Latest Contributions by PeterWilson

I've derived a 3D river centreline from my DEM and have increase the elevation for each vertex by 3m, simulating a flood. I've tried generating automated cross sections based on the 3D river centreline, but the placement of the cross sections start crossing each other with different elevation levels. If anyone has a way to generate a surface (TIN\DEM) that I then can use to subtract from the ground surface (DEM) to estimate the floodplain based on the increased elevation along the river centreline. Any assistance will be apprecaited as I've been struggling with this for the past few days, looking for alternative methodologies to accomplish the following. Regards Peter Wilson ... View more

Dear ESRI community I'm currently trying to generate cross sections along a river centerline at specified locations (i.e. either point features or x;y locations). I'm trying to roughly determine the floodplain for a river section based on an expected increase in elevation at the river centerline. I'm looking to take the current elevation of the river centerline and increase it by firstly 3m and then by 5m to determine the impacted area for each level. What I've done so far is use HEC-GeoRAS to generate the cross-sections automatically based on a specified distance and cross-section length. The problem with the current method is that the positions are then not necessarily going through the raster cell centers. This then causes an interpolation between the surrounding cells and makes it difficult to identify the flood extent levels when the flooded level is say 13m and the identified location of the same level for the left and right bank can be determined by identifying either subracting the flood level and identifying where the value is equal to 0. What I'm trying to figure out is a way to automatically generate cross sections along a river centerline at specified locations which will ensure that the generated cross sections pass through the center of the raster cell and make it a lot easier to identify the left and right bank extents of the proposed floodline. Regards CrossSection01 = Current Cross Section Positions CrossSection02 = Prefered Cross Section Postions ... View more

Dear ESRI community I came accross the following blog post: Floodplain delineation using only Arc Hydro models | ArcGIS Blog I've emailed the Arc Hydro Team and Dean informed me that he is currently busy compiling a document to explain the steps and structure (File Geodatabase) to achieve the following. I'm currently busy with a project where I'd like to apply the following and hope that someone within the ESRI community has implemented the following and would be able to assist me to determine the floodplain based on a generated gauge height to see what the expected floodplain would be. I'd like to set the gauage height to 3m and then 5m above ground level and then determine the floodplain for each. I've attached my current File Geodatabase with the Feature Classes, including the time series tables with relevant relationship classes and domains. Regards Peter Wilson ... View more

Dear ESRI community I came accross trhe following blog post: Floodplain delineation using only Arc Hydro models | ArcGIS Blog I've emailed the Arc Hydro Team and Dean informed me that he is currently busy compiling a document to explain the steps and structure (File Geodatababase) to achive the following. I'm currently busy with a project where I'd like to apply the following and hope that someone within the ESRI community has implemented the following and could be able to assist me to determine the floodplain based on a generated gauge height to see what the expected floodplain would be. I'd like to set the gauge height to 3m and then 5m above ground level an then determine the floodplain for each. I've attached my current File Geodatabase with the Feature Classes, including the time series tables with relevant relationship classes and domains. Regards Peter Wilson ... View more

Dear ESRI community I'm busy implementing the Arc Hydro Geodatabase XML schema and have come across a problem that I need assistance with. The Arc Hydro Data Model has been saved as a XML Schema. I have imported it into a newly generated File Geodatabase and then defined the local projection based on my study area. The problem that I have is that the Domain, Resolution and Tolerance is not being updated and when I try to add features through an edit session I receive the following error message. "The Create Feature task could not be completed. The coordinates or measures are out of bounds" Any assistance to import the following schema and set the projection which will update the Domain, Resolution and Tolerance will be appreciated. Regards Peter Wilson ... View more

Dear Arc Hydro Community   I'm looking for help in order to reproduce the steps given in the following blog: Floodplain Delineation using only Arc Hydro Models The blog doesn't specify the structure of the input data or if a Arc Hydro Geodatabase (with schema) is required to achieve the following.   I'm currently busy with a floodplain study (Zitundo) and I'd like to generate a floodplain using the above example based on a 3m and 5m rise just before the lake within my study area. if anyone could assist me to understand the structure required for the input dataset and file geodatabase, it will truly be appreciated.   I've used Arc Hydro so far to generate the following hydrological characteristics:   Upstream Catchment River Slopes (10/85 and equal area slope) Longest Water Course Centroidal Longest Flow Path Average Catchment Slope   Regards ... View more