population areas means a very high cost for such industry because mainly of the cost of expensive commercially available adsorbent used in this process. This led inhabitants of the remote and/or rural areas to use less quality water with all its risks and health challenges. In this study, a locally collected rice husk is tested to be used as an alternative adsorbent to the expensive common commercial ones. Parameters like adsorbent dosage, initial concentration of turbidity, and pH level were tested to investigate their effects on the process. Treatment of synthetic turbid water was done after changing these parameters to measure the effect of each parameter alone and the results showed a set of parameters that can be used to achieve high efficiency of turbidity removal. The study concluded that rice husk can be used as a well cheap alternative adsorbent to reduce the river water turbidity due to its availability and low cost with a decent removal efficiency approaching 95%.


2007 ◽  
Vol 56 (4) ◽  
pp. 165-173 ◽  
Author(s):  
R.E. de Graaf ◽  
N.C. van de Giesen ◽  
F.H.M. van de Ven

Urbanization, land subsidence and sea level rise will increase vulnerability to droughts in the urbanized low-lying areas in the western part of the Netherlands. In this paper a possibility is explored to decrease vulnerability of urban areas by implementing an alternative water supply option. A four component vulnerability framework is presented that includes threshold capacity, coping capacity, recovery capacity and adaptive capacity. By using the vulnerability framework it is elaborated that current water supply strategies in the Netherlands mainly focus on increasing threshold capacity by constructing improved water storage and delivery infrastructure. A complete vulnerability decreasing strategy requires measures that include all four components. Adaptive capacity can be developed by starting experiments with new modes of water supply. A concept which is symbolically called ‘the closed city’ uses local urban rainfall as the only source of water supply. The ‘closed city’ can decrease the water dependence of urban areas on (1) the surrounding rural areas that are diminishing in size and that are increasingly under strain and (2) river water resources that will probably be less constant and reliable as a result of climate change.


2021 ◽  
Author(s):  
Yunzhao Liu ◽  
Zhongguan Jiang ◽  
Jiajun Wu ◽  
Xianfu Zhao ◽  
Jing Li ◽  
...  

Abstract In freshwater ecosystems, previous studies on microplastics have been mostly focused on natural rivers and lakes, with limited consideration of urban water source areas. Sediments, recording the steady process of microplastics accumulation during a long period of time, can act as an important sink for microplastics. In this study, we investigated the distribution, characteristics and ecological risks of microplastic contaminants in sediments of a water supply reservoir of Hefei City (the Dafangying Reservoir). Meanwhile, the differences of microplastic concentrations in sediments between the rural and urban areas were also compared. The average microplastics abundance of sediments in rural areas was 83.20 ± 32.99 n/100g dry weight (dw), and 182.67 ± 72.21 n/100g (dw) in urban areas. The total microplastic concentrations were significantly higher in sediments of urban sites than that in rural sites (p < 0.01), which can be ascribed to more complex and diverse microplastic sources triggered by intensive anthropogenic activity in cities. Specifically, we also demonstrated significantly higher microbead abundance (p < 0.01) in urban sites, which may result from the widespread use of microbead in personal care products. Our results detected five shapes (fibers, debris, films, foams and microbeads) and seven colors (white, black, transparency, red, blue, green and brown) of microplastics in sediments of the Dafangying Reservoir, with fibers and transparency accounting for the dominant shape and color, respectively. Given the complexity and diversity of microplastics in urban areas, we exhibited a relatively higher abundance of microplastics in the Dafangying Reservoir than that in other rural larger reservoirs. According to the index of geoaccumulation, the sedimentary microplastics were assessed as moderately polluted. Our study provides valuable references for microplastic contaminants in urban water supply reservoir, and highlights the importance of microplastics assessment in aquatic ecosystems.


Author(s):  
Ruchi Shree

Five-Year Plans help understand the policy and planning approach of the State to issues of water supply and sanitation in India. This chapter examines the policy focus on sanitation as reflected in various Five-Year Plans and analyses the changes that have taken place over the last six decades. At first, in urban areas, the focus is on slums whose demolition is seen as the only solution while in the later plans, there is a shift towards the creation of basic amenities. In rural areas, the Plans limit their focus to ‘problem villages’ and those suffering from endemic diseases. There is a progressive move towards decentralization, but important challenges persist in respect of how local bodies would raise the required economic resources. Towards the later Plan periods, a distinct market-based approach to water supply and sanitation emerges. Welfare measures are redesignated as economic imperatives and water is considered an economic asset.


