While undertaking a recent modelling study Kiara undertook a sensitivity analysis comparing the use of the Ground Infiltration Model (GIM) and Fixed Runoff hydrology models within InfoWorks ICM to achieve calibration.

The flow data recorded indicated that there was a slower infiltration process occurring in the sewer, however as the GIM could only be calibrated to a small recurrence interval event there was little confidence in its ability to predict infiltration from the 5year design storm without further calibration.

The presentation discussed the theory behind the GIM, how it was applied for this project and why it was ultimately not adopted.