Specific Peak Flow Calculator

Runoff Index c*: Time of Concentration tc (hrs): Calculate Specific Peak Flow q*: Generate Plot

Specific Peak Flow (q*) is a measure of peak discharge per unit area of the watershed. It is calculated using runoff index (c*) and time of concentration (tc). Enter the values above to calculate q*.

Refer to TP 108 Guidelines for stormwater runoff modelling in the Auckland Region