Brockhurst Gate Retail Park, Gosport - light case study

Where

The site was a former Naval exercise ground in front of Brockhurst Castle, known as the fire grounds due to the direction the cannons pointed. Later a number of ‘tank blocks’ had been deposited during the WWII to protect the castle. The soil is of clayey variety with little to no infiltration which was not how the drainage strategy was first sold to the Client.

Two flow control manholes have been designed that have weir walls such that during storm events typically in excess of 1:10yr occurrence, water overspills into the swales which are linked underneath a walkway through the middle. The flow control manhole at the discharge end prior to it connecting to the Public Sewer ensures that only the Greenfield rate of discharge is passed on to the sewerage network