Drainage Services in Emsworth

Emsworth sits at the head of Chichester Harbour, and the tide is central to how its drainage behaves. The quay, the mill ponds and the low streets close to the water lie only a little above high water, so gravity outfalls are restricted at high tide and slow drainage or gully surcharge tends to follow the tidal cycle rather than any internal blockage.

Behind the waterfront the ground is alluvium and clay over coastal plain gravels with a permanently shallow water table, so open joints in the older clay pipework admit groundwater and fine sediment continuously through the wet months. The historic centre has shallow Victorian drainage, some combined, beneath narrow streets and listed frontages where excavation is restricted. Inland at Southbourne, Westbourne and Hermitage the housing is more recent, with clay-to-plastic separated systems on flat ground where shallow gradients allow debris to settle. Discharges here run into a protected harbour environment, so standards for any off-mains system are strict.

For Emsworth we CCTV survey first to separate tide-locking, groundwater infiltration and blockage. Jetting clears silt from the flat runs near the harbour, sealing and no-dig lining stop infiltration and repair fractured pipework without digging up historic frontages, and where surcharge is tidal we assess non-return valves and pumped drainage.