Discharging the rainwater to municipality facilities.

You can discharge to a municipal facility, so long as you are discharging less than the pre-development condition.

Hi Michael, The credit language says [...] peak discharge rate and quantity from exceeding the predevelopment peak discharge rate and quantity for the 1- and 2-year 24-hour design storms. [...] If we only capture the rainwater into tanks and discharge it into the public sewers after the rainstorm reducing the peak discharge, but do not reduce the amount of waste water not preclude the attendance of the credit?

You need to reduce volume as well. Simply holding back surface runoff and releasing (manually??) after the storm ends will not get you this credit.

Hi, how does this last comment synchronize with statement on top under FAQs: "Is it an acceptable strategy to capture the rainwater into tanks and discharge it into the public sewers after the rainstorm reducing the peak discharge? This is a common strategy for reducing peak rate, which will help you comply with SSc6.1, but you'll need to add onsite reuse or infiltration to meet SSc6.2 requirements." For SSc6.1 we also have to reduce volume in total (during and after stormwater event), right? Response under FAQs sounds as if total volume reduction is only necessary for SSc6.2.

Hi Markus, to comply with the requirements of SSc6.1 you have to reduce the rate and the volume. Harvesting storm water in tanks is a good and typical measure in Germany and often required by the city, but if you release the storm water after the storm event into the public sewerage system you miss the intent of the credit and that will not be accepted by GBCI. To comply with the requirements of SSc6.2 you only have to treat 90% of the average annual rainfall event and remove 80% of TTS. Best regards Markus