Skip to content

Base Flow Data (*.rib)

Base flow data is used by the baseflow module to estimate base flows at river nodes that do not have hisoric records using the following formula:


\(FlowX\) = Flow at intermediate node to be estimated

\(FlowB\) = Base flow station(s)

\(FlowG\) = Gain flow station(s)

\(pf\) = Proration factor for gain term

\(coefB\) = Base flow coefficient

\(coefG\) = Gain flow coefficient

The first term \((FlowB(1) \times coefB(1) + FlowB(2) \times coefB(2)+ ....)\) typically represents upstream gaged flows. The second term \(pf \times (FlowG(1) \times coefG(1) + FlowG(2) \times coefG(2)+ ....)\) typically represents the gain between gages. This file is read by subroutine VIRGEN.

Row-data Variable Description
Base Station Data
1 Format (a12, 8x, i8, 10(f8.3, 1x, a12)
1-1 FlowN Intermediate river node ID
1-2 mbase Number of base stations to follow
1-3 coefB(1) Base flow coefficient
1-4 FlowB(1) Base station ID
Repeat for the number of gaged flows (mbase)
Proration Data
2 Format (12x, f8.2, i8, 10(f8.3, 1x, a12)
2-1 pf Proration factor for gain term
2-2 nbase Number of gain stations to follow
2-3 coefG(1) Base flow coefficient
2-4 FlowG(1) Base station ID

Repeat for the number of gain stations flows (nbase)

Repeat for the number of intermediate nodes where base flows are to be estimated