OVERVIEW
It was proposed to erect a 4MW solar farm consisting of solar panels, power invertor stations, transformer stations, sub-station, security fencing with associated access gates and CCTV security cameras at land to the west of Potbridge Farm, Hook, RG29 1JN.
Premier Water Solutions Ltd (PWS) was contracted to review the existing information, undertake a site visit to include percolation testing, technical calculations, drawings and report sufficient information for review by the Local Authority and Environment Agency. PWS was also appointed to prepare a flood risk assessment to accompany the planning application to satisfy and comply with the National Planning Policy Framework (2012).
PROPOSAL
To erect a large number of solar panels on the field. There will be several inverter and transformer buildings within the site together with a separate substation.
Water would be drained via downpipes and allowed to sheet off and infiltrate into the surrounding ground. A low maintenance swale would collect any sheet flow from the surface water draining off the panels onto the ground.
CONCLUSIONS
A hydrological and surface water assessment was provided.
The site is located within a flood zone one with a low probability of flooding.
The proposed development is classified as being less vulnerable.
There was no elevated risk of erosion from the surface water as it travels towards the swale, providing that all of the area remains grassed.
The swales would divert runoff to the nearest existing drainage ditch in the corresponding field.
The final drainage scheme to direct rainfall runoff to the ground with a swale located after every third row of panels.
Buildings and concrete plinths to drain onto the adjacent ground which will be protected.
The constructed access road to require further design to consider the infiltration and structural capabilities of the road.
Maintenance plan produced.
A construction quality control plan was produced that suggested:
