CASE STUDY
Project team cuts CSO storage option selection from weeks to half a day
SECTOR: WATER
LOCATION: UK
OVERVIEW
Rapid CSO optioneering across a large catchment
A leading UK water company was tasked with an ambitious engineering programme to install 700 new CSO storage tanks across their catchment in 3-6 months as part of a wider target to reduce spills by 40% over active storm overflow sites. The challenge was not designing the storage solution. It was instead deciding where CSO storage tanks should go, quickly and with confidence, across hundreds of possible CSO sites. The engineering, operations, and delivery teams used Sensat to bring all site information into one shared view, alongside simple models of the storage solutions, allowing them to rule out unviable locations early, reduce site visits, and expediting their delivery programme from weeks of option selection to only a few hours per location.
THE PROBLEM

Early-stage optioneering had become a major bottleneck.

To identify suitable locations for CSO tanks, teams needed to consider:

  • Geology and ground conditions
  • Topography and constraints
  • Existing assets and utilities
  • Prior studies and survey data

The information existed, but it lived across different systems, files and teams. With no shared view, feasibility could only be judged one site at a time. Specialists spent time assessing locations that were later ruled out, site visits were booked before basic viability was clear, and cross-functional teams couldn't get a clear view of feasibility early.

Confirming even basic constraints meant pulling data together by hand and visiting sites multiple times - often just to establish why a location wouldn't work at all.

Against a strict 700 tank target, a process this slow and manual, put the delivery timeline at risk.

"
“We were spending weeks just narrowing down options before we could confidently move forward.”
PM at water utility company
THE SOLUTION

One shared view for early option selection

The teams used Sensat to visualise large areas of the catchment in a single, shared view.

They brought together:

  • Geology and ground investigation data
  • Topography and environmental constraints
  • Existing assets and underground utilities
  • Different sizes and locations on site for the storage solutions

This allowed PMs and specialists to assess multiple potential sites from their desks and compare options side by side.

The result
Faster option filtering
PMs and specialists could quickly see which locations were viable and which were not, before committing time or resources.
Fewer site visits
By reviewing up to 30 km² in one view, teams only visited sites that had already passed basic feasibility checks.
Rapid feasibility checks
Teams could sketch, move, and test basic option shapes against real constraints, speeding up early decisions.
Better use of specialist time
Engineers and ground teams spent less time exploring dead ends and more time progressing viable solutions.
Why this mattered

For the Operations and Engineering teams, Sensat was not about producing a better visual. It was about removing friction early, to hit the ambitious target: 700 storage tanks, sited and delivered in 3-6 months. The old way of working wouldn’t be able to meet that. 

By speeding it up, the team delivered to schedule, cut wasted effort and put resources where they had the most impact.

Where this approach works best
  • Siting new storage or assets across many candidate locations
  • Early-stage optioneering and feasibility
  • Catchment-wide planning exercises
  • Projects where site visits are costly or slow to arrange
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