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Daily
Stream
flow
discharge
[m 3 /s]
Suspended
sediment
concentrations
[mg/l]
Gauge
Height
[m]
Sediment
load,
[t/day]
Statistic
No.
102
70
13
70
Max
5067
213
3.250
20,707
Min
5.0
2.0
0.250
13.0
Mean
981.0
19.925
1.813
2,615
Standard Deviation, STD
1108.6
29.240
1.051
4,325
Coefficient of Variation, Cv (%)
113
146.748
57.949
165
Standard Error of the Mean,
SEM 109.8 3.495 0.291 517
Table 2b-2. A summary of intermittent daily sediment flow data for the Simiyu River
catchment as sampled between June 30, 1999 and May 29, 2004 at the Main Bridge site, the
outlet
No. of
stations
Data
availability
%
missing
Resolution
SN
Data type
Source
Spatial Temporal
Rainfall
3
1990-2004
0.12-
0.24
NMSA
-
Daily/ho
urly
1.
Climate
4
1990-2004
1.32-
1.42
NMSA
-
Daily
2.
Flows
3
1990-2004
0.15-
0.27
DH-MoWR
-
Daily
3.
DEM
2008
-
USGS/
HDRO 1K
1 km
-
4.
5.
Landuse
2008
-
GLCC
1 km
-
Soil
2008
-
FAO/SOTE
RSAF
10 km
-
6.
Sediment
load
3
1990-2004
2.2-2.8
DH-MoWR
-
Daily
intermitte
nt
7.
Reservoir
bed
contour
1959, 1981,
1988, 1999
-
DH-MoWR
-
22, 7, 11
years,
respective
ly
8.
Table 2c-1. Data types and sources for the Koka Reservoir catchment
Note: DH-MoWR: Department of Hydrology, Ministry of Water Resources, Ethiopia;
NMSA: National Meteorological Service Agency, Ethiopia; and “-“ Not applicable.
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