When you see a manhole gushing, how do you estimate the size of the overflow? The Southern Section Collection Systems Committee, a part of the California Water Environment Federation, is offering collection system operators in that state a simple visual tool for estimating (see photos).
These handy rulers picture manhole overflows gauged at various flow rates in gallons per minute (gpm). The intent is to help collection personnel accurately determine the severity of overflows they encounter in the field.
For years, says SSCSC representative Jim Aanderud, collection personnel have been using pictures from overflow simulations taken 12 to 15 years ago. “For
