ewce09.azraftaohid.me/L4T1/EWCE 462/2026-08-20/CLass notes - 20260820.md

## Water Quality

- Advection
- Diffusion

### Geometry

- Import

### Unsteady Flow

- Use simulation date (default)

### Run Unsteady Flow Simulation

- Check Geometry Preprocessor, Unsteady Flow Simu, Post Processor

### Water Quality Data (On HEC-RAS 5)

- Save
- Add arbitrary constituent with default values
	- Might have been used other options if nutrients
- BC Tracer 1 / Gora A 17
	- Data Source: Constant Value
	- Constant Value: 0
- Initial Conditions
	- Add RS Station Locations to the Table
		- Add all river stations
	- Paste tracer values from provided data
	- FIll with zero for lower rows (drag - similar to Excel)
- Dispersion Coefficients
	- Fixed Dispersion: 0.1

### Run Water Quality Simulation

### View > WQ Spatial Plot

### Change with Lower Dispersion Rate

### Report

- Include 6 screenshots

---

31 Dec 0999
30 Jan 1000

Water Quality

Advection
Diffusion

Geometry

Import

Unsteady Flow

Use simulation date (default)

Run Unsteady Flow Simulation

Check Geometry Preprocessor, Unsteady Flow Simu, Post Processor

Water Quality Data (On HEC-RAS 5)

Save
Add arbitrary constituent with default values
- Might have been used other options if nutrients
BC Tracer 1 / Gora A 17
- Data Source: Constant Value
- Constant Value: 0
Initial Conditions
- Add RS Station Locations to the Table
  - Add all river stations
- Paste tracer values from provided data
- FIll with zero for lower rows (drag - similar to Excel)
Dispersion Coefficients
- Fixed Dispersion: 0.1

Run Water Quality Simulation

View > WQ Spatial Plot

Change with Lower Dispersion Rate

Report

Include 6 screenshots

31 Dec 0999 30 Jan 1000