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This dataset is derived from the Overland Flow Paths and has been dissolved to create a simplified featureclass to be used for the Auckland Councils Geomaps Data Extract output.
Overland flow paths predict the natural flow of water over the ground when the stormwater network is overloaded. The OverlandFlowPaths layer is based on Auckland Council’s most recently captured LiDAR data, which was flown in 2016 and became available after processing in 2018. The layer has been attributed with TP108 graphical peak flows and runoff volumes along every flow path in the region.
<div style='text-align:Left;'><div><div><p><span>Overland flow paths (OLFPs) were re-mapped for the Auckland region in 2019 by WSP using LiDAR data flown in 2016 and 2017. The OLFPs were re-mapped using a 1m DEM formed from ground points. Nearly 6,000 manual adjustments to the DEM were used to map the overland flow paths in flat and depression areas. </span></p><p><span>OLFPs were identified using GIS techniques and are not based on hydraulic modelling. </span></p><p><span>Peak flow rates and runoff volumes for 2-, 10- and 100-year annual recurrence interval (ARI) and 90th and 95th percentile events have been attributed to each overland flow path, following the graphical method outlined in Guidelines for Stormwater Runoff Modelling in the Auckland Region: Technical Publication 108 (TP108). Both the existing scenario (existing imperviousness and rainfall) and the future scenario (future development and rainfall due to climate change) are represented here; two climate change scenarios were considered, viz., temperature increases of 2.1 and 3.8 degrees-C. </span></p><p><span>The aim of this dataset is to provide a regionally consistent validation tool for runoff calculations and hydraulic modelling to assist consultants, contractors, development engineers, catchment managers and hydraulic modelling staff. </span></p><p><span>A copy of the full background report can be obtained from the Regional Planning team in Auckland Council’s Healthy Waters department. The data will be updated on an ad hoc basis to align with updates to Auckland Council’s LiDAR data. </span></p><p><span>Vertical Datum: NZVD1946 </span></p></div></div></div>
WSP
Auckland Council: Healthy Waters, Geospatial
Overland Flow Paths
FloodingOverland Flow PathsTP108Peak FlowRainfallClimate ChangeStormwater
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>For both Auckland Council internal and external use.</SPAN></P><P><SPAN>Licensing: Creative Commons (refer to Healthy Waters) </SPAN></P></DIV></DIV></DIV>
Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362
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PUBLICATION.MASTER.OverlandFlowPathsDissolved
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