We attend homes and businesses across Christchurch with rapid callout availability and clear fixed pricing.
Christchurch occupies one of the most hydrologically complex positions on the south coast: the town sits at the confluence of the Rivers Avon and Stour, with Christchurch Harbour to the east and Stanpit Marsh—a nationally important wetland—along the northern harbour shore. The Avon flows south from Salisbury through the New Forest, while the Stour arrives from the Dorset interior via Wimborne and Bournemouth, and both rivers converge just upstream of the Priory before reaching the harbour. This means Christchurch is essentially an island of higher ground in a floodplain, and the flood risk across the town centre and riverside areas is both real and well-documented.
The Environment Agency maps large parts of Christchurch within Flood Zones 2 and 3, particularly in the historic town centre, along the River Avon corridor through Wick, and in lower-lying parts of Purewell and Somerford. Properties in these zones are at genuine risk during major flood events and face a permanently elevated water table, especially in the months from October to March. The drainage consequences are significant: clay pipes in the older streets around the Priory and Bargates are routinely subject to groundwater ingress through cracked joints, and the combined sewer network serving the town centre struggles during flood events as both surface water and groundwater overwhelm its capacity.
Highcliffe and Friars Cliff, on the coastal strip to the east, present a different set of challenges. Here, the geology transitions to sandy cliffs and coastal plain—similar to neighbouring Bournemouth—with a higher risk of cliff erosion and ground movement affecting buried infrastructure. Coastal properties at Friars Cliff and along the Avon Beach frontage sit on marine sand and gravel above a saline water table. The marine environment accelerates corrosion of older metallic pipe fittings and creates specific challenges for any below-ground drainage repair.
The Avon Valley floodplain at Wick and the broader Stour floodplain around Somerford and Jumpers contain both older residential properties and more recent development. New development in these areas is required by planning conditions to incorporate SuDS, but older properties may have drainage layouts designed without consideration of the floodplain context. Our engineers have detailed knowledge of Christchurch's varied geography—from the historic riverside town centre to the coastal strip at Highcliffe—and provide drainage assessments that account for the specific flood risk and ground conditions of each area.
Scheduled CCTV survey for new owners of a riverside property on Wick Lane, purchased without a prior drainage survey: inspection revealed that the previous owners had extended the property and re-routed the main drain run, but the new routing had been poorly backfilled, leaving a 20cm sag in the pipe where solids were accumulating. A second defect—an open joint allowing harbour-area groundwater to enter the system—was also identified. We relined the sagging section using a cured-in-place structural liner and patch-lined the open joint, restoring correct gradient and preventing groundwater infiltration. The new owners appreciated having a complete drainage survey report before committing to further renovation work.
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Properties along the River Avon and Stour corridors, including parts of Wick, Purewell, and the town centre, should fit non-return (reflux) valves on their outgoing drains as a standard precaution. These prevent sewage from backing up into the property when the public sewer surcharges during flood events. Regular jetting and CCTV inspection also help ensure your private drain is in the best possible condition to handle high-water-table conditions.
The sandy coastal cliffs at Highcliffe and Friars Cliff are subject to ongoing erosion, and any drainage defect in this geology allows water to migrate through loose sandy soils—potentially accelerating ground instability. We recommend CCTV surveys for cliff-top properties that haven't been inspected recently, and prompt repair of any identified defects to protect both your drainage system and the ground stability around your property.
Properties adjacent to Stanpit Marsh and the upper harbour shore are on very low-lying ground with a permanently high water table. This makes them vulnerable to groundwater infiltration into drainage systems throughout the year, not just during flood events. If you have a property in the Stanpit or Mudeford area and experience recurrent drainage problems, a CCTV survey is likely to reveal groundwater infiltration as a contributing factor.