In the tideway the principal affluents of the Thames are the Brent at Brentford, the Wandle at Wandsworth, the Ravensbourne at Deptford, the Lea at Blackwall, the Darent just below Erith, and the Ingrebourne at Rainham, besides the Medway.
It is only since about 1870 that this popularity has grown up. Ten years earlier even rowing-boats were few excepting at Oxford, at Henley in regatta time, and at Putney on the tideway.
The Oxford and Cambridge boat-race from Putney to Mortlake on the tideway, the summer eights and the "torpids" at Oxford University, and the school races at Eton and Radley should also be mentioned.
They are caught with the seine or with the bag-net in the tideway.
The tideway group warned last November that there was currently a 100% chance of sewage overflows in the area between May and October.