The Dual Drainage Storm Water Management
Model (DDSWMM) is a comprehensive model which can be used either for the
design of new urban drainage systems or the evaluation of existing ones.
It represents a new generation of its predecessor, OTTSWMM
which has been widely used in Canada since
the mid-1980's. It has also been in use in the U.S., Europe and South America.
DDSWMM represents a complete overhaul of OTTSWMM. It was first released
in March 1996, and has undergone many improvements in the current release
DDSWMM is a fairly flexible and
user-friendly model which can be applied for separate or combined sewage
systems under many largely varying flow conditions, from the extreme 1:100
year storms and larger, to the common design storms involved with the common
design of urban drainage systems. It is fully compatible with the various
versions of the EXTRAN model. DDSWMM is accompanied with a detailed reference
manual which explains both the theoretical formulation and the practical
application of the model, with detailed input data description and examples.