Drainage on Chalk and Clay: Solutions for Petersfield
2 min readPetersfieldBy AA Drainage
Petersfield sits where chalk downland meets clay and sand. Ground conditions can change from one side of a village to the other, which affects every drainage design.
Why the ground matters
Chalk and greensand often drain well, making soakaways effective. Clay drains slowly and needs larger systems or a different approach.
What we check
Before designing, we look at:
- Percolation test results
- Groundwater levels and springs
- Slopes and where water naturally flows
- Space available on the plot
Matching the solution to the site
That might mean a crate soakaway on free-draining ground, land drains with an outfall on clay, or attenuation with a controlled discharge where neither works well.
Frequently asked questions
Can chalk cause problems?
Occasionally chalk has voids or solution features, so soakaways need careful siting.
Do you cover the whole Petersfield area?
Yes, including surrounding villages.