How to import Soils Data

Pubblicato il 29 ottobre 2025 alle ore 17:34

RAS MAPPER | Map Layer | Right click: Create a New RAS Layer | Soils Layer

  1. Choose the Soils Data shapefile that includes the Hydrologic Soil Group (HSG) classifications, such as A, B, C, D, A/D, and more.

  2. Select the field name that provides a unique name convention for the soils layer, such as "Hydrologic Group" or "Texture Class".
    In this example, the field name is "HSG". 

  3. Unique Classification Names for Selected Files: The HSG Filed must not have the "/" character as it is not supported.
    For example, values such as A/D, B/D, and C/D should be updated to AD, BD, and CD, respectively. (Follow this tutorial to fix it).

  4. Cell Size: Ensure it matches the cell size of the Land Cover raster for consistency.

Do the Land Cover and Soils Data rasters need to have the same cell size in HEC-RAS?

When HEC-RAS computes infiltration (for example, using methods like Green & Ampt or Curve Number), it combines the values from two rasters:

  • Land Cover (LULC) → used to assign the land use type;

  • Soils Data → used to assign the soil type (HSG).

The software matches the values cell by cell between the two rasters.
If they have different resolutions (cell sizes), the cells will not line up spatially, and HEC-RAS will need to interpolate or resample one of the rasters, which can introduce errors or misalignments.

In the RAS-MAPPER's map window, you will find the newly created Soils raster.

POTENTIAL ERRORS YOU MIGHT ENCOUNTER

The presence of the "/" within your Classification values.

A pop-up message will appear if the Classification values contain the "/" character, alerting you to the issue:

To resolve this issue, open ArcGIS Pro and update the HSG Field in the attribute table. Use the Field Calculator tool along with a Python script to remove the "/" character by replacing it with an empty string.

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