The area since before 1900 has nothing more than a non-raised culverted small ditch invisibly separating it from the rest of the industrial estate to the east and forms a slight depression relative to the bank at only 2m AOD however was a more well-defined island at high tide at the mouth of the River Ingrebourne, that rises in Essex as the Weald Brook.[1]
Uses
The mechanical biological treatment works of the East London Waste Authority, sited here, turns 50% of processed waste into refuse-derived fuel, and recovers metals and glass.[2][3]
Frog Island is located at the mouth of Rainham Creek where the River Ingrebourne discharges into the River Thames through a culvert and tidal sluice.[4]