Penstock through tunnel
The upper part of the penstock towards the Builai spring and dam will pass a steep area, exposed for erosion and land slide.
Photo: Basil Rolandsen (www.bouvet.info)
To avoid disturbance of the soil, a tunnel is under construction through the exposed area, around 20 meter long and at certain areas around 6 meter below the surface! For security reasons for the workers, and as foundation for the penstock, a steel culvert is all the time pressed into the tunnel as the work is progressing. This is pioneer work in Timor-Leste.