sentences:  The New Zealand Ministry for Culture and Heritage gives a translation of "native broom stream" for "Mangatainoka".Prior to European settlement of New Zealand, the shallow river was thickly lined with matai, rimu, and totara trees that prevented serious flooding to the swampy lands alongside the river.However, large-scale removal of the forest and drainage of the fertile land for agriculture has caused the river to flow faster, deepening its channel, heightening erosion, and encouraging it to meander to try to return to its slower pace.