20240814 21411600 1.0 FALSE Ngongotaha_Catchment_1_AEP_MaxHazard_banded 1874384.000000 1883504.000000 5776288.000000 5787160.000000 1 002 Projected GCS_NZGD_2000 Linear Unit: Meter (1.000000) NZGD_2000_New_Zealand_Transverse_Mercator <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.8'><WKT>PROJCS["NZGD_2000_New_Zealand_Transverse_Mercator",GEOGCS["GCS_NZGD_2000",DATUM["D_NZGD_2000",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",1600000.0],PARAMETER["False_Northing",10000000.0],PARAMETER["Central_Meridian",173.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",2193]]</WKT><XOrigin>-4020900</XOrigin><YOrigin>1900</YOrigin><XYScale>450445547.3910538</XYScale><ZOrigin>0</ZOrigin><ZScale>1</ZScale><MOrigin>0</MOrigin><MScale>1</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>2193</WKID><LatestWKID>2193</LatestWKID></ProjectedCoordinateSystem> 20240626 16201900 20240626 16201900 5000000 5000 ISO19139 SDP87558 Coordinate system  New Zealand Transverse Mercator 2000 Vertical datum  Moturiki Vertical Datum 1953 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_1_AEP_MaxHazard_banded Ngongotaha Catchment Flooding SDP87558 <DIV STYLE="text-align:Left;"><DIV><DIV>refer Ngongotaha Flood Modelling - Model Build and Design Scenarios Report (22/03/2024)Document set Id - 20248149Source location87558_Ngongotaha_Flood_Modelling_2024Dataset name 2D_code_002_RProposed RDC name Ngongotaha_Catchment_BoundaryG6 name Ngongotaha Catchment Modelling Boundary Dataset name Scenario_1AEP_Max_Depth_polyProposed RDC name Ngongotaha_Catchment_1_AEP_maxdepthG6 name Ngongotaha Catchment 1% AEP Max DepthDataset name Scenario_1AEP_Max_HAZRD_polyProposed RDC name Ngongotaha_Catchment_1_AEP_maxhazardG6 name Ngongotaha Catchment 1% AEP Max HazardDataset name Scenario_1AEP_CC2130_Max_Depth_polyProposed RDC name Ngongotaha_Catchment_1_AEP_2130_maxdepthG6 name Ngongotaha Catchment 1% AEP 2130 Max DepthDataset name Scenario_1AEP_CC2130_Max_HAZRD_polyProposed RDC name Ngongotaha_Catchment_1_AEP_2130_maxhazardG6 name Ngongotaha Catchment 1% AEP 2130 Max DepthDataset name Scenario_1AEP_Max_WL_polyProposed RDC name Ngongotaha_Catchment_1_AEP_2130_maxWLG6 name Ngongotaha Catchment 1% AEP 2130 Max Water LevelDataset name Scenario_1AEP_CC2130_Max_WL_polyProposed RDC name Ngongotaha_Catchment_1_AEP_maxWLG6 name Ngongotaha Catchment 1% AEP Max Water Level<A href="https://www.rotorualakescouncil.nz/our-services/planningservices/districtplan/proposed-district-plan-research">Planning and Development Research and Supporting Documents - Rotorua Lakes Council</A></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_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. HazardInteger HazardInteger SmallInteger 2 5 0 HazardLevel HazardLevel String 50 0 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 /9j/4AAQSkZJRgABAQEAAQABAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0a HBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/2wBDAQkJCQwLDBgNDRgyIRwhMjIyMjIy MjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjL/wAARCACFAMgDASIA AhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQA AAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3 ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWm p6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6/8QAHwEA AwEBAQEBAQEBAQAAAAAAAAECAwQFBgcICQoL/8QAtREAAgECBAQDBAcFBAQAAQJ3AAECAxEEBSEx BhJBUQdhcRMiMoEIFEKRobHBCSMzUvAVYnLRChYkNOEl8RcYGRomJygpKjU2Nzg5OkNERUZHSElK U1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6goOEhYaHiImKkpOUlZaXmJmaoqOkpaanqKmqsrO0tba3 