Gullies supply most sediment to major East Coast river systems

Marden, Mike
August 2009
New Zealand Tree Grower;Aug2009, Vol. 30 Issue 3, p28
The article offers information on the contribution of gully systems to the sediment load that reaches the major East river systems in New Zealand which include Waipaoa, Waiapu, and Uawa. A mapping was developed to measure the sediments generated by a gully. Based on aerial photographs in 1997, it was revealed that 1,300 gullies need treatment. Five-hundred of them were already reforested. According to the author, the gullies generate 17 million tonnes of sediment each year. To reduce sediment production, replanting the gullies is needed.


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