North Level Commissioners v River Welland Catchment Board The River Welland from Peakirk to Brotherhouse Bar is bounded (a) by a natural bank, within which the water normally flows, (b) by the Cradge Bank, up to which the water flows at spring tides, and (c) beyond the latter bank at a distance varying from fifty yards to three-quarters of a mile by the Barrier Bank, which protects the land beyond it at times of abnormal flooding.