The Combined Sewer Overflow Regulator at the 26th Ward WWTP in Brooklyn collapsed. The estimated flow through this regulator was 85 MGD, with a combined plant capacity of 170 MGD. Local environmental regulations restricted the use of diesel engines to 175 HP or less, and all engine driven equipment was required to be sound attenuated to 50 decibels at 30 feet. The discharge point was the high-level manhole approximately 500 feet away.