Abstract:
The overall objective of the research was to evaluate
the influence of low impact developments (LIDs) on the
generated runoff in Eldoret town, Kenya. The specific LIDs
investigated were the infiltration trenches and bio-retention
ponds. On methodology, rainfall was measured using rain gauge
while discharge was measured using the current meter.
Simulation was done using Storm Water Management Model
(SWMM) version 5. The results indicated a reduction of average
runoff flow by 25% when infiltration trenches were used to an
extent of 100% treatment of impervious area and a reduction in
total runoff volume by 19.6%. In addition, bio-retention ponds
reduced average runoff flow and volume by 1.6% and 4.4%,
respectively. Therefore it was concluded that bio-retention cells
and infiltration trenches have an effect of reducing flow and total
volume in the study area and can be used to control flooding.
Further study is recommended on effect of permeable pavements.
