WMS:Quick Tour - Flow Accumulation

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In addition to defining the flow direction from each DEM cell, the TOPAZ program determines the flow accumulation for each DEM cell. The flow accumulation is an integer number and represents the number of upstream DEM cells whose flow paths "pass through" the given DEM cell. In the figure below a display values has been set so that each DEM cell whose flow accumulation is greater than or equal to 200 is shown in blue. In reality it approximates where "channels" are on the DEM and is an essential part of establishing watershed boundaries.

Dem3.jpg


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WMS – Quick Tour
Overview:Getting Started   •   Layout   •   Modules   •   Tools   •   Macros   •   Properties Window   •   Help StripWMS.PNG
Modules:Background Images   •   Draped Images   •   Terrain Data   •   DEMs   •   Flow Direction Vectors  •   Flow Accumalation  •   Watershed Outlet   •   Basin Delineation  •   TINs   •   Conceptual Model   •   Creating the TIN  •   Outlet Point Creation   •   Basin Delineation Flow Paths   •   Coverages  •   Feature Object Data   •   Storing the DEM Delineation   •   Conceptual Model for TINs   •   Creating Watershed Models Directly   •   Land Use   •   Soil   •   GIS Data   •   GIS with ArcObjects   •   Adding GIS Data   •   Join Tables   •   Travel Time Computations   •   More Travel Time Computations   •   Channel Calculations   •   Cutting Cross Sections   •   Curb and Gutter Flow   •   Culvert Hydraulics
Models:HEC-1   •   HEC-1 Lag Time and TC  •   HEC-1 Curve Numbers  •   HEC-1 Thiessen Gage Weights  •   HEC-1 Storage Capacity Curves  •   HEC-1 Time Area Curves   •   HEC-1 Area Between Contours   •   TR-20   •   TR-20 Lag Time   •   TR-20 Curve Numbers   •   Rational   •   Ration IDF Curve   •   NSS   •   HSPF   •   More HSPF   •   LA County Hydrology   •   Maricopa County Hydrology   •   HEC-RAS   •   Storm Drain   •   Further Storm Drain
Functionalities:Floodplain Delineation   •   More Floodplain Delineation   •   Additional Floodplain Delineation   •   Detention Basin Analysis   •   Composite Curve Numbers   •   Post Processing   •   More Post Processing   •   Finding Data   •   Support
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