Latest Contributions by ChristineDartiguenave

Arc Hydro started with dendritic terrain processing only but has been extended over the years through work with the Southwest Florida Water Management District to handle both flat areas with sinks (what we call Deranged terrain) and structures such as culverts or pipes. Deranged Terrain In flat areas water may flow toward the sinks. There are catchments associated to sinks in Arc Hydro as well. The connectivity between deranged catchments is established  through the lowest point on the  shared boundary (Drainage Morphology tools). You can also set a preferential path between the catchments that will allow you to trace "downstream" like in a dendritic terrain network. Structures Basically you can extent your standard Arc Hydro Geometric Network with junction/edges representing the structures that you would need in your model. Arc Hydro does not do modeling but will help you with preparing the input data required for your model and with visualizing your results. Christine Dartiguenave Esri Water Resources Team ... View more

As we are moving toward the geoprocessing environment, we have removed these functions from the toolbar because you can use out-of-the-box ArcGIS geoprocessing tools to get the same results: Slope greater than 30 and Slope greater than 30 and facing North: you can use the Spatial Analyst's Con tool to set the conditions on the input slope grid. Weighted flow accumulation: you can use the Spatial Analyst's Flow Accumulation tool with an input weight raster. Christine Dartiguenave Esri Water Resources Team ... View more

There is a tool in the Arc Hydro Tools toolbox > Attribute Tools toolset called Assign River Order that will calculates the stream order using 3 different methods: Strahler: if different upstream orders, then maximum of the upstream orders, if more than 1 with maximum order, then max order +1. Shreve: add upstream orders. PU_Order: downstream feature river order = maximum of upstream features river order + 1 (PU stands for Processing Unit). This tool uses the attributes HydroID/NextDownID in the input feature class to determine the downstream direction. It does not support flow splits or loops at this time. Christine Dartiguenave Esri Water Resources Team ... View more

Are you filling the reconditioned DEM? If you do, are your burnt in streams allowed to flow outside of the DEM? If they do not, then they will trap the water within the dem, be considered as sinks and filled in. Christine Dartiguenave Esri Water Resources Team ... View more

This issue was fixed in the 2 versions of HEC-GeoHMS posted last Thursday (2/7/2013) on our ftp site. HEC-GeoHMS 10.0.0.118 for ArcGIS 10      10.1.0.27 for  ArcGIS 10.1 Christine Dartiguenave Esri Water Resources Team ... View more

If you are using ArcGIS 10, I would upgrade to Arc Hydro 2.1. Assign UniqueID is still in the ApUtilities menu in versions 2.1 (ArcGIS 10) and 10.1 (ArcGIS 10.1) for sure. We added it to the toolbox but did not remove it from the toolbar. Christine Dartiguenave Esri Water Resources Team ... View more

The Burn Stream Slope function was introduced to enforce the flow direction once the water reaches the stream, to deal with cases where the elevation in the stream (after burning) goes the wrong way. This function modified the elevation so that it decreases along the digitized direction of the streams. The Assign Stream Slope function had to be run first to populate the required elevation fields. These 2 functions have been replaced by the Create Drainage Line Structures/Adjust Flow Direction in Streams function. The first one creates the Stream Flow Direction Grid enforcing the flow direction in the streams and the second one imposes this Stream Flow Direction Grid onto the Flow Direction Grid to create the Stream Adjusted Flow Direction Grid. Christine Dartiguenave Esri Water Resources Team ... View more

The main objective of the AdjointCatchment feature class is to speed up performance for watershed delineation. It does not need to be visible in the map. It represents the aggregated catchments upstream of any given catchment. However, if you to visualize a subset, you could setup a definition query to show only the features meeting your specified criteria (Definition Query tab in the Properties window). Christine Dartiguenave Esri Water Resources Team ... View more

There is one geoprocessing tool in the Arc Hydro Toolbox in the Point Characterization toolset called Generate Flow Path. It takes as input the source points to trace, the flow direction grid as well as the Catchment and Drainage Line feature classes to speed up performance. It generates the flow paths. You may want to check it out. Christine Dartiguenave Esri Water Resources Team ... View more

There was probably a disruption during the transfer to the ftp site. New setups have just been uploaded that should fix this problem. Christine Dartiguenave Esri Water Resources Team ... View more

There was probably a disruption during the transfer to the ftp site. New setups have just been uploaded that should fix this problem. Christine Dartiguenave Esri Water Resources Team ... View more

The interactive flow path tool will create a feature. Christine Dartiguenave Esri Water Resources Team ... View more

You can use the Batch Watershed Delineation for Polygons tool in Arc Hydro. It is available in the Watershed Processing menu and toolset. Christine Dartiguenave Esri Water Resources Team ... View more