Causeway Flow
Commercial
Storm and foul water drainage design and 1D hydraulic modelling software for UK and Irish civil engineers.
6 tools · Topic
SuDS / LID / WSUD Design Tools
Green infrastructure design — bioretention, permeable pavement, swales, rain gardens — comes with its own sizing rules and performance models. Indexed here: LID modules in mainstream models, dedicated SuDS sizing tools and the guidance-linked calculators reviewers recognise.
EPA National Stormwater Calculator
Gov-Public
EPA's free tool for estimating site runoff reduction from green infrastructure, with climate scenarios.
EPA SWMM
Gov-PublicVerified
The public-domain engine of urban drainage: dynamic-wave pipe networks, runoff, LID and water quality.
MUSIC
Commercial
eWater's stormwater-quality model — the WSUD assessment standard across Australian councils.
Virginia DEQ's official Excel workbooks for stormwater compliance via the Runoff Reduction Method.
Visual OTTHYMO
Commercial
Hydrologic modeling software for urban and rural stormwater management, master drainage planning, and pond design.