The outflow from the first reservoir is divided into two separate flows (Q1 and Q2) where Q1 represents the fast flow which is triggered after a certain threshold L to be defined by the user and Q2 the intermediate flow.
The discharge from the initial tank is split into two distinct streams (Q1 and Q2), where Q1 denotes the rapid flow initiated after a predetermined threshold L, set by the user, whereas Q2 represents the intermediate flow.