HydroLogic developed a new D-HYDRO model of Rijnland’s boezem system in close collaboration with the water board. The model covers both the boezem waters and the draining polders, including (the control of) pumping stations, weirs, bridges, culverts and peak storage. For reproducibility and efficiency, the model was largely built automatically using D-HyDAMO and additional Python scripts.
After calibration and validation on historical rainfall events, extensive stochastic calculations were carried out. These included, among other things, different climate scenarios, rainfall patterns, pumping station failures and the probability of high external water levels. By clustering stochasts smartly, we were able to reduce the number of simulations while maintaining the quality and reliability of the results. The results have been made available in an interactive water level statistics tool, with which Rijnland can itself analyse and compare climate scenarios and the effects of stochasts.
