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Description: The intended use of these geologic hazard datasets is that they will be considered as regional geologic hazard tools integrated into standard workflows by Boulder County land use, development review, transportation and other departments to provide guidance for future site specific geologic and geotechnical studies for proposed development and improvements. These datasets are not intended to replace site specific geologic hazard information, nor do they assign a level of risk. Susceptibility indicates that an area has the potential for a geologic hazard. Susceptibility Is derived by using the characteristics of areas with known geologic hazards to find other areas with similar conditions which may also be susceptible. An area identified to be susceptible does not indicate that a certain geologic hazard will occur in that area. Due to the scale of the geologic maps used, the limitations of the modeling methodologies employed, and the manual editing over a large countywide area, there may be areas outside the limits identified in these datasets which have geologic hazard susceptibility.The interpretation of these geologic hazard datasets should be given to geologists and geotechnical engineers with the qualifying experience and certification to make such determinations and site specific characterizations.Information compiled from Cesare, Inc., Skyline Geoscience, and Colorado Geologic Survey. Datasets used to assemble this dataset:HAZARD_DEBRISFLOW_INITIATIONZONES. Source: Skyline Geoscience, Julia M. Frazier, P.G.; Cesare, Inc., K. Craig Vaughn, P.E.; Geologic Hazard Datasets, 2019 Revisions, Project No. 16.3097; May 9, 2019.HAZARD_DEBRISFLOW_PROCESSAREAS. Source: Skyline Geoscience, Julia M. Frazier, P.G.; Cesare, Inc., K. Craig Vaughn, P.E.; Geologic Hazard Datasets, 2019 Revisions, Project No. 16.3097; May 9, 2019.HAZARD_GOLDRUN_SUSCEPTIBLEAREA_ON. Source: Colorado Geological Survey, Kevin M. McCoy; Transmittal Information for Draft Maps Debris Flow Susceptibility Mapping in the Gold Run and Ingram Gulch Areas, Boulder County, Colorado; November 30, 2016.HAZARD_GOLDRUN_SUSCEPTIBLEAREA_OFF. Source: Colorado Geological Survey, Kevin M. McCoy; Transmittal Information for Draft Maps Debris Flow Susceptibility Mapping in the Gold Run and Ingram Gulch Areas, Boulder County, Colorado; November 30, 2016.HAZARD_GOLDRUN_INGRAMGULCH_ON. Source: Colorado Geological Survey, Kevin M. McCoy; Transmittal Information for Draft Maps Debris Flow Susceptibility Mapping in the Gold Run and Ingram Gulch Areas, Boulder County, Colorado; November 30, 2016.HAZARD_GOLDRUN_ INGRAMGULCH _OFF. Source: Colorado Geological Survey, Kevin M. McCoy; Transmittal Information for Draft Maps Debris Flow Susceptibility Mapping in the Gold Run and Ingram Gulch Areas, Boulder County, Colorado; November 30, 2016.HAZARD_DEBRISFLOW_SUSCEPTIBILITY. Source: Colorado Geological Survey, Matthew L. Morgan, Jonathan L. White, F. Scot Fitzgerald, Karen A. Berry and Karen A. Morgan; Foothill and Mountainous Regions in Boulder County That May Be Susceptible to Landslides, Earth and Debris/Mud Flows; May, 2, 2014.The following are the steps used to create the Debris Flow Susceptibility Area BCCP Geologic Hazard layer:The following layers from Cesare, Inc. and the Colorado Geologic Survey were merged together. By using merge, if any of the layers were present, that area was included. For example, if there were two overlapping circles, the entirety of both circles was included, not just the part that was over lapped by both circles.NameSource & DateMore InformationData LocationDebris Flow Initiation ZonesCesare 2019Figure 4, Letter May 9, 2019.Previously shown on Plate 9, 2017 Addendum. \prjlu\2019\GeohazardDatasets_GIS-19-0042\DebrisFlow.2019\DebrisFlow.Init.2019.shpHAZARD_DEBRISFLOW_INITIATIONZONESDebris Flow Process Areas Cesare 2019Figure 4, Letter May 9, 2019.\prjlu\2019\GeohazardDatasets_GIS-19-0042\DebrisFlow.2019\DebrisFlow.Process.2019.shpHAZARD_DEBRISFLOW_PROCESSAREASGold Run On/Off Susceptible AreasCGS 2016Plate 7, Report Nov. 30, 2016.Show as addition to Debris Flow Initiation Areas. Both On/Off.\prjlu\2019\GeohazardDatasets_GIS-19-0042\IngramGulch\Final\IngramGulch_Runout_Shapes\IngramGulch_Runout_Shapes\GoldRun_OnNetwork_SusceptibleAreas.shpHAZARD_GOLDRUN_SUSCEPTIBLEAREA_ONHAZARD_GOLDRUN_SUSCEPTIBLEAREA_OFFIngram Gulch On/Off Susceptible AreasCGS 2016Plate 8, Report Nov. 30, 2016.Show as addition to Debris Flow Initiation Areas. Both On/Off.\prjlu\2019\GeohazardDatasets_GIS-19-0042\IngramGulch\Final\IngramGulch_Runout_Shapes\IngramGulch_Runout_Shapes\IngramGulch_OnNetwork_SusceptibleAreas.shpHAZARD_GOLDRUN_INGRAMGULCH_ONHAZARD_GOLDRUN_ INGRAMGULCH _OFFDebris Flow SusceptibilityCGS 2014Report May 2, 2014.Includes both source and run out zones.\gislu\Environmental\Boulder_Hazards\Boulder_Hazards.shpHAZARD_DEBRISFLOW_SUSCEPTIBILITYA GIS Dissolve operation was then run on the layer. This completed the merge so that individual features from each layer are no longer present. A GIS Buffer operation was run using a distance of 1 foot. Since the Cesare data was derived from high resolution raster data, the layer has a pixelated appearance. The buffer operation assists to connects the features (cells) that only touch on a corner. This assists greatly with the next steps.A GIS Dissolve operation was then run again to merge the features together. Isolated, single 20x20 foot cells were removed.A GIS Smooth Polygon operation was then run, using a tolerance of 40 feet. This distance was choice since it twice the width of a cell. This operation just smooths out the corners of the features.The data was then projected to Colorado State Plane North Feet, WKID 2876 This process results in a single debris flow susceptibility layer that is in cartographically appealing and maintains the positional accuracy of the underlaying data. See "V:\prjlu\2019\GeologicHazardBCCPMap_GIS-19-0100\README Geologic Hazard Data Sources and Processing.docx" for more information on how this dataset was created.

Copyright Text: Boulder County Community Planning & Permitting

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