Flood Damage Analysis, For Teji Area/Illu Woreda
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Date
2020-09
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Flooding is one of the most common, wide-reaching, and destructive natural perils,
affecting, on average, approximately 250 million people around the world each year. It is
also common in Ethiopia during the rainy season between June and September. Most of
the flood disasters in Oromia are associated with rivers that overflow and burst their banks
succeeding heavy rains and inundated lowlands. Flooding of the upper basin and
tributaries of Awash River affected 14 peasant’s associations (Pas) in Illu, Sebeta Awas,
and Ejere woredas of southwest Shewa zone. The flood was reported to have affected a
total of 14,790 people out of which 2,052 people were displaced and inundate along the
river banks in lowland plains. The objective of the study is to quantify and estimate the
damage of flooding on the economy in the Illu Woreda Teji Area using the HEC-FDA
model. Adopting HEC-GeoHMS Arc-GIS extension physical characteristics of a
catchment is obtained from the study area digital elevation model. Using the study area
rainfall/meteorological data/ HEC-HMS model computes peak flow for different return
periods near the outlet of the river catchment. Flood plain mapping near the Teji River was
generated depend on the peak flow of the river for different return periods by the HECRAS
model,
Arc-GIS to
the
special
data
processing
as
well
as
HEC-GeoRAS
to
link
ArcGIS
with
HEC-RAS.
Depending
on
the
HEC-RAS
result
hydraulic
model,
applying
the
HEC-FDA
model,
numerically
flood
damages
are
estimated.
The
flood
plain
area
across
Teji
River
generated
for
2, 5, 10, 25, 50, 100,
200
as
well
as
500
return
periods
were
308,
422,
459,
507,
535,
574,
598
as
well
as
622
ha
consecutively.
In
the
end,
flood
damage
costs
were
estimated
by
the
HEC-FDA
model.
From
the
study,
the
main
output
is
expected
annual
damage
(EAD).
That
is
EAD
is
estimated
to
be
2,962,832.59$(Two
Million
Nine
Hundred
Sixty-Two Thousand Eight Hundred Thirty-Two Point Five Nine Dollar).
Additionally using HEC-FDA model by assigning a levee the economic damage is reduced
to 403.43$, and levee is proposed for flood plain management.
Description
Keywords
Flood Damage, Teji River, HEC-HMS HEC-RAS, HEC-GEORAS, HECFDA, EAD