Drainage Services Across Caerphilly

Caerphilly county borough covers the Rhymney and Sirhowy valleys — Bargoed, Blackwood, Risca, Ystrad Mynach — and the flatter land around Caerphilly town itself. Terraced colliery housing dominates, with drainage installed in the late nineteenth and early twentieth centuries.

Rear-access lanes behind these terraces typically carry shared private drains serving many properties, often in salt-glazed clay and laid at shallow depth. Decades of subsidence over worked coal measures have opened joints and created dips, and blockages in one length affect every house on the run. Steep catchments mean stormwater arrives fast and combined sewers surcharge; ochre from mine water and heavy silt loads scale and narrow pipes over time. Modern estates on reclaimed colliery land have better pipe material but sit on made ground that continues to consolidate.

Shared runs need identifying properly before work starts, so we survey the whole length, clear it, and reline the sections that ground movement has damaged rather than repeatedly re-jetting the same fault.