The goal of this project was to update the hydrological and hydraulic model of the Tākaka River and its floodplain to improve Tasman District Council’s flood management.
The Tākaka River has complex hydrology with flows originating from a large upper catchment with additional inflows from the Waingaro and Anatoki Rivers. These surface flows have a significant interaction with groundwater and an underground ‘karst’ cave system that can attenuate flows depending on antecedent conditions.
A large rain-on-mesh hydraulic flood model was developed to represent the Tākaka River and its local catchment, including the Waingaro and Anatoki Rivers. Upper catchment hydrology was represented through flow gauge analysis and rainfall-runoff hydrological modelling of ungauged catchments. The flood model was validated against four historic flood events and then used to simulate key design events including the effects of climate change. The developed flood model was then able to be used to test different design scenarios related to the catchment’s flood management.
This project demonstrates e2Environmental’s ability to model large river catchments with a commitment to collaboration and ensuring the model is fit for purpose.
Project manager(s)
Daniel McMullan
Services involved:
