Assessing the role of location and scale of Nature Based Solutions for the enhancement of low flows

Fennell, Jessica; Wilkinson, Mark E.; Daalmans, Ronald; Geris, Josie

doi:10.1080/15715124.2022.2092490

Cited by 9 publications

(22 citation statements)

References 105 publications

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“…2a,b). It is in many ways typical for rural uplands in the Scottish Highlands, and a full detailed description can be found in Fennell et al [23,38]. Briefly, the catchment is north-facing, has a mean elevation of 438 m.a.s.l.…”

Section: Study Sitementioning

confidence: 99%

“…Considering the effects of NBS through different hydro-climatic conditions is important, as an appropriate design could simultaneously address multiple water resources challenges [21][22][23]. Despite developments in the last two decades, knowledge on NBS functioning in temperate upland headwaters has predominantly been gained for flood mitigation [11,24].…”

Section: Introductionmentioning

confidence: 99%

“…Few studies show direct comparisons between different types of NBS, and for a specific type, how NBS design relates to effectiveness through both high and low flows. The specific design, including location and scale of NBS, is key to successful implementation [23,[29][30][31]. Location-specific factors such as their position, associated land use, soils and geology affect the interception of flow pathways, potential infiltration and recharge [22,32,33], whilst the affected area, size, volume or density of NBS affect the mitigation potential for different scales of events [34].…”

Section: Introductionmentioning

confidence: 99%

“…These measures target flood level flows and include measures such as Leaky Barriers [21,37]. If in suitable locations, increased infiltration to recharge groundwater may improve catchment resilience to drought [21,38,39], although there are only a few studies that evaluated effects of RAFs on low flows [21,23,40].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Time variable effectiveness and cost-benefits of different nature-based solution types and design for drought and flood management

Fennell¹,

Soulsby²,

Wilkinson³

et al. 2023

Nature-Based Solutions

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Section: Study Sitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Time variable effectiveness and cost-benefits of different nature-based solution types and design for drought and flood management

Fennell¹,

Soulsby²,

Wilkinson³

et al. 2023

Nature-Based Solutions

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“…The traditional water supply in Morocco suffers from scarcity and irregularity. Water-intensive activities and climate change effects are main factors behind this problem (Fennell et al 2022). As a matter of consequence, we are obliged to find other alternative of water resources which have not yet been put under exploitation e.g.…”

Section: Introductionmentioning

confidence: 99%

Water Quality Modelling of the Sebou River Estuary (Morocco) Before and After the Installation of the Kenitra City’s Wastewater Treatment Plant

Nizar¹,

Igouzal²,

Touazit³

2022

Ecol. Eng. Environ. Technol.

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Urban wastewaters from Kenitra had been discharged without prior treatment through six collectors into the Sebou estuary (60 km) causing in the process health and environmental problems up until WWTP was installed in 2020. The waste water treatment plant (WWTP) had to gather all urban wastewaters in order to go through treatment. Thus, the WWTP, situated 17 km from the mouth of the estuary, has become the only discharge point for treated domestic wastewater into the Sebou estuary. This study aims to model the Sebou estuary water quality and assessment of the impact of WWTP. Our study started with hydraulic modelling of the river using a 1D model (HECRAS 5.0.6), since water quality is strongly depending on hydraulic regime. HEC RAS has been calibrated and validated using hydraulic and morphological database of the years 2019 and 2021. The spatiotemporal evolution of hydraulic variables (water velocity, water level, etc.) was calculated by the hydraulic model and used in the water quality module to simulate the biochemical oxygen demand (BOD 5 ). Two scenarios were put under examination, one is a simulation of discharges of untreated wastewaters by six collectors (mean BOD 5 of 300 mg/L) and the second is a simulation of discharge after treatment at the WWTP (mean BOD5 of 24 mg/L). The simulation showed an impact of the tidal cycle and fresh water flows (coming from the upstream) on the urban wastewater discharges fate. Calculations of the BOD 5 provided by the model are in good agreement with field measurements. The first simulation results show that water quality of the Sebou River does not meet WHO standards (average quality about 7 mg/l of BOD 5 ). The second simulation shows that the treatment plant reduces the concentration of BOD 5 in the river to about 3 mg/l compared to the case before their installation, the quality of the water in the estuary is changing to become good after having been just average. In addition, the BOD 5 concentration downstream of the WWTP changes according to the tidal cycle. Finally, the results show the very positive impact of Kenitra's WWTP on the water quality of the Sebou River estuary.

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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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Assessing the role of location and scale of Nature Based Solutions for the enhancement of low flows

Cited by 9 publications

References 105 publications

Time variable effectiveness and cost-benefits of different nature-based solution types and design for drought and flood management

Time variable effectiveness and cost-benefits of different nature-based solution types and design for drought and flood management

Water Quality Modelling of the Sebou River Estuary (Morocco) Before and After the Installation of the Kenitra City’s Wastewater Treatment Plant

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

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