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In page Bordesley Green:

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Early maps of the area show a brook which extended from Shaw Hill down to Bordesley Green Road, which is now mostly submerged, with the exception of a small section which emerges from a culvert in Bordesley Green. It is called Washbrook. It’s starts up near garrison lane then flows through the South African Estate, on through the allotments. It is open in Ward End Park then on into the River Tame at Bromford.[1]