2016 ◽  
Vol 13 (78) ◽  
pp. 123
Author(s):  
Jorge Alejandro Silva Rodríguez de San Miguel

The supply of water to rural areas has historically provided the Mexican government with a significant challenge. Years of uncertainty in relation to responsibility for water supply, as well as geographical differences across the country and a division between rural and urban areas, explain this phenomenon. I have reviewed in this paper a substantial proportion of the literature on this topic, the reasons behind its nature, and the solutions to the problem in Mexico, as my main aim. The key conclusion is that while improvements in rural water supply in Mexico have been made, further work is required for equality in its supply.


Engevista ◽  
2011 ◽  
Vol 13 (1) ◽  
Author(s):  
Anna Virginia Muniz Machado ◽  
Dario De A. Prata Filho ◽  
Ricardo Franklin P. Britto ◽  
Aline M. Naue ◽  
Carolina B. M. L. Costa

Improving the coverage of water supply and sanitation has positive impacts on economic, social and health conditions. In Brazil, the deficit in water supply and sanitation in urban areas has been reduced due to recent government investments, but are still insufficient for the service universalization. Deficiencies in water supply and sanitation are observerd in rural areas of Brazil because, historically, these areas have not received sufficient investment. This paper presents the alternatives adopted in rural communities in Brazil, with at least 2500 inhabitants, being those successful experiences that can be replicated. Research stages involved literature surveys, interviews with experts and with community representatives, and field trips. The interviews and field trips allowed the knowledge of local realities, of appropriate technical solutions, the uptake and levels of community awareness, the operational problems and the management systems frequently applied.


Author(s):  
Shane Htet Ko ◽  
Hiroshi Sakai

Abstract Myanmar is an agriculture-based country with 70% of the total population residing in rural areas. Around half of the total population in Myanmar has to consume water from unimproved sources. The prevalence of diarrhea due to contaminated drinking water is high even in urban areas. The urban community may expect the provision of municipal water supply in the near future if the current revolution in the country succeeds. However, the rural areas have lesser or no chance to get quality water because of a lot of other prioritized tasks. Household water treatment is encouraged to be implemented as one of the national water safety plans for rural water supply in Myanmar. This study explored the diarrhea prevention awareness of the rural community using a questionnaire survey. The microbial quality parameters of drinking water sources were also examined. Fecal coliform contamination was detected in all examined drinking water sources. A significant association was found between drinking untreated water and the occurrence of diarrhea. The percentage of people who applied the diarrhea preventive measures was low. Even if they knew how to prevent the disease, very few people applied the measures in reality. Therefore, measures to cause behavioral change should be initiated, together with awareness raising, to promote diarrhea prevention in the community.


2010 ◽  
Vol 62 (6) ◽  
pp. 1296-1303 ◽  
Author(s):  
S. Godfrey ◽  
P. Labhasetwar ◽  
S. Wate ◽  
B. Jimenez

Water reuse is recognized as a tool to increase water supply in peri-urban areas of semi-arid and arid regions of the world. However, it is an option rarely explored for rural areas in developing countries, and has not been documented extensively in the scientific literature. This paper presents results from 6 greywater reuse systems which were built with the objective to augment water supply and to provide sanitation in rural low income areas of Madhya Pradesh, India. The systems are based on reclaiming greywater from bathing for the use in toilet flushing and kitchen garden irrigation. The reuse systems were implemented based on the scientific rationale presented in the WHO (2006) guidelines. The paper presents evidence from the operation and evaluation of the greywater treatment plants under field conditions between 2005 and 2008. The paper concludes that greywater is a highly cost effective solution for water scarcity. In this study, reusing greywater resulted in a 60% increase in water availability, a reduction in open defecation and a fourfold increase in food availability.


2007 ◽  
Vol 46 (4II) ◽  
pp. 1137-1153 ◽  
Author(s):  
Mirajul Haq ◽  
Usman Mustafa ◽  
Iftikhar Ahmad

Drinking water is the basic need of human life. Safe drinking water is an essential component of primary health care and have vital role in poverty alleviation. There is positive correlation between increased national income and the proportion of population with access to improved water supply. An increase of 0.3 percent investment in household access to safe drinking water generates one percent increase in GDP. Whereas, provision of safe drinking water supply is an effective health intervention reduces the mortality caused by water-borne diseases by an average 70 percent. Inadequate drinking water not only resulted in more sickness and deaths, but also augments health costs, lower worker productivity and school enrolment [World Bank (1994)]. The World Health Organisation (WHO) estimate 1.8 million people in developing countries die every year from diarrhea and cholera, Out of these 90 percent are children under the age of five years. While 88 percent of diarrhoeal diseases are attributed to unsafe water supply, inadequate sanitation and hygiene [WHO (2004)]. The situation is not very different in Pakistan; the access to safe drinking water is estimated to be available to 23.5 percent of population in rural areas and 30 percent in urban areas. While every year 0.2 million children die due to diarrhoeal diseases [Rosemann (2005)].


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