Agricultural water management using two-stage channels : Performance and policy recommendations based on Northern European experiences

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Västilä, K.; Väisänen, S.; Koskiaho, J.; Lehtoranta, V.; Karttunen, K.; Kuussaari, M.; Järvelä, J.; Koikkalainen, K. Agricultural Water Management Using Two-Stage Channels: Performance and Policy Recommendations Based on Northern European Experiences. Sustainability 2021, 13, 9349. https://doi.org/10.3390/su13169349

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Title: Agricultural water management using two-stage channels : Performance and policy recommendations based on Northern European experiences
Author: Västilä, Kaisa; Väisänen, Sari; Koskiaho, Jari; Lehtoranta, Virpi; Karttunen, Krister; Kuussaari, Mikko; Järvelä, Juha; Koikkalainen, Kauko
Publisher: MDPI
Date: 2021
Language: en
Belongs to series: Sustainability 13, 16
ISSN: 2071-1050
DOI: https://doi.org/10.3390/su13169349
URI: http://hdl.handle.net/10138/334422
Abstract: Conventional dredging of ditches and streams to ensure agricultural drainage and flood mitigation can have severe environmental impacts. The aim of this paper is to investigate the potential benefits of an alternative, nature-based two-stage channel (TSC) design with floodplains excavated along the main channel. Through a literature survey, investigations at Finnish field sites and expert interviews, we assessed the performance, costs, and monetary environmental benefits of TSCs in comparison to conventional dredging, as well as the bottlenecks in their financing and governance. We found evidence supporting the expected longer-term functioning of drainage as well as larger plant and fish biodiversity in TSCs compared to conventional dredging. The TSC design likely improves water quality since the floodplains retain suspended sediment and phosphorus and remove nitrogen. In the investigated case, the additional value of phosphorus retention and conservation of protected species through the TSC design was 2.4 times higher than the total costs. We demonstrate how TSCs can be made eligible for the obligatory vegetated riparian buffer of the European Union agri-environmental subsidy scheme (CAP-AES) by optimising their spatial application with respect to other buffer measures, and recommend to publicly finance their additional costs compared to conventional dredging at priority sites. Further studies on biodiversity impacts and long-term performance of two-stage channels are required.
Subject: two-stage channels
biodiversity
phosphorus
suspended sediment
water quality
drainage
agricultural water management
flood management
vegetation
CAP-AES
Finland
Subject (ysa): sedimentit
fosfori
typpi
ruoppaus
tulvat
vedenkäsittely
kuivaus
kustannukset
tehokkuus
suositukset
maatalous
biodiversiteetti
menetelmät
vertailu
Suomi
Rights: CC BY 4.0


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