Peak Discharge: SCS Peak Discharge Method

The dialog box for the SCS peak discharge method is shown below.

· Input for the SCS peak discharge method:

· Unit System – English or SI unit.

· Solving Target – Peak discharge or time of concentration.

· Equations – Rational method or the SCS peak discharge method.

· SCS Rainfall Type – Select one of the SCS rainfall types (i.e., Types I, IA, II, or III)

· Curve Number – SCS’s dimensionless number that is used as a measure of runoff generation capability of a watershed (see Table 3.12). It is a function of soil, land cover and treatment.

· Rainfall Depth – 24-hr cumulative design rainfall depth. This rainfall depth will be distributed across the 24-hr duration according to the SCS rainfall type selected.

· Drainage Area – Area of the total watershed that drains to the location where the peaks flow is determined.

· Output for the SCS peak discharge method:

· Peak Discharge – Peak flow generated from the watershed.

Source: http://www.slideshare.net/damonweiss/workshop-on-storm-water-modeling-approaches