The trade-off between small slots and proper drainage in urban areas
A grate fails hydraulically when water bypass occurs.
Failure to deal with runoff can result in inconveniencing pedestrians to damaging buildings and their contents, disrupt transport systems, interrupt business operations and result in lawsuits associated with injuries to individuals.
A grate’s inlet size has a significant effect on its hydraulic performance and must be considered in real environments particularly when over time grate inlets clog up due to silt and debris. Inlet size however, must be kept to a minimum to stop heels, bicycle and wheelchair wheels; and walking canes from getting caught.