This section of Rainbow Avenue has a infiltration system to handle storm water. This is a very effective and environmentally safe method to return the rainwater to the groundwater table. City staff will investigate the pipe system and storm grates for any blockages. It is common that the storm sewer grates get sealed over with lawn clippings, leave sand debris preventing the storm water from reaching the pipe system. Most likely the cause of the flooding is due to the amount of rain (2”+) received in such a short timeframe. Infiltration systems can become overwhelmed during heavy rainfalls and drainage systems in Portage, typically, are not designed to take in water at such a high rate of volume. Usually within a few hours the flooding subsides. If you wish to discuss this further, please do not hesitate to contact the Transportation & Utilities Department at 329-4422..