Hydraulic (HEC-RAS) model of the Lower San Saba River between Harkeyville and San Saba, TX, USA

This model is a two-dimensional (2D) hydraulic model created in the Hydraulic Engineering Center’s River Analysis System (HEC-RAS). The model was created for a segment of the San Saba River between Harkeyville and San Saba, TX, USA. The model’s geometry is based on United States Geological Survey 3D Elevation Program data collected in 2018, and the channel bathymetry was burned in using cross-sectional data collected by Texas State University researchers in 2018. The model was calibrated using water surface elevation and velocity measurements taken during field data collection., Available data:
Researchers from Texas State University collected depth, flow velocity, and wetted width data at 200 cross-sections spaced approximately 350 ft apart using the equipment listed in Table 1.
Table 1. Equipment used and their accuracy for Texas State University data collection. Table from Harris et al. (2023).

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

Data was collected between June 4th and June 27th, 2018. During this time period, USGS gage 08146000 (San Saba, TX) recorded discharges ranging from 11.9 to 396 cfs, with an average discharge of 20 cfs.
USGS 3DEP 1 m resolution data collected between February 14th and April 22nd, 2018, was used to create the HEC-RAS terrain (Merrick-Surdex 2018)..., , # Hydraulic model (HEC-RAS) of the Lower San Saba River between Harkeyville and San Saba, TX, USA

This hydraulic model was generated in the U.S. Army Corps of Engineers Hydrologic Engineering Center's River Analysis System (HEC-RAS), and consists of a 20 km segment of the lower San Saba River, a tributary of the Colorado River in Texas.

## Software for accessing files

HEC-RAS produces several specialized file types that may require additional software to view and open. Many files are specific to HEC-RAS and may be opened with HEC-RAS v6.2 or later, which can be downloaded for free at https://www.hec.usace.army.mil/software/hec-ras/. Other files may be opened with the following free software:

* HEC-RAS software can be used to open the file types with the following extensions:
* G01
* P01
* U01
* B01
* BCO01
* C01
* DSS
* IC.O01
* PRJ
* RASMAP
* X01
* Shapefiles (.cpg, .dbf, .prj, .sbn, .sbx, .shp, .shx)
* VRT
* RST
* HDF (Hierarchical data format) files: H...