I worked with Ryan Neuman of the TTF Watershed organization to install some water level loggers in a large infiltration chamber recently installed in Alverthorpe Park in Abington. (That’s Tookany-Tacony-Frankford watershed, a stream that changes names twice along its flowpath.) We attached the logger to a stake and lowered it down the port. Ryan is walking to the far end of the chamber in the second photo — this is a big storage chamber! The township wondered how often the chamber overflows.
Gaging by the large rain event on Sept 10 (an inch and a half an hour at one point), this chamber is not going to overflow! The orange and blue lines don’t rise above background for this monitoring period in August and September. The background is negative because the barometric correction is a little distance away.