sentences:  This is where it is assumed that Rochford means ford over the River Roach, so they could have renamed the river to fit the theory.Until the 1900s, Oysters from the River Roach and sometimes from the River Crouch were called Walfleet (or Walflete) Oysters.Which one of the four main streams draining the Rayleigh Hills and entering the Rochford Basin is the Roach is somewhat problematic.