Calculate Reach Potential Q
Description
Calculates potential discharge Q at each stage in the reach characteristics table based on reach’s slope (S0) and Manning;s N (ManningN) using normal depth calculations and Manning’s equation for calculating velocity based on cross-section properties. Results are stored in the “Q” field in the input reach characteristics table (will be created by the tool). Input reach feature class must have these fields populated:
- HydroID – unique reach identifier.
- S0 – longitudinal slope for the reach (dimensionless) - default of 0.0015.
- ManningN – average roughness coefficient for the reach - default of 0.045.
Corresponding reach characteristics table must have these fields populated:
- XID – HydroID of the source cross-section.
- RID – HydroID of the source cross-section.
- H – depth.
- A – area.
- R – hydraulic radius.
Field Q will be created if it does not exist (otherwise it will be overwritten).
Compute Q on each reach property table. Requires: 1. Reaches with HydroID, ManningN, S0 fields. 2. pfTable with: RID (=> HydroID of Reach) XID (=> HYDROID of Reach) A R Q (will be created if it does not exist or overwritten)
Usage
Parameters
| Parameter Name | Type | Direction | Data Type | Dialog Reference |
|---|---|---|---|---|
| Input Drainage Line Feature Class | Required | Input | Feature Layer | . |
| Input Reach Characteristics Table | Required | Input | Table View |