The technology is applied in areas under the 'Working for Water' projects that are run by the National Department of Water Affairs in South Africa, in the fight to combat invaders exhausting our valuable water resources. Catchment areas are fields that are infected by invader species on riverbanks, and catchment areas that extract enormous amounts of water out of the system. The trees (Black wattle - Acacia meansii) are cut or ring barked. After the trees are felled, large areas of bare ground are exposed. In order to prevent soil erosion until the natural succession processes are completed and the area is in equilibrium with the rest of the environment, soil needs to be stabilised and sometimes also rehabilitated.
These exposed areas must first be treated with a follow-up to prevent the coppice, re-growth and seedlings from growing again. Sometimes in agricultural grazing areas, the bare areas are re-seeded with natural climax grasses, and in urban areas left to be stabilised by successional species, or pioneers and aveads etc. The small branches of the felled trees are packed on bare areas, after the re-seeding to stop the topsoil from eroding. This reduces the off-flow and flow speed of the rainwater, lowering the raindrop impact, increasing the moist regime and preventing wind erosion. The thick stumps are either used for firewood or for the charcoal industry, as well as packed in windrows horizontal with stream flow.
Lieu: Gauteng, Gauteng, Afrique du Sud
Nbr de sites de la Technologie analysés:
Diffusion de la Technologie: répartie uniformément sur une zone (2.0 km²)
Dans des zones protégées en permanence ?:
Date de mise en oeuvre: il y a moins de 10 ans (récemment)
Type d'introduction
| Spécifiez les intrants | Unité | Quantité | Coûts par unité (Rand) | Coût total par intrant (Rand) | % des coût supporté par les exploitants des terres |
| Main d'œuvre | |||||
| Cutting of trees and packing branches | persons/day/ha | 500,0 | 30,0 | 15000,0 | 100,0 |
| Equipements | |||||
| tools | ha | 1,0 | 500,0 | 500,0 | 100,0 |
| Matériel végétal | |||||
| Seeds | ha | 1,0 | 125000,0 | 125000,0 | 100,0 |
| Coût total de mise en place de la Technologie | 140'500.0 | ||||
| Coût total de mise en place de la Technologie en dollars américains (USD) | 23'416.67 | ||||
Where reseeding was done the bare soil will be replaced with grasses
Where reseeding was done the bare soil will be replaced with grasses
Better grazing for cattle and selling of fire wood
Selling of wood for fire wood & charcoal to charcoal industry
Training and job creation
Better technologies and experience
Quantité avant la GDT: 90
Quantité après la GDT: 30
No Wattle's to extract water, reduced runoff
Soil is stabilized
