Passive Rainwater Harvesting Structure for Stormwater Management and Green Areas Improvement of Institutional Plots in Urban Areas: The case of EiABC Campus
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Date
2018-11
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Addis Ababa university
Abstract
Stormwater runoff is the major challenge in urban areas due to the increase in
impervious surfaces, higher rate of urbanization and rapid economic growth. EiABC
campus is, among institutional plots in Addis Ababa, recently has been transformed
into more impervious surfaces characterized by 46% of surfaces developed as
buildings, roads, parking lots and pedestrian walkways. The stormwater runoff
generated from these impervious surfaces transported into municipal drains and
roadway without any interventions that are found to result in chronic impairment of
surface water quantity and quality. The objective of this study is to investigate the
opportunity of the passive rainwater harvesting system from the impervious ground
surfaces of institutional plots in urban areas for its stormwater management and green
area improvement.
The GIS and remote sensing were used to produce a suitability map for selecting the
ideal location for the placement of water harvesting structures in the EiABC campus.
The Bio-retention system was selected among the others Best Management Practices
and eventually developed at the selected site within the compound. The quantity of
stormwater was estimated by a rational method and the quality parameters were
collected on site and processed in the laboratory. The study estimated that 620.4m3 of
surface runoff was harvested through Bio-retention system from 4122m2 drains area.
The Bio-retention average removal rates for pollutants of TSS, TDS and Turbidity were
76.92%, 59.2%, and 45.67% respectively. This indicated that the quantity and quality
of stormwater were managed through the development of simple rainwater harvesting
structure as a Bio-retention system
Description
The thesis is submitted to Ethiopian Institute of Architecture, Building Construction
and City Development /EiABC/ and to school of graduate studies of Addis Ababa
University in the partial fulfilment of the requirements for the degree of Master of
Science in Urban Design and Development
Keywords
Runoff, Bio-retention, Stormwater quality, Stormwater quantity