A river now runs through Carolyn O’Connell’s Cedar Grove property thanks to a stormwater drainage system meant to prevent flooding on nearby Route 23. Her backyard is overgrown because holes she said were caused by fast-moving water during storms make it dangerous for her to mow, and she worries that the water is damaging her home’s foundation. According to a lawsuit filed in state Superior Court in Newark by O’Connell’s attorney, Stuart Lieberman, an engineering firm hired by the state Department of Transportation confirmed there was damage to the foundation and erosion on the walls alongside…