Charges are calculated using property size (A), development intensity (I), and a runoff coefficient (R), based on land zoning and a city-wide monthly rate.
The charges are calculated as follows:
A x I x R x Rate = Stormwater utility charge
A: The area of the property in square metres (m2), and the proportion of the building lot area attributable to each unit for multiple units sharing a single building of property.
I: The development intensity factor of 1.0, except for properties where owners demonstrate that they contribute significantly less stormwater runoff per property area to the City's land drainage system during rainfalls than other similarly-zoned properties.
R: The runoff coefficient, which is based on land zoning.
Rate: The monthly charge of $0.040649 per square metre (m2).