The Mountains of Malswick. What have we done, and WHY?

Many people driving between Gloucester and Newent have noticed the large heaps of rubble and clay which have been deposited at our Malswick site.  

They are strictly temporary, and will be moved this Summer.  But why have we done this?  What is it for?

This video provides some answers.  

Music from YouTube audio library.  Sunshine, by the Mini Vandals.