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- W3186627201 abstract "Abstract Erosion leading to sedimentation in surface water may disrupt aquatic habitats and deliver sediment‐bound nutrients that contribute to eutrophication. Land use changes causing loss of native vegetation have accelerated already naturally high erosion rates in New Zealand and increased sedimentation in streams and lakes. Sediment‐bound phosphorus (P) makes up 71–79% of the 17–19 t P y −1 delivered from anthropogenic sources to Lake Rotorua in New Zealand. Detainment bunds (DBs) were first implemented in the Lake Rotorua catchment in 2010 as a strategy to address P losses from pastoral agriculture. The bunds are 1.5–2 m high earthen stormwater retention structures constructed across the flow path of targeted low‐order ephemeral streams with the purpose of temporarily ponding runoff on productive pastures. The current DB design protocol recommends a minimum pond volume of 120 m 3 ha −1 of contributing catchment with a maximum pond storage capacity of 10 000 m 3 . No previous study has investigated the ability of DBs to decrease annual suspended sediment (SS) loads leaving pastoral catchments. Annual SS yields delivered to two DBs with 20 ha and 55 ha catchments were 109 and 28 kg SS ha −1 , respectively, during this 12‐month study. The DBs retained 1280 kg (59%) and 789 kg (51%) of annual SS loads delivered from the catchments as a result of the bunds' ability to impede stormflow and facilitate soil infiltration and sediment deposition. The results of this study highlight the ability of DBs to decrease SS loads transported from pastures in surface runoff, even during large storm events, and suggests DBs are able to reduce P loading in Lake Rotorua." @default.
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- W3186627201 date "2021-08-01" @default.
- W3186627201 modified "2023-10-17" @default.
- W3186627201 title "The ability of detainment bunds to decrease sediments transported from pastoral catchments in surface runoff" @default.
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- W3186627201 doi "https://doi.org/10.1002/hyp.14309" @default.
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