Hydraulic model (HEC-RAS) of the Upper San Saba River between Fort McKavett and Menard, TX

This is a 2D Hydraulic model (HEC-RAS) for the Upper San Saba River between Fort McKavett and Menard, TX. Model geometry is based on USGS 3DEP data (2018), with underwater bathymetry “burned” in using cross-sections sampled in the field in 2018. The model was calibrated based on water surface and velocities measured during data collection., The following is a summary of available data utilized for developing a bathymetric terrain for 2D hydraulic modeling using HEC-RAS. Data available for model calibration and validation is also discussed.
Available Data
Cross-section data was collected at approximately 350-foot increments with the following devices:
Table 1. Equipment used and their accuracy for field data collection.

Parameter

Equipment

Unit Accuracy

Location

GPSMap 64 Handheld GPS

10-50 feet

Velocity

Hach Velocity Meter (Model FH950.1)

0.1 feet/second

Depth

An adjustable “ruler” stick with feet as units

0.1 feet

Wetted Width

Laser Technology Inc. TruPulse 360r

3 feet to nonideal (natural) target

The data was collected from July 10 to 26, 2018. The USGS Gage on the San Saba River at Menard, TX (08144500) shows discharges varied from 8 to 18 cfs during the time period.
USGS 3DEP data was used in the HEC-RAS terrain. These data were collected at a 1-meter resolution over a period..., HEC-RAS 6.2 is a free hydraulic analysis software available from US Army Corps of Engineers., # Hydraulic model (HEC-RAS) of the Upper San Saba River between Fort McKavett and Menard, TX

## Description of the data and file structure

Many of the files are specific to HEC-RAS and may be opened with HEC-RAS 6.2 or later version. HDF (Hierarchical data format) are datasets that can be opened with an alternative software such as that provided by https://support.hdfgroup.org/products/java/hdfview/
(Enclosed files listed alphabetically)

* Backup.p01: HEC-RAS-generated backup of the Plan file. This associates inputs with simulation options in HEC-RAS
* IDW\_Terrain.hdf: Contains the terrain used for the simulation, bathymetry was \"burned\" in and computed via Inverse Distance Weighted method described in the attached report.
* IDW\_Terrain.Merge\_Apr15.tiff: Terrain for the simulation in a raster format.
* IDW\_Terrain.vrt: Terrain for the simulation as a GDAL virtual format (vrt) as terrains can sometimes be composed of multiple raster datasets (not in this case).
* Landcover.hdf: Co...