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McCarthy Run is a sub-watershed of Stoney Run. It is in White Township, to the west of Indiana Borough in Indiana, Pennsylvania. The watershed area covers 4.4 square miles with many houses, shopping centers, restaurants, and grassy recreation areas. Intense storms result in localized flooding. Current flood remediation efforts have focused on increasing retention volumes. Quantifying the volume of water that is supplied to the stream by direct surface runoff vs. stormwater infrastructure (piped) delivery for each of the small first order streams will allow for a better understanding of the mainstem of McCarthy Run. This can help the community prepare for the expected change in storm intensity predicted in the future (USGCRP, 2018).