The ability of detainment bunds to decrease surface runoff leaving pastoral catchments: Investigating a novel approach to agricultural stormwater management

Levine, Brian; Horne, D. J.; Burkitt, LL; Tanner, Chris C.; Sukias, J.P.S.; Condron, Leo M.; Paterson, John

doi:10.1016/j.agwat.2020.106423

Cited by 9 publications

(15 citation statements)

References 23 publications

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“…The key finding of this 12-month study was that impeding ephemeral stormflows with DBs resulted in the attenuation of 789 and 1280 kg (Levine et al, 2021) demonstrating that load reductions were a result of the DBs' ability to decrease SS concentrations by facilitating sediment deposition, and decreasing the volume of runoff discharged from the DB as a result of soil infiltration observed by Levine et al (2021).…”

Section: Yields and Loadsmentioning

confidence: 78%

“…Despite hundreds of kilogrammes of sediments being deposited in the DB ponding area during the 12‐month study period, and presumably during each of the 6 years since the DBs were constructed, there was no observable build‐up of sediments in the ponding area. Although previously deposited sediments may be remobilised in subsequent ponding events, and soil infiltration rates have been found to be decreasing in the ponding areas (Levine et al, 2021), the finding that DBs reduced annual SS outflow loads by 51 and 59% suggests the monitored DBs will be able to continue to effectively attenuate SS well into the future. However, future sediment deposition and potential adoption of innovations that increase trapping efficiencies could, in turn, decrease yield treatment efficiencies in the long‐term, because of greater quantities of deposited sediments potentially contributing to further decreases in soil infiltration rates and increased sediment remobilisation.…”

Section: Resultsmentioning

confidence: 99%

“…The emergency spillway was breached during the two large Overflow Events that occurred at both sites. Levine et al (2021) describe in detail how emergency spillway discharge volumes were calculated. Briefly, because both the spillway discharge and soil infiltration were unmeasured, the event average soil infiltration rates were calculated for each of the Overflow Events to determine the volume discharged over the spillway for each respective event.…”

Section: Methodsmentioning

confidence: 99%

“…The DBs were constructed on productive pastures downstream of 55 and 20 ha catchments mainly used for pastoral agriculture that both drain to Lake Rotorua. We hypothesized that ponding surface runoff will facilitate sediment deposition and result in lower SS discharge concentrations, which combined with decreased runoff outflows identified by Levine et al (2021), will result in decreased annual SS loads discharged from the DB catchments.…”

Section: Introductionmentioning

confidence: 99%

“…aLevine et al (2021).F I G U R E 2 Cross-section of the ponding area showing the ephemeral stream inflow ponding behind a detainment bund. If the pond height exceeds the height of the upstand riser then 'decanted overflow' is discharged via a pipe passing through the bund.…”

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confidence: 99%

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The ability of detainment bunds to decrease sediments transported from pastoral catchments in surface runoff

Levine

Burkitt

Horne

et al. 2021

Hydrological Processes

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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 À1 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 loworder 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 À1 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 À1 , 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.

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Section: Yields and Loadsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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The ability of detainment bunds to decrease sediments transported from pastoral catchments in surface runoff

Levine

Burkitt

Horne

et al. 2021

Hydrological Processes

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Mitigating floods and attenuating surface runoff with temporary storage areas in headwaters

et al. 2023

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Temporary storage areas (TSAs) represent a category of soft-engineered naturebased solutions that can provide dispersed, small-scale storage throughout a catchment. TSAs store and attenuate surface runoff, providing new additional storage during flood events. The need for such additional catchment storage will become more urgent as the frequency and magnitude of extreme hydrological events increases due to climate change. Implementation of TSAs in headwater catchments is slowly gaining momentum, but practitioners still require further evidence on how such measures function during flood events. This review focuses on the role of relatively small-scale (<10,000 m 3 ) TSAs in headwater catchments for flood risk management. It also explores the potential wider benefits for implementing these as part of an integrated catchment management approach. TSA flood mitigation effectiveness is primarily determined by the TSA's available storage prior to the event. At the local scale, this can be represented by the relationship between TSA inputs, outputs and total storage. Factors influencing the local functioning and effectiveness of TSAs are discussed, with potential considerations for optimizing future TSA design and management. Hydrological models have suggested that TSAs could be used to effectively attenuate high magnitude events. However, future considerations should involve addressing the lack of empirical evidence showing TSA catchment scale effectiveness and how local TSA functioning might change in time. Small-scale headwater TSAs offer a holistic and sustainable approach to catchment management that can deliver both local benefits to landowners and wider flood risk mitigation for society.

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Impact of raised beds on surface runoff and soil loss in Alfisols and Vertisols

Garg

Anantha

Dixit

et al. 2022

CATENA

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The ability of detainment bunds to decrease surface runoff leaving pastoral catchments: Investigating a novel approach to agricultural stormwater management

Cited by 9 publications

References 23 publications

The ability of detainment bunds to decrease sediments transported from pastoral catchments in surface runoff

The ability of detainment bunds to decrease sediments transported from pastoral catchments in surface runoff

Mitigating floods and attenuating surface runoff with temporary storage areas in headwaters

Impact of raised beds on surface runoff and soil loss in Alfisols and Vertisols

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