Infiltration with Rock Permeability Coefficients for Subgrade Design

Flood is still one of the disasters of concern, because it has a destructive force that is quite disturbing, even causing losses and endangering safety. The majority of floods are dominated by water which is an accumulation of surface runoff, so to control it, efforts must be focused on how to maximize the infiltration of rainwater into the ground. The majority of land owners in the catchment area, which are generally referred to as watersheds (DAS), are the community. Therefore, efforts to control it must involve the community. A simple construction that is quite effective to use is an infiltration well, because it has a large enough capacity but is easily made by the community, with a relatively small risk. However, from a review of the drainage system, the use of infiltration wells requires a higher cost than the construction of drainage channels to drain rain into rivers. Therefore we need design optimization efforts to get the cheapest cost. The design will be appropriate if accurate data is used, therefore testing the permeability coefficient of the subsurface rocks.