(another) raw sewage overflow alert

You know the drill.  Stay out of the Indianapolis waterways cause there be poop in them. This is somewhat strange as I checked how much precipitation we’ve experienced recently and our  accumulated precipitation, month to date for 2/10/09 (the day of the alert), was only .24 inches.  Hardly seems like enough precipitation to enable a sewage overflow.  I know we’ve had a lot of snow melting, but it was gone before last weekend.  Something doesn’t seem right.