impacts of swc interventions and land use on discharge and sediment yield at plot and watershed...
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Africa RISING in the Ethiopian Highlands
Objective: Evaluating the impacts of SWC interventions at different scales.
Research methodologies • Hydrological bounded runoff plots used to evaluate at plot scale (Fig. 2).• Gauge hydrological stations were used to evaluate at watershed scale (Fig. 2).
Impacts of SWC interventions and land use on discharge and sediment yield at plot and watershed scale
Tesfaye Yaekob, Lulseged Tamene, Solomon Gebreyohanes, Solomon Seyoum, Kindu Mekonnen, Zenebe Adimassu, Kifle Woldearegay
Fig. 2. Runoff Plot and Hydrological Station
0
50
100
150
200
250
300
350
Faba Beanwithout SWC
Faba Beanwith SWC
Eucalyptuswoodlot with
SWC
Grazing land Mean
231
130 123
345
207
Me
an r
un
off
(m
m)
4.72
2.28
0.21
2.68 2.47
0.00
0.50
1.00
1.50
2.00
2.50
0.000.501.001.502.002.503.003.504.004.505.00
Faba Beanwithout SWC
Faba Beanwith SWC
Eucalyptuswoodlot with
SWC
Grazing land Mean
Ave
rage
Se
dim
en
t C
on
c.(S
SC)(
g lt
-
1)
Me
an S
oil
Loss
(to
n/h
a)
Soil Loss Average SSC (g lt-1)
Results• Plot-and catchment-level experiments showed significate differences in runoff and
sediment yield between treatments and land use/cover types (Fig. 3 , 4 and Table 1).
• Terraces with trenches on cropland reduced runoff and soil loss by 44% and 52%,respectively.
• At the catchment scale, discharge reduced by over 40% for the sub-watershed with SWCpractices.
• Sediment yield at catchment scale reduced by 70% due to SWC and water harvestingmeasures.
The SWC mobilization program achieved the intended target to reduce soil erosion and increase retention capacity of the watersheds. Integrating physical measures with biological options and supplementing these with water
harvesting structures can promote their adoption.
Conclusion
Fig.1. Gully and Sediment load at Gudoberet Kebele
Parameters Watersheds
With SWC Without SWC
Area (Ha) 33.83 22.08
Rainfall (mm) 737.60 737.60
Discharge (m3/watershed) 134682.40 105933.00
Discharge (m3/ha) 3981.15 4797.69
Sediment Yield (ton/watershed) 31.03 102.05
Sediment Yield (ton/ha) 0.92 4.62
Table 1. Sediment and discharge summary data
Fig. 3. Runoff estimated for different land use and management types
Fig. 4. Effects of land use and management on soil loss
Core partners
This poster is copyrighted by the International Livestock Research Institute (ILRI). It is licensed for use under the Creative Commons Attribution 4.0 International Licence. November 2016
We thank farmers and local partners in Africa RISING sites for their support
Soil erosion is a serious problem for agricultural production in Ethiopia (Fig. 1). To tackle it, communities are engaged in various soiland water conservation (SWC) and water harvesting practices.