HEL Determinations Instructions
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HEL/PHEL DETERMINATION -- GIS TOOL The following tool was developed to facilitate the 1026 determination and documentation process for HEL using GIS. HEL Tool will 1- Summarize HEL for a given tract, field(s). 2- Compute if a field is HEL or NHEL 3- Compute PHEL based on LiDAR derived slope percent and length 4- Output automated 026e and letters Save the Zip to C:\temp\. Unzip directly to C:\ so that you have C:\HEL\ Prior ArcMap Setup Open ArcMap or your County Template. Select >> >> Set Workspace to a local folder such as c:\temp Select Select >> >> >> >> and for the transect tool Turn on Toolbox Right click ArcToolbox Select Add Browse to C:\HEL\ and Select Your toolbox should now have Right click in the Toolbox Area and Save to Default Save your template as well. March 14, 2016 Page 1 of 11 HEL/PHEL DETERMINATION -- GIS TOOL ArcMap Layer Requirements Make sure a CLU; HEL; Soils; and DEM layers are loaded. Zoom to your Tract and select your field(s). Use a Definition Query (optional) for your tract. This also ensures you print FOIA compliant maps. Running HEL Tools Open Model 1. Note: Your State GIS Specialist will have set the correct parameters for your tool. You will get errors If the tool parameters are not set to recognize the fields HEL, T, K, R. March 14, 2016 Page 2 of 11 HEL/PHEL DETERMINATION -- GIS TOOL The 1026 requires a Determination on field 1, 6, 7. Your first output layer will provide total Acres and total Percent for HEL, NHEL or PHEL for each field. In all 3 fields, evaluating PHEL will determine if the field is HEL or NHEL. March 14, 2016 Page 3 of 11 HEL/PHEL DETERMINATION -- GIS TOOL The Second Output provides PHEL mapunit EI determination. The soils that are originally HEL will be all red. Those that were originally NHEL will be all grey. PHEL map units are a combination of HEL/NHEL The Third Output will summarize the PHEL areas that are HEL/NHEL and compute total HEL percent and area for the field. March 14, 2016 Page 4 of 11 HEL/PHEL DETERMINATION -- GIS TOOL Select Ok. There are no variables to change. The Model adds the required information to create the 026e and the letters. MS Access will open. You can also open MS Access from the c:\HEL\ folder manually Start Here March 14, 2016 Page 5 of 11 HEL/PHEL DETERMINATION -- GIS TOOL Enter the Info for the 026e If a field is sodbusted, manually update to Yes The county code will determine the NRCS mailing address in the Footer When you have finished entering data, click the Open CPA-026e button March 14, 2016 Page 6 of 11 HEL/PHEL DETERMINATION -- GIS TOOL March 14, 2016 Page 7 of 11 HEL/PHEL DETERMINATION -- GIS TOOL Use the letter provided by your state, these may differ from this example. HEL PTD Adverse Letter. The checkbox can be checked after printing. All letters use the output from ArcMap to indicate what each field determination is. March 14, 2016 Page 8 of 11 HEL/PHEL DETERMINATION -- GIS TOOL Model 2. The Model will extract from your DEM the slope percent and slope length from a line drawn on the map. It is not linked to any other process, and is for display and reference purpose. For example, if field calculations were requested during the Preliminary appeal process. The Transect could be verified against the LiDAR data. For the purpose of calculating Slope length, a transect can extend beyond a mapunit and beyond a field edge (see policy). The tool will use the frozen T,K,R values from the Soil Mapunit that lies in the Center of the transect in the event a transect would cross multiple mapunits. You can draw as many transects as you wish, and they do not need to be straight. Please provide any changes, improvements to this Tool. Kevin Godsey, Soil Scientist Christiane Roy Missouri NRCS MLRA Soil Survey, Marble office SE MN Regional GIS Specialist PO BOX 199, 406 East Main St. USDA - NRCS Marble Hill, MO 63764 OFFICE 573-741-3033 FAX 855-835-0067 kevin.godsey@mo.usda.gov 1485 Industrial Drive #102, Rochester, MN 555901 :office (507) 405-3580 cell 2256 (507)-951- : christiane.roy@mn.usda.gov March 14, 2016 Page 9 of 11 HEL/PHEL DETERMINATION -- GIS TOOL Appendix 1 This is a snapshot of Policy, Refer to your Policy Shortcut for more detail March 14, 2016 Page 10 of 11 HEL/PHEL DETERMINATION -- GIS TOOL March 14, 2016 Page 11 of 11
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File Type : PDF File Type Extension : pdf MIME Type : application/pdf PDF Version : 1.5 Linearized : Yes Author : Schwieder, Christiane - NRCS, Rochester, MN Company : USDA Create Date : 2018:10:19 10:41:31-05:00 Modify Date : 2018:10:19 10:41:35-05:00 Source Modified : D:20181018160251 Subject : Language : EN-US Tagged PDF : Yes XMP Toolkit : Adobe XMP Core 5.6-c015 84.159810, 2016/09/10-02:41:30 Metadata Date : 2018:10:19 10:41:35-05:00 Creator Tool : Acrobat PDFMaker 15 for Word Document ID : uuid:23335d2d-d14c-4009-b37e-40f19a3abdf0 Instance ID : uuid:2bfd5f0d-3c18-47f2-8f7e-cfd0c4b081de Format : application/pdf Title : Description : Creator : Schwieder, Christiane - NRCS, Rochester, MN Producer : Adobe PDF Library 15.0 Keywords : Page Layout : OneColumn Page Count : 11EXIF Metadata provided by EXIF.tools