KITUI SAND DAMS

CONSTRUCTION.Setting the trench.This is marking the position and the size of the dam. It is done by pegging the dimensionsof the dam taking in to account the size of the wing wall and working space duringconstruction. Several factors are considered in this process.When determining the distance the wing walls go into the banks, bank characteristics aretaken into account. In loose riverbanks, the distance should be about seven meters from theriverbank. Hard soils about five meters. Hard and impermeable, can be zero. No need of backflow in case of a rock formation downstream of the dam.Trenching Procedure.Measure the appropriate distance from on one of the river banks depending onbank characteristics and fix a peg at the distance.Fix another peg across the river perpendicular to the river course at theappropriate distance.Building line.Peg 1River coursePeg 2Using a plumb bob and line mark several points from the building line and fixpegs.43