Above ground where digging is hard
Excavating on the Fens often means pumping out groundwater as fast as the hole fills. A steel tank sidesteps the problem by standing on a slab with its whole depth above ground, where it is easy to inspect, drain and keep clear of whatever is in the soil around it.
Common uses here include irrigation stores for vegetable and salad crops, wash water for root crops at packhouses, rainwater collected from glasshouse roofs, and process or recycled water on industrial estates around Peterborough, Huntingdon and Cambridge.

