Large dimension soil faced deep trench bunds in grazing land (Eyasu Yazew (Mekelle University, P.O.Box 231, Mekelle, Ethiopia))
Soil faced deep trench bund is constructed by excavating trenches of 1 m deep, 0.5 - 1 m wide and 2 - 3.5 m long with spacing between trenches of 0.3 - 0.5 m along the contour and using the excavated soil to construct a compacted bund downslope. The smaller dimensions are usually used in cultivated lands while the larger are implemented in grazing lands.
Purpose of the Technology: Soil faced deep trench bund decreases slope length, runoff velocity and soil loss; and increases runoff harvesting, soil moisture and groundwater recharge.
Establishment / maintenance activities and inputs: Construction of soil faced deep trench bund involves alignment of a contour, excavation of trenches, construction and compaction of bund and planting grass, while the maintenance involves dredging of sediment from the trenches and use it for reinforcing the embankment.
Line level, tape meter, digging hoe, shovel and grass are needed for the establishment and maintenance.
Natural / human environment: The technology is implemented in moderate (5 - 8%) and hill (8 - 16%) slopes and in medium and heavy soil types of at least 1 m depth. It reduces runoff amount and velocity thereby decreasing soil loss and desertification/land degradation. It also improves soil moisture availability and groundwater recharge by encouraging lateral and vertical movement of water respectively.
It is mostly constructed using communal labour and there is an encouraging trend of spontaneous adoption. The technology is witnessed to be increasing crop and fodder production thereby improving the livelihood of the land users. It, however, is labour intensive and slightly reduces farm size.
Lieu: Kilte Awlaelo, Tigray, Ethiopie
Nbr de sites de la Technologie analysés:
Diffusion de la Technologie: répartie uniformément sur une zone (approx. 10-100 km2)
Dans des zones protégées en permanence ?:
Date de mise en oeuvre:
Type d'introduction
| Spécifiez les intrants | Unité | Quantité | Coûts par unité (Birr) | Coût total par intrant (Birr) | % des coût supporté par les exploitants des terres |
| Main d'œuvre | |||||
| Labour | ha | 1,0 | 2119,0 | 2119,0 | 60,0 |
| Equipements | |||||
| Tools | ha | 1,0 | 44,0 | 44,0 | |
| Matériel végétal | |||||
| Seedlings | ha | 1,0 | 36,0 | 36,0 | |
| Coût total de mise en place de la Technologie | 2'199.0 | ||||
| Coût total de mise en place de la Technologie en dollars américains (USD) | 122.17 | ||||
| Spécifiez les intrants | Unité | Quantité | Coûts par unité (Birr) | Coût total par intrant (Birr) | % des coût supporté par les exploitants des terres |
| Main d'œuvre | |||||
| Labour | ha | 1,0 | 833,0 | 833,0 | 100,0 |
| Coût total d'entretien de la Technologie | 833.0 | ||||
| Coût total d'entretien de la Technologie en dollars américains (USD) | 46.28 | ||||
Increased investment in health as a result of increased income.
