Simulation of sustainable stormwater infiltration strategies in Odense, Denmark

The developed urban hydrology model ‘MODFLOW-LID’ was demonstrated for case-areas in the city of Odense. Different NBSstrategies were simulated on detailed scale (Figure 1) and upscaled by the model to neighbourhood scale (Figure 2). NBS-strategies included the use of rainwater tanks, green roofs, raingardens and soakaways on private parcels as well as swale-trench systems with water brakes and overflow to the existing sewer system underneath roads. Special attention was given to the simulation of rainwater harvesting (rain tanks) and green roofs in combination with infiltration devices to manage sustainable infiltration strategies in terms of both maximising the infiltration, minimising the risk of a shallow groundwater table underneath buildings and delaying stormwater runoff to the existing sewer system. As the illustration in figure 2 shows, the model was used to simulate different stormwater infiltration strategies and the associated depth to the groundwater table in a residential area: (a): actual situation (baseline scenario) without stormwater infiltration; (b): massive stormwater infiltration leading to a critical shallow groundwater table in low-laying parcels; (c): the use of green roofs to reduce stormwater infiltration volume leading to less critical depth to the groundwater table.

Courtesy: The Foundation for Development of Technology in the Danish Water Sector – VTU, NIRAS, VCS Denmark, Municipality of Odense, Aarhus University, GEUS

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