The Thames is some 205 miles (330 km) long, running 140 miles (226 km) from the s.... cubic feet

The average flow at the upper limit of the tideway, at Teddington, is 1,856 cubic feet (53 cubic metres) per second, rising to 4,640 cubic feet (130 cubic metres) per second after winter rain. In extreme floods (e.g., March 1947) the discharge at Teddington Weir may be as much as 20,900 cubic feet (590 cubic metres) per second. Reputedly, an average of 31,310 cubic feet (887 cubic metres) per second passed over it one day after heavy storms in 1894. cubic feet