SWMM is widely used throughout the world and is considered the "gold standard" in the design of urban wet-weather flow pollution abatement approaches. It is a dynamic hydrology-hydraulic water quality simulation model used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas and allows users to include any combination of low impact development (LID)/green infrastructure controls to determine their effectiveness in managing stormwater and sewer overflows. SWMM-CAT is an easy to use add-on that applies monthly climate adjustment factors onto historical precipitation and temperature data to consider potential impacts of future climate on stormwater.
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