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Boundary extent of the modelling
Rotorua Lakes Council (RLC) identified Ngongotahā in the Rotorua Spatial Plan 2018 as a key growth area that requires a flood model that covers the wider Ngongotahā area. This report summaries the flood model build process and application to a series of design event simulations. The specific objectives of this study are to: build and validate a TUFLOW flood model for catchments that are part of the Ngongotahā township; and to simulate the flooding conditions 0.2%, 1% and 10% Annual Exceedance Probability (AEP) design events. This report includes: an overview of the study location; summary of model features and model build process; model verification and sensitivity analysis; application to flood hazard mapping; and conclusions and recommendations. The model validation was completed against an approximately 1 % AEP event that occurred in April 2018. Previous flood model extents and property level flood incident records were used to successfully validate the model. The following design runs were completed for both current and future climates. Freeboard has not been included in the model simulations. Design events completed 10 % AEP scenario 10 % AEP rainfall and 50 % AEP lake level – current climate (2020) 50 % AEP rainfall and 10 % AEP lake level – current climate (2020) 10 % AEP rainfall and 50 % AEP lake level – climate change (2130, RCP8.5) 50 % AEP rainfall and 10 % AEP lake level – climate change (2130, RCP8.5) 1 % Annual Exceedance Percentage (AEP) scenario 1% AEP rainfall and 5 % AEP lake level – current climate (2020) 5% AEP rainfall and 1 % AEP lake level – current climate (2020) 1% AEP rainfall and 5 % AEP lake level – climate change (2130, RCP8.5) 5% AEP rainfall and 1 % AEP lake level – climate change (2130, RCP8.5) 0.2 % AEP scenario 0.2 % AEP rainfall and 0.5 % AEP lake level – current climate (2020) 0.5 % AEP rainfall and 0.2 % AEP lake level – current climate (2020) 0.2 % AEP rainfall and 0.5 % AEP lake level – climate change (2130, RCP8.5) 0.5 % AEP rainfall and 0.2 % AEP lake level – climate change (2130, RCP8.5) The model can be considered robust to support growth planning, hazard identification, catchment planning and concept level engineering design. For use in more detailed applications the following additional model improvement could be considered: use of more sophisticated upper catchment hydrological methods; validation against a 10 % AEP event; validation against measured discharges in the lower Ngongotahā and Waiteti Streams; additional investigation into flood incident reporting for events outside of April 2018; survey of secondary channels and flow paths in areas of interest; incorporation of bridges; stormwater asset survey in the areas when doing detailed engineering design; additional sensitivity analysis such as network blockage scenarios and impact of antecedent moisture conditions; and identification of any areas where groundwater may impact flood predictions.
Ngongotaha_Catchment_Boundary
Ngongotaha Catchment
Flooding
Boundary
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>refer Ngongotaha Flood Modelling - Model Build and Design Scenarios Report (22/03/2024)</SPAN></P><P><SPAN>Document set Id - 20248149</SPAN></P></DIV></DIV></DIV>
Awa Environmental - www.awa.kiwi
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20240625