1.3.1 Upland’s Method - Visual OTTHYMO

With Upland’s Method the average overland flow velocity is determined for a catchment based on the catchment slope and ground type, as shown in the figure below. Once the velocity has been determined then the time of concentration is determined by dividing the catchment length by the overland flow velocity.

UPLANDS METHOD OF ESTIMATING TIME OF CONCENTRATION (SCS NATIONAL ENGINEERING HANDBOOK, 1971)

1.3 Time to Peak Parameter, TP

1.3.2 Bransby – William’s Formula