The RRRP will only be as successful as it can be proven to prevent sewage and stormwater from overflowing into Nine Mile Run. This makes monitoring a critical element of the overall project. In order to monitor the overall project, you must have baseline data or pre-construction data that will provide a clear picture of runoff entering nearby catchbasins. This is then measured against post-construction data. The result is the total number of gallons of runoff removed by the green stormwater infrastructure from the combined sewer system that overflows into the stream.

As a more long-term measurement of the flow within the pipes in the RRRP area, ALCOSAN has installed monitoring equipment nearby the Oakwood-Batavia installation, and at the overflow on Rosedale Street.

Pre-construction Monitoring

Pre-construction monitoring equipment was installed in the fall of 2015. It included Telog© data level loggers at 4 catchbasins at the Oakwood & Batavia Streets intersection, as well as, a single data level logger at the catchbasin at the corner of Bennet & Tokay Streets (Crescent ECC). There was also a Rain Gauge installed on the roof of the Crescent ECC to give an extremely accurate localized data stream of rainfall in the RRRP area. All of the pre-construction monitoring equipment was paid for by PWSA.

Rain gauge on top of Crescent Early Childhood Center in Homewood.

Another angle of the rain gauge on top of Crescent Early Childhood Center.

One of the four data level loggers installed at the Oakwood Batavia site.

Crew installing pre-construction monitoring equipment.

Post-construction Monitoring

All monitoring equipment from the pre-construction phase remains in place and is still in use collecting valuable data. However, now that construction has been completed on several GSI sites, NMRWA has received grants in order to also procure post-construction monitoring equipment. This equipment will monitor the effectiveness of the GSI installations by tracking both the inflow of surface runoff into each system, and the outflow, or overflow of water from the system. This will allow for a much more detailed analysis of the functionality of the facilities and highlight areas for further improvement. NMRWA is currently in the process of acquiring the monitoring equipment, which will be installed by early 2018.