Neglecting erosion control can be an expensive mistake. That's what Speedway Sand and Gravel discovered after the evening storm of June 21, at their Edgewood Av construction site.
The storm dumped 1.75" of rain--peanuts compared to the 7-10" storms that have occurred in the area.
While this site does have a substantial slope, there is no basin above the site feeding stormwaters onto it. So only water that falls on the site (plus water from one driveway) can erode it.