20 November 2012, 16:58
Not quite sure of what you mean, but I'm thinking SW are looking for acrages of land they will allow flood water to inundate upstream of a flood prone town. Basically they are looking for land they can divert the flood water to and hold it till the river level drops before releasing it gradually.
They drill to check see the thickness and at what depth either the bedrock is or a clay layer.
They drill to check see the thickness and at what depth either the bedrock is or a clay layer.