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SDP89185
Greater Utuhina Catchment Model (GUCM), 2022
Coordinate system New Zealand Transverse Mercator 2000 Vertical datum Moturiki Vertical Datum 1953 This map layer represents data from the Greater Utuhina Catchment flood study (a Bay of Plenty Regional Council contracted analysis) and shows a set of spatial data that indicate areas of land at risk of flooding from the Utuhina Stream, Mangakakahi Stream and Otamatea Stream.
The GUCM deliverables depict and quantify the flood susceptibility from fluvial (riverine) flooding for the study area, e.g. the river channels are no longer able to hold the volume of water and breach the banks. All spatial data for this project provided in terms of NZGD2000 New Zealand Transverse Mercator 2000, horizontal datum. The vertical datum for maximum water levels is Moturiki Vertical Datum–1953.
WARNING - this dataset will be referred to as the following for all Rotorua Lakes Council internal applications (in particular GeyserView)
Source location:
89185_Greater_Utuhina_Catchment_Flood_Modelling_Ratified
Dataset name BOPRC_Greater_Utuhina_Catchment_1_AEP_2130_FB_maxwl_Poly
Proposed RDC name BOPRC_Greater_Utuhina_Catchment_1_AEP_2130_FB_maxwl
G6 name Greater_Utuhina_Catchment 1% AEP 2130 FB Max Water Level (BOPRC)
Dataset name BOPRC_Greater_Utuhina_Catchment_1_AEP_2130_FB_maxdepth_Poly
Proposed RDC name BOPRC_Greater_Utuhina_Catchment_1_AEP_2130_FB_maxdepth
G6 name Greater_Utuhina_Catchment 1% AEP 2130 FB Max Depth (BOPRC)
https://www.rotorualakescouncil.nz/our-services/planningservices/districtplan/proposed-district-plan-research |
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SDP89185
Greater Utuhina Catchment Model (GUCM), 2022
Coordinate system New Zealand Transverse Mercator 2000 Vertical datum Moturiki Vertical Datum 1953 This map layer represents data from the Greater Utuhina Catchment flood study (a Bay of Plenty Regional Council contracted analysis) and shows a set of spatial data that indicate areas of land at risk of flooding from the Utuhina Stream, Mangakakahi Stream and Otamatea Stream.
The GUCM deliverables depict and quantify the flood susceptibility from fluvial (riverine) flooding for the study area, e.g. the river channels are no longer able to hold the volume of water and breach the banks. All spatial data for this project provided in terms of NZGD2000 New Zealand Transverse Mercator 2000, horizontal datum. The vertical datum for maximum water levels is Moturiki Vertical Datum–1953.
WARNING - this dataset will be referred to as the following for all Rotorua Lakes Council internal applications (in particular GeyserView)
Source location:
89185_Greater_Utuhina_Catchment_Flood_Modelling_Ratified
Dataset name BOPRC_Greater_Utuhina_Catchment_1_AEP_2130_FB_maxwl_Poly
Proposed RDC name BOPRC_Greater_Utuhina_Catchment_1_AEP_2130_FB_maxwl
G6 name Greater_Utuhina_Catchment 1% AEP 2130 FB Max Water Level (BOPRC)
Dataset name BOPRC_Greater_Utuhina_Catchment_1_AEP_2130_FB_maxdepth_Poly
Proposed RDC name BOPRC_Greater_Utuhina_Catchment_1_AEP_2130_FB_maxdepth
G6 name Greater_Utuhina_Catchment 1% AEP 2130 FB Max Depth (BOPRC)
https://www.rotorualakescouncil.nz/our-services/planningservices/districtplan/proposed-district-plan-research |
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Bay of Plenty Regional Council |
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5000 |
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[] |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>Regional Council has engaged Blue Duck Consultants and DHI Water and Environment Ltd to prepare a hydrological and hydraulic model, which combined we refer to as the Greater Utuhina Catchment Model (GUCM).</SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>The hydrological model (a Non-Linear Reservoir model) is intended for flood forecasting purposes and support design investigations within the catchment. The hydrological model calculates runoff from rainfall at 122 separate sub-catchments within the wider Utuhina Stream catchment. Stream flows from runoff are tracked through a network of routing branches to Lake Rotorua. </SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>DHI extended the existing 2014 hydraulic model of the lower Utuhina reach to include the Utuhina Stream and its tributaries (Mangakakahi Stream and Otamatea Stream) upstream of the urban environment. The hydraulic model does not explicitly include the Rotorua Lakes Council's stormwater pipe network. Inflow hydrographs, each representing the flow contribution from a sub-catchment, were derived from the hydrological model and applied as a point or distributed inflows to the hydraulic model. </SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>These two models were built and calibrated in unison for current land use and current climate change scenarios, following which climate change prediction were made to the year 2130.</SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>For further information refer to </SPAN></SPAN><SPAN STYLE="font-style:italic;font-weight:bold;"><SPAN>DHI “Utuhina - Phases 2 and 3 Numerical Modelling”, August 2021 and DHI “Utuhina – Additional Modelling and Mapping</SPAN></SPAN><SPAN STYLE="font-size:16pt"><SPAN>(</SPAN></SPAN><SPAN STYLE="font-style:italic;font-weight:bold;">Addendum Report)”, August 2022.</SPAN></P><P STYLE="font-weight:bold;margin:0 0 8 0;"><SPAN><SPAN>Purpose of Model</SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>The GUCM has primarily been built to undertake a capacity review of the lower Utuhina Stream flood protection scheme and to assess the relative impacts of any potential flood mitigation measures on a catchment-wide scale. </SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN>Its secondary purpose is to provide information on areas susceptible to fluvial (riverine) flooding for emergency planning, provide flood level advice in the vicinity of the streams, and provide boundary conditions for the stormwater network assessments.