Design of storm water drainage for an estate at epe in Lagos state, Nigeria

Oyegoke, SO and Adebanjo, AS (2018) Design of storm water drainage for an estate at epe in Lagos state, Nigeria. International Journal of Hydrology.

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Abstract

The research was intended to design facilities to manage storm water for a new estate, and the scope is to determine the possible flood extent using the rational method and then provide the flows that each sewer is required to be designed to carry in order to properly drain the estate in the event of rainfall storm. The estate is located on 20 hectares of land along Lekki Express Freeway between Lagos and Epe. There’s a bridge located to the north of the estate that drains the estate and the adjourning regions. The site is generally well drained, draining from South to North and East to West. The estate is a sub-catchment of a bigger catchment area that drains partly as a river that flows into the estate through its western boundary on its way to the bridge outlet to the north western section of the estate. The total catchment area contributing to flow within the estate amounts to 214335.80m2 while the total catchment area contributing to flows within the estate and those flowing through the estate to the bridge and towards the north of the estate amount to 234955.80m2. Gumbel Extreme Value Distribution was used to determine the Intensity Duration Frequency (IDF) was gotten and the rainfall intensities for the shortest duration (15minutes) for various return periods of 5, 10, 50, and 100 years were gotten and flow then determined that will feed each sewer produced on the site. The flood levels on the estate fence and at the adjacent bridge were also determined for 30-year Return Period through interpolation on the IDF curve to be 4.85m and 5.340m with the bench mark being 3.39m taken from the bridge.

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