uLm6wsPExcbHyMnK0tPU1dbX2Nna4uPk5ebn6Onq8vP09fb3+Pn6/9oADAMBAAIRAxEAPwD3+iii gAooooAKKKKACiiigAooooAKKKKACiiigCK4uIbWEzTyLHGCAWY8DJwP1IqG31SyupY4oLlHkki8 1VHUpnGfz4qxLFHPE0U0aSRtwyOoIP1BrzTUDP4T8UyjS1QRzINvmfNgHGRwc8Ht6fnQB6dRVawv 7fUbVbi2kV0PB2nOD3FWaACiiigAooooAKKKKACiiigAooooAKKKKACiiigDjfEnirVNIvHjhs4o 4QwEbzgky8clcH1/p68Ul8YyWJFxNHc3M03LozeVFFxnC5Bz06+x/HrNQ8P6XqkyzXdqHlXo6uyn 9CKzY/A+mRggTXJySQfkBXOQcEKD3oAxk8f3shnZNNjZEXdhXLbQCcknuOnTpW1ofiuLUVmF8be0 kiIGDKMHv34H5nv6U+bwjp32B0WOaedUYxtNcv8AexweDgflXDvpctvPJFLaZljBCmWYNnCnKl1x gkkYBBznGaAPVo5UmQPGwZT3FPryaAiOQNbu0Ukm0gQlg6YYA7M8seGGMkHgccCur8PeLo7ud7S9 mT5QoinIwH4JO49AcD26GgDrqKajrIiujBkYZVlOQR6inUAFc74l8LRa2gnhKxXi4+YjiTHQN/j2 roqKAPM/DuoT6BqBgm3rZFmLkj5SM4LgeowvA7E16YCCAQcg15dqlhPH4iul2CBv3jqI+Sy8FcZO Dzg4GO47caHh/wAQXEOrQ2cl00lo8rLmUj+LO3nqDkdM+v1pbAeg0UUUwCiiigAooooAKKKKACii igAooooAKKKKACiiigAqC7s7e+t2guYlkibqp/x7VPRQBxOreFvsbS3sMqyRk8pMu9kyeoZjknp3 GfQ5rlY44IZHeWSRoNpYmJkRmHbK84GT1Iz7Dt7BXJa/4VMzteaeG39Wt1wFLf3gf59c9OKAOZ0/ XtS0J2hZ0K5Ijjc7lK9RhQw2g8c4/rntNH8V2Oo2SyXMkdpcDh4pXxz2Iz1Brg722LO73EE/lxKB AjvhhgHK+W3PJ5OOBk4B6GjcgQlVaNGCJtPlcnnp1HX3568cYFAHssM8NwrNDKkgVijbTnDDqD71 JXk2japLpeorPasy23AnG0bGwehxnt3xkV6JbeItLuIDI11HCVxuWY7SD078H8KLgcx4wsVstRTU BHGIZh85ZSfmHUZ6DcCfYkc+p5Ka4mhuIrsIpeOXeoBJOVOSTx1GBzjndmu28S+K4Ghl02ySObzU IednwiA+mOT1+lcRY2Fzd3FvHbol3c3IYNHKjZjAyCSTx75Hp+FJgex2c7XVlDO8TQtIgYxv1XPa p6Rd2wbgA2OcetLTAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooA828ZWslnrMs oleT7SmUULgx564Pfheg9fz5yOcRPs8qR9yrwRyOOq9OQecDt0I613fj0TiC2fyQ1sNytICSVZsD kdCD+f8AXgZJoUWPbEzGP73m52tjjGBjHPT0z60ASyRRGUJGJ4fMJbcyMQ/HQY5PfnHOe1Mjf7M6 tFEGC/MquQWTjDZXoencVLe77e4jkjRGSRBIoRRgjqeR9D79j0ppxcyr5hZCfm3hs7VAx1JOO3XO O3oUBXW45jMyPhfmIBUDH0xycZ5Pt6V6Z4K0ZNO0hbtk/wBIuxvJI5CdVH65rzKebbDskjYOwyrb VHfB7crwBjjGPrn2612/ZIdoAXy1wB6YpgS0UUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFF ABRRRQAgOSeCMfrXL6v41t9OmSO3tmugTy4cKuM4OPXnj8/SuprF1HwrpWpT+fLE0cvdom2569un cnPWgDj9Y8TnV7iFfLntraNgCPMGHbIJHOASB6kj86y3/si9cxXM5smULiVE8wE4y+QBkc9B2xjp jHU6/wCGbDTLSXUrOU27ptKxPl43OenrluB+neuM+ZGVpEhRDgGMpvL89MnBHIweRQBVhlhtxLE6 M6kFo3I654BK5x79/wAal+228fkBk8+NRkoCVIyScZOehx1BHH52Hk8yN5J2hCkZTdFt5J5I2j6n g4OOc5xWbJezSkhm4Ygtnvx3PXHtS1AbcTwygeVCyHqxZ9xLd8dOPzPvXtuk8aRZgSpNthVfMQYD YGM14YODkDcBzzXvNpcR3dnDcxf6uVFdfoRmmBNRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQA UUUUAFFFFABRRRQBx2saBrGua8ZswWtpFiNGZtxkXqSV5B5zwcVg+IvDcnh2y8+GbzopWAZjGFKM Og45/UDK+uK9PpksUc8TRTRrJG4wyMMgj3FAHhb3cgT5Q6F1IJLEggnnH5Y/CoGcycsPm9QMfnXT eLrNdN1NrKBdlvjzVjZsrye2eRznvWK9p5CLIZ4GftEBuPQHnPHQ+p5GKm/cCkoBB5wQPWvW/A8E kfhq3ke6eVZMlEOMRgMeB365rze70Se206G+3xPbScI6Mcsfp145/Kuu+HOqs6XGmSvnb+9iyf8A vofyP50RkpaoDvqKKKoAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAoqC8uHtb SSZIWmZBkRr1NefTePtWF0ALSGAbR+7kUnnnB6g88D8M96ANTx5brusriVgtvlkkKqN2QCQMnseR 0/nXLTTeVZCa3mEsjqDvSVwysqjJIxnqCQc44zVnVtZl1W7ja8ELmBGEbW6tsO7r97rxgAgjnn0q g0N0lm9w6tBE+VXACbyc52rx24OB0/KgB9pe266c+n3qbA0hJcgtsGM/KufY/jj3rL0+4msdQhur WUJJG42sfu59D7Hmtm007UtTMH2SxJnhjLiR4wgYNkjluDyTj6e9bukeBU89k1BptsShgF+UFm9O o4wOntmoUeV6dRnX6TqkWq2pdVMc8Z2zQseY29Pceh71frltI0HULTUPNkmMflPtEu4HzYskhNvY DsTyM45wDXU04ttaiCiiiqAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigArg/H2n+XPB qUaJtZdkpY8EjkcYxnGfyrvKw/FmnXWpaI0VpFFLIkiyeW45bHoc8H+mRQBQ8PeEtMgjtdSZ3upm RZELtlFJGRgd8e/pmumntbe6VVuIIplU7gJEDAH15qro12bzTIpDZvaFfkMDjGzHGOgq/QAgAUAA AAcACloooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKKKKACiiigAooooAKK KKACiiigAooooAKKKKACiiigD//Z