QGIS SCS to TUFLOW

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Introduction

This page presents a recommended method for the application of the U.S. Soil Conservation Service (SCS) (now known as the Natural Resources Conservation Service, part of the U.S. Department of Agriculture) rainfall-runoff model. They are based largely on Technical Release No. 55 (TR55) prepared by the U.S. Soil Conservation Service (SCS, 1986).

Available models

Currently, the tool is available for catchments in the Auckland Region¹, however, further models are planned to be added.

Auckland Region

The model is recommended for use in stormwater management design in the Auckland Region. It has been designed as a standard tool that will provide consistent results from different users. Key features of the stormwater runoff model are described below:

• Design 24 hour rainfall depths are provided in the form of rainfall maps covering the Auckland Region.
• A standard 24 hour temporal rainfall pattern, having peak rainfall intensity at midduration. Shorter duration rainfall bursts with a range of durations from 10 minutes to 24 hours are nested within the 24 hour temporal pattern.
• Runoff depth is calculated using SCS rainfall-runoff curves, with curve numbers determined from the SCS guidelines according to classifications assigned to Auckland soil types.

References

¹Auckland Regional Council, April 1999, TP108. Guidelines for stormwater runoff modelling in the Auckland Region.