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Name: Overland Flow Paths 2021
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Description: <DIV STYLE="text-align:Left;font-size:12pt"><DIV><P><SPAN>Overland flow paths were derived from a flow accumulation surface that was extracted from a hydrologically corrected DEM. Flow paths were defined using a flow accumulation threshold of 500 cells, i.e. to qualify for inclusion in the flow path network, a minimum catchment area of 2,000 m2 was required (500 cells x 4 m2 each). OLFPs were delineated iteratively, with additional burn lines created with each iteration to correct flow paths that spill out of their channels and follow an incorrect trajectory. This is often caused by manmade structures such as bridges but also natural features such as dense vegetation incorrectly included within the DEM (as opposed to the surface model or DSM). Additionally, significant stormwater pipes were utilised as these pipes are unlikely to reach capacity and have a significant role in the conveyance of water. Several iterations using this approach were conducted until a fair representation of the flow paths was obtained. Flow paths were first converted to vector polylines. The resulting feature class can be visualized by symbolizing on the catchment area.</SPAN></P></DIV></DIV>
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