Functions to connect the widely used Storm Water Management Model (SWMM) of the United States Environmental Protection Agency (US EPA) to R with currently two main goals: (1) Run a SWMM simulation from R and (2) provide fast access to simulation results, i.e. SWMM‘s binary ‘.out’-files. High performance is achieved with help of Rcpp. Additionally, reading SWMM‘s ‘.inp’ and ‘.rpt’ files is supported to glance model structures and to get direct access to simulation summaries.