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Keadby Pumping Station is the outfall for the River Torne within the Isle of Axholme to the Tidal River Trent. It comprises six gravity sluices which maintains water levels within the Isle of Axholme and discharges fluvial flow to the Tidal River Trent when tide levels permit. High flows are pumped via six pumps, providing approximately 32m3/s discharge capacity when required.

  • Software run with Flood Cloud: Flood Modeller and TUFLOW

  • Time to run 100 simulations with normal approach: 1,680 hours

  • Time to run 100 simulations with Flood Cloud: 48 hours

  • Time saved using Flood Cloud: 68 days

  • High performance computers cost: £0

  • Extra licence costs: £0

  • Additional labour costs: £0

Continuing to manage flood risk in the Isle of Axholme is vitally important. Ending water management activities could result in extensive flooding to many thousands of homes and businesses, over 30,000ha of high-grade agricultural land, internationally important conservations sites and major critical infrastructure. A total of 15,761 residential properties, 921 businesses and 3 major road networks were at risk and the economic assessment has valued the area at £5.2billion over 100 years.

The detailed project appraisal for short term and long term continued operation of the pumping station (gravity and pumped discharge) included hydraulic modelling and a full economic assessment for each of the proposed options.

Keadby Pumping Station Area

Keadby Pumping Station Study Area - Source: CAPITA

Hydraulic modelling using Flood Modeller and TUFLOW

The hydraulic model for the River Torne / Isle of Axholme was created using Flood Modeller's 1D solver and TUFLOW's 2D solver. 

The dependency of the low-lying land setting makes for a complex network of pumping stations (19 in total). The terminal assisted outfalls are complex systems combining pumping stations, gravitational culverts and outfalls which work in response to the tidal levels on the River Trent to help push through high flow when gravity is low.

With the full economic appraisal requiring analysis of five return periods with five climate change scenarios for each, and multiple option scenarios for the pumping station, a total of 30 model runs per option was needed. This equated to approximately 100 runs in total. Using the local Flood Modeller licenses available to the Capita modelling team, models could be run in 2 iterations of 50 model runs which would have taken approximately 70 days of processing time and would have a subsequent impact on other Capita projects requiring access to the licenses.

Harnessing the power of Flood Cloud

The Capita hydraulic modelling team approached Jacobs to gain access to Flood Cloud for all model runs for Keadby. The decision was based on the high number of model simulations required but also due to the complexity of the model.

Using Flood Cloud enabled Capita’s project team to run approximately 100 simulations in 2 days instead of 70. The time saving enabled the modellers to build more precise models with better and more accurate calibration. They were able to model and run more options which led to better decision-making to choose the preferred option. The use of Flood Cloud also provided software savings in excess of £350,000.

Time pressure was high, and the modelling had to be accurate because the ‘do nothing’ scenario meant that 15,761 residential properties, 921 businesses and 3 major road networks were at risk.

The responsibility for the modellers was to provide accuracy in order to reach the preferred option quickly and avoid outfall.

Flood Cloud allowed the project team to run approximately 100 simulations in 2 days instead of 70. The time saving enabled the modellers to build more precise models with better and more accurate calibration. They were able to model and run more options which led to better decision-making to choose the preferred option. The use of Flood Cloud also provided software savings in excess of £350,000.

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