“…headwater streams in the current study were seasonal in nature, with levels generally lower in spring. Low flow conditions, which are common in upland streams in Ireland over the summer period, can exacerbate sedimentation (Braccia & Voshell, 2006;Conroy, Turner, Rymszewicz, O'Sullivan, et al, 2016;Vidon et al, 2008;Wood & Armitage, 1999) and likely contribute to this seasonal trend. (Conroy, Turner, Rymszewicz, O'Sullivan, et al, 2016;Naden et al, 2016;Zaimes & Schultz, 2011), and this material can become an "internal" source of SS during high flows (Kurashige, 1996) or can be carried via vertical flow patterns into the hyporheic zone (Kibichii et al, 2015).…”