Designing and sizing Low Impact Development (LID) stormwater devices to accommodate real world events and shifting hydrologic regimes can be a challenge. There is often much uncertainty regarding how a LID system will perform over time in terms of water balance, flooding, soil moisture, and clogging. Recent improvements in hydrologic models such as SWMM have attempted to address some of these challenges. SWMM is a widely-used open source, dynamic rainfall-runoffrouting simulation model capable of simulating the physical processes occurring in the individual layers of LID controls.