Quantity surveying and claims support for drainage networks, attenuation, outfalls and flood-protection construction.
Drainage and flood-protection schemes can combine pipework, channels, storage features, structures and earthworks. Below-ground construction needs to connect with levels, outfalls and surface works across the site. Quantities and package interfaces need to remain clear where drainage is delivered alongside a wider development or existing assets.
A different outfall level can change the depth of an entire drainage run, not just the connection at its end.
We compare survey findings and technical instructions with the priced design. The valuation follows the whole affected run, separating additional quantities and temporary measures from allowances already included.
Drainage and flood works may need bypass pumping, temporary channels or protection while the permanent system is incomplete. A changed flow or sequence can extend equipment hire and attendance.
We check the bypass or temporary-flow arrangement included at tender, including its expected duration. Actual flow, plant and instruction records help establish why it remained longer or had to change. A hire invoice proves an expense was incurred; it does not, on its own, show that the other party is responsible for it.
Material available on site may not satisfy the engineer's requirements for an embankment. Planned reuse can become a combination of disposal and imported fill, with a very different haulage and testing cost.
We reconcile the accepted and rejected material with surveys and movements, checking treatment and transport against the excavation and fill rates.
River and floodplain construction may be constrained by agreed ecological periods, land access and weather exposure. A delayed start can move activities into a more restrictive period and change the delivery method.
We identify the actual access or ecological restriction and trace its effect on the affected activities. A seasonal premium needs a demonstrated change in method, attendance or mobilisation behind it.
