MITIGATING FLOOD RISK BY USE OF GIS IN PARTS OF NAIROBI

Abstract
In the last few years, many incidences of floods have occurred in different regions of Kenya.
These floods have caused serious damages, loss of human lives and huge economic losses in the
affected areas.
This project covers Mathare, Pangani and Muthaiga in Nairobi. These are some of the areas that
have in the recent times experienced floods. Geographical information system is the main tool
used in the current flood forecasting technology. G.I.S can further be used to enhance these
technologies to better inform the public and the relevant stakeholders with an accurate
warning system to reduce the expected impacts of the floods and ensure the safety of the
people in the flood prone areas.
Geographical Information Systems can provide information that has proved useful for a wide
range of applications in disaster management (Banger S.K, 1998). The application of G.I.S.
techniques for real time flood mapping and monitoring is an important tool of information for
decision makers. This paper discusses the application of G.I.S in the management of floods. A
methodology on how data were obtained was discussed and with the use of G.I.S application,
potential flooding maps of Mathare, Muthaiga, and Pangani were demonstrated. From the data
and the maps obtained, the result showed that parts of the areas were prone to floods. The
DEM map showed that the relative steep slope increases runoff as many paved sections in the
area of interest decreased infiltration. In conclusion, due to the availability of pavements,
structures such as residential, commercial and industries which are coupled with poor drainage
systems, promotion of urban floods are likely to emerge. My study therefore recommended a
GIS based flood management practice based on its advantages, among them being able to
integrate an early warning system with its modeling capabilities to well handle floods.

 

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