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International Institute for Aerospace Survey and Earth Sciences, Netherlands (2004)

Environmental impact of urban storm runoff and sewage from Naivasha town on Lake Naivasha

Arindita, Dessi Permatasari

Titre : Environmental impact of urban storm runoff and sewage from Naivasha town on Lake Naivasha

Auteur : Arindita, Dessi Permatasari

Etablissement de soutenance : International Institute for Aerospace Survey and Earth Sciences, Netherlands

Grade : Master of Science (MSc) 2004

Résumé
Population growth urged people to spread out in order to live a better life. Town, representing the central focal point of human activity, is an interesting place to study. It represents a great concentration of resources consumers and waste producers. This urbanization process gives a lot of effects to the environment surrounding the town, especially the stream or lake near the town. As the town growing, the water supply demand, urban pollution and waste problem of Naivasha town are increasing. The activities of Naivasha town give an effect to Lake Naivasha, which is the second largest freshwater lake in Kenya. The main pollutant sources of Naivasha town to the lake come from runoff and sewage. The main objective of this study is to assess the water quality as the impact of urban storm runoff and sewage from Naivasha town, in order to estimate the contribution of Naivasha town activities to the water quality of the lake. This main objective was achieved in a first phase by analyzing water quality of drinking water, runoff water and sewage water. Then the classification of paved an unpaved area was done because the urban runoff problem has a relation with the paved area. This area collects and quickly runs off. This classification process was done using eCognition. The result of water quality analysis and the classified paved-unpaved area involved in the estimation of pollutant loads of storm water runoff using the Simple Method. To estimate the sewage pollutant loads, a calculation of the discharge of the sewage and concentration of each pollutant was done. Two scenarios were created to predict the pollutant loads. These two scenarios used different assumptions to compare the effect of a change in variables, which is important in a pollutant loads future pre-diction. In this case, those variables are population growth and increasing of the paved area. The first scenario was created based on the changes of population growth without any changes on area development. The second scenario was created using population growth along with increasing of the paved area. From these two scenarios, the pollutant loads of Naivasha town for 10-years projection were calculated. In general, a continuous monitoring of water quality to control the pollutants of the town and the accumulation of the pollutant at the lake is proposed for the Naivasha Municipality. Keywords : Environmental Impact, Water Quality, Storm Runoff, Sewage

Sujets : Lake Naivasha, Kenya ; Naivasha, Kenya ; Pollution ; Sewage disposal ; Stormwater ; Environmental impact ;

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Page publiée le 21 janvier 2017, mise à jour le 14 novembre 2019