Name: Rockfall Susceptibility Area

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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., and Skyline Geoscience. Datasets used to assemble this dataset:HAZARD_ROCKFALL_INITIATIONZONES. Source: Skyline Geoscience, July M Frazier, P.G.; Cesare, Inc., K. Craig Vaughn, P.E.; Geologic Hazard Datasets, 2019 Revisions, Project No. 16.3097; May 9, 2019.HAZARD_ROCKFALL_PROCESSAREAS. Source: Skyline Geoscience, July M. Frazier, P.G.; Cesare, Inc., K. Craig Vaughn, P.E.; Geologic Hazard Datasets, 2019 Revisions, Project No. 16.3097; May 9, 2019.The following are the steps used to create the layer:The following layers from Cesare, Inc. 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 LocationRockfall Source ZonesCesare 2019Figure 5, Letter May 9, 2019.Previously shown on Plate 9, 2017 Addendum.\prjlu\2019\GeohazardDatasets_GIS-19-0042\Rockfall.2019\Rockfall.Init.2019.shpHAZARD_ROCKFALL_INITIATIONZONESRockfall Process AreasCesare 2019Figure 5, Letter May 9, 2019.\prjlu\2019\GeohazardDatasets_GIS-19-0042\Rockfall.2019\Rockfall.Process.2019.shpHAZARD_ROCKFALL_PROCESSAREASA 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 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.

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