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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_1_AEP_2130_MaxHazard_banded Ngongotaha Catchment Flooding SDP87558 <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><P><SPAN>Source location</SPAN></P><P STYLE="font-weight:bold;"><SPAN><SPAN>87558_Ngongotaha_Flood_Modelling_2024</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Dataset name 2D_code_002_R</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Proposed RDC name Ngongotaha_Catchment_Boundary</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>G6 name Ngongotaha Catchment Modelling Boundary </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN /></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Dataset name Scenario_1AEP_Max_Depth_poly</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Proposed RDC name Ngongotaha_Catchment_1_AEP_maxdepth</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>G6 name Ngongotaha Catchment 1% AEP Max Depth</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Dataset name Scenario_1AEP_Max_HAZRD_poly</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Proposed RDC name Ngongotaha_Catchment_1_AEP_maxhazard</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>G6 name Ngongotaha Catchment 1% AEP Max Hazard</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Dataset name Scenario_1AEP_CC2130_Max_Depth_poly</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Proposed RDC name Ngongotaha_Catchment_1_AEP_2130_maxdepth</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>G6 name Ngongotaha Catchment 1% AEP 2130 Max Depth</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Dataset name Scenario_1AEP_CC2130_Max_HAZRD_poly</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Proposed RDC name Ngongotaha_Catchment_1_AEP_2130_maxhazard</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>G6 name Ngongotaha Catchment 1% AEP 2130 Max Depth</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Dataset name Scenario_1AEP_Max_WL_poly</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Proposed RDC name Ngongotaha_Catchment_1_AEP_2130_maxWL</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>G6 name Ngongotaha Catchment 1% AEP 2130 Max Water Level</SPAN></SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Dataset name Scenario_1AEP_CC2130_Max_WL_poly</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Proposed RDC name Ngongotaha_Catchment_1_AEP_maxWL</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>G6 name Ngongotaha Catchment 1% AEP Max Water Level</SPAN></SPAN></P><P><SPAN /></P><P STYLE="margin:0 0 0 0;"><A href="https://www.rotorualakescouncil.nz/our-services/planningservices/districtplan/proposed-district-plan-research"><SPAN><SPAN>Planning and Development Research and Supporting Documents - Rotorua Lakes Council</SPAN></SPAN></A></P><P><SPAN /></P></DIV></DIV></DIV> Awa Environmental - www.awa.kiwi Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.0.12790 1 176.125743 176.233796 -38.018935 -38.119582 Ngongotaha_Catchment_1_AEP_2130_MaxHazard_banded Feature Class 0 OBJECTID OBJECTID OID 4 10 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Shape Geometry 4 0 0 Feature geometry. Esri Coordinates defining the features. HazardLevel HazardLevel String 50 0 0 HazardInteger HazardInteger SmallInteger 2 5 0 Shape.STArea() Shape.STArea() Double 0 0 0 Shape.STLength() Shape.STLength() Double 0 0 0 Feature Class dataset EPSG 7.9.4(9.0.0) 0 Simple FALSE 0 TRUE FALSE 20240626