This dataset contains measured and modelled data on the flow-sediment-nutrient interactions in a two-stage (compound) agricultural channel in Sipoo, Finland. The whole dataset is analyzed by Västilä & Jilbert (2024), but parts of the data have been previously described and analyzed by Västilä & Järvelä (2011), Västilä et al. (2016), Västilä & Järvelä (2018) and Västilä et al. (2021). The dataset contains three separate files: 1) repeated elevation surveys of the cross-sectional geometry in six channel cross-sections in years 2010, 2012 and 2019 2) vertical distributions of total phosphorus, nitrogen, carbon and sulphur in the main channel bed, floodplain and channel bank sediments 3) experimentally determined daily average discharges, suspended sediment loads and total phosphorus loads in years 2009-2012, as well as modelled daily average discharges and loads of suspended sediment, total phosphorus, total nitrogen and total organic carbon in years 2009-2019 Brief metadata descriptions (read-me) are included in each Excel file. Further details are described in the original scientific publications listed below. Västilä, K. 2010. Cohesive sediment processes in vegetated flows: preliminary field study results. In Dittrich, A., Koll, Ka., Aberle, J. & Geisenhainer, P. (eds.), Proceedings of River Flow 2010, Fifth International Conference on Fluvial Hydraulics, 8–10 September 2010, Braunschweig, Germany, pp. 317–324. Bundesanstalt für Wasserbau, Karlsruhe. ISBN-13: 978-3939230007. Västilä, K. & Jilbert, T. 2024 Evaluating multiannual sedimentary nutrient retention in agricultural two-stage channels. Scientific Reports, doi: 10.1038/s41598-024-84956-2. Västilä, K. & Järvelä, J. 2011 Environmentally preferable two-stage drainage channels: considerations for cohesive sediments and conveyance. International Journal of River Basin Management, 9(3–4): 171–180. doi: 10.1080/15715124.2011.572888. Västilä, K. & Järvelä, J. 2018 Characterizing natural riparian vegetation for modeling of flow and suspended sediment transport. Journal of Soils and Sediments, 18(10): 3114–3130. doi: 10.1007/s11368-017-1776-3. Västilä, K., Järvelä, J., and Koivusalo, H. 2016 Flow–vegetation–sediment interaction in a cohesive compound channel. Journal of Hydraulic Engineering, 142(1): 04015034. doi:10.1061/(ASCE)HY.1943-7900.0001058. Västilä, K., Väisänen, S., Koskiaho, J., Lehtoranta, V., Karttunen, K., Kuussaari, M., Järvelä, J., Koikkalainen, K. 2021 Agricultural Water Management Using Two-Stage Channels: Performance and Policy Recommendations Based on Northern European Experiences. Sustainability, 13(16), 9349. doi: 10.3390/su13169349

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