</SPAN></P><P STYLE="font-weight:bold;margin:0 0 8 0;"><SPAN><SPAN>Limitation of data</SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>The data layers are generated from catchment level modelling based on the datasets, requirements and technology available at the time of model build.</SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>There are multiple sources of uncertainty in deriving these maps including:</SPAN></SPAN></P><UL STYLE="margin:0 0 0 0;padding:0 0 0 0;"><LI><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>The accuracy of gauging data and rating curves and associated estimated flood discharge for the chosen design events.</SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>Hydrologic assumptions, including antecedent rainfall</SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>The definition of floodplain topography and channel cross-sections.</SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>The choice of effective hydraulic roughness coefficients.</SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>The choice of the hydraulic and hydrologic models and their representation of the physics.</SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>The treatment of floodplain infrastructure.</SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>The consideration of the performance of flood defences.</SPAN></SPAN></P></LI><LI><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>The potential for non-stationarity processes arising from both catchment change (land-use and/or land management changes) and climate variability and/or change.</SPAN></SPAN></P></LI></UL><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>No detailed uncertainty analysis has been carried out. However, a freeboard margin (factor of safety) has been applied to the design flood levels to account for uncertainties. Areas of greater uncertainties received a greater freeboard margin for the design levels, such as the lower portion of the catchment.</SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>The flood maps shown</SPAN></SPAN><SPAN /><SPAN /><SPAN><SPAN>are</SPAN></SPAN><SPAN STYLE="font-weight:bold;"><SPAN>fluvial (riverine)</SPAN></SPAN><SPAN /><SPAN /><SPAN STYLE="font-weight:bold;"><SPAN>flooding maps only</SPAN></SPAN><SPAN><SPAN>, e.g. flooding from the streams but do not explicitly show flooding from direct localised rainfall or from pipe surcharges. </SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>Urban flooding from direct localised rainfall and from pipe surcharges are beyond this study and would need to be established by a suitable rain-on-grid model.</SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN>As such, the design flood levels cannot solemnly relied upon for finished floor level determination within the urbanised subcatchment area as these areas may have other contributing (localised) factors that are not considered.</SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>Before using this data, please note the use limitation:</SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>Bay of Plenty Regional Council (Regional Council) provides the data as a public resource of general information for use “as is” without warranty of any kind. </SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>Regional Council provides this information with the understanding that it is not guaranteed to be accurate, correct or complete and any conclusions drawn from such information are the sole responsibility of the user. </SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>Further, the Regional Council makes no warranty, representation or guaranty as to the content, sequence, accuracy, timeliness or completeness of any of the spatial or database information provided herein. While every effort has been made to ensure the content, sequence, accuracy, timeliness or completeness of materials presented within this dataset, the Regional Council assumes no responsibility for errors or omissions, and explicitly disclaims any representations and warranties, including, without limitation, the implied warranties of merchantability and fitness for a particular purpose. </SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>Regional Council recommends that you independently verify the accuracy, currency and reliability of any information upon which you intend to rely.</SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>The GIS data made available by Regional Council may be amended and updated by the Council without notification. </SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>The Regional Council shall assume no liability for: </SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>1 Any errors, omissions, or inaccuracies in the information provided, regardless of how caused; or </SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>2. Any decision made or action taken or not taken by user in reliance upon any information or data furnished hereunder. </SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN><SPAN>Use Restrictions: </SPAN></SPAN></P><P STYLE="margin:0 0 8 0;"><SPAN>The included datasets shall NOT be redistributed, in any form, to any other parties, or used in any other projects, current or future, without prior consent of the Regional Council.</SPAN></P></DIV></DIV></DIV> |
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Asset.DBO.BOPRC_Greater_Utuhina_Catchment_1_AEP_2130_FB_MaxDepth_banded |
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["Flood Model","Greater Utuhina Catchment","Greater_Utuhina_Catchment_BOPRC_1%AEP_2130_FB_maxdepth","SDP89185"] |
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en-NZ |
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50000 |
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