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In this study, we used routine baseflow monitoring and intensive storm sampling at a ditch\u2010drained site on Maryland's Lower Eastern Shore (July 2017\u2013September 2018) to assess whether concentration\u2013discharge (C\u2010Q) relationships and chemical and isotopic hydrograph separation could provide insight into the processes that mobilize and transport dissolved P in ditch drainage. Using a segmented regression model, we determined that long\u2010term C\u2010Q relationships for dissolved P differed above and below a discharge threshold of 6.4 L s<jats:sup>\u20131<\/jats:sup>. Intensive storm sampling revealed that small storms (<jats:italic>n<\/jats:italic>\u00a0=\u00a03) occurring at or below the discharge threshold generally exhibited complex hysteresis and dissolved P dilution patterns that were consistent with deeper\u00a0(&gt;122\u00a0cm) groundwater inputs with low dissolved P concentrations (0.04\u00a0mg L<jats:sup>\u20131<\/jats:sup>). In contrast, large storms occurring well above the discharge threshold (<jats:italic>n<\/jats:italic>\u00a0=\u00a04) induced rising water tables and preferential flow pathways that most likely tapped dissolved P\u2013enriched shallow\u00a0(&lt;20\u00a0cm) soil waters (0.89\u00a0mg L<jats:sup>\u20131<\/jats:sup>), producing consistent clockwise hysteresis and dissolved P flushing patterns. Notably, chemical and isotope hydrograph separation during two of the largest storms revealed significant event water fractions (59\u201368%) that strongly suggested a role for the rapid delivery of dissolved P via preferential flow pathways. Findings highlight the need to mitigate vertical P stratification as a means for reducing dissolved P flushing from ditch\u2010drained landscapes with legacy P.<\/jats:p>","DOI":"10.1002\/jeq2.20226","type":"journal-article","created":{"date-parts":[[2021,4,12]],"date-time":"2021-04-12T01:24:26Z","timestamp":1618190666000},"page":"680-693","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Examining sources and pathways of phosphorus transfer in a ditch\u2010drained field"],"prefix":"10.1002","volume":"50","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6845-9913","authenticated-orcid":false,"given":"Lauren R.","family":"Mosesso","sequence":"first","affiliation":[{"name":"Dep. of Plant and Soil Sciences Univ. of Delaware  531 S. 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