calc_WLA {reasonabletools}

Compute Wasteload Allocation

Description

Compute the wasteload allocation (WLA) used for effluent limit calculation.

Usage

calc_WLA(criteria, background, Qrsw, Qeff)

Arguments

criteria

Limiting water quality criterion. Must be in same units as background argument.

background

Background pollutant concentration. Must be in same units as criteria argument.

Qrsw

Upstream limiting/design receiving water flowrate. Must be in same units as Qeff argument. Flow arguments may be entered in ratio form.

Qeff

Effluent limiting/design flowrate. Must be in same units as Qrsw argument. Flow arguments may be entered in ratio form.

Value

WLA as numeric value in same units as criteria and background.

Examples

# WLA for pollutant with 2 ug/L acute criteria and upstream receiving water concentration 
# of 0.1 ug/L. The critical flows are 3 MGD (1Q10) and 0.5 MGD (max daily flow).
calc_WLA(2, 0.1, 3, 0.5) 

# When using dilution credits, put Qrsw and Qeff in terms of the dilution ratio (D).
D = 7   # Assume a jurisdiction that uses D = (Qrsw + Qeff) / Qeff
Qeff = 1 # Equal to 1 since its the denominator of the ratio, or you can use the critical flow
Qrsw = D - 1 # Same as the expression (D * Qeff) - Qeff
calc_WLA(2, 0.1, Qrsw = D - 1, Qeff = 1)