1. 8 spectrolysers to be deployed (Sept 2012) in upland mid-Wales As part of a £3M NERC BESS project (2012-2015) called Diversity in Upland Rivers for Ecosystem Service Sustainability DURESS Isabelle Durance (Cardiff University) Overall PI Nick Chappell (Lancaster University) Lancaster PI & responsible for WP4: physicochemical controls on aquatic biodiversity Tim Jones (Lancaster University) Field PDRA David Norris (CEH-Bangor) Field staff

2. Llyn Brianne (5 streams) LI3 (Nant y Craflwyn) LI6 (Nant Gwrâch – eastern) LI7 (Nant Gwrâch – southern)

3. LI8 (Trawsnant) G1 (Nant Melyn tributary) Llyn Brianne (5 streams)

4. Plynlimon & Pontbren (3 streams) Hafren (Plynlimon) Gwy (Plynlimon) Pontbren (nr Welshpool)

5. Installation 10 th Sept 2012 onwards Water quality stations S::CAN spectro::lyser TM ISCO3700 water sampler Hach SC200 pH system CS547A EC-Temp sensor OBS-3+ & Hydrowiper turbidity sensor (6/8) CR1000 logger Captrad GRP cabinet

6. Water-level stations (DOC, POC, nitrate etc load)

7. Raingauges & automatic weather stations S::CAN spectro::lysers TM 7x 35mm Optical Path Length For streams typically 1-10 mg/L DOC 1x 5mm Optical Path Length For Pontbren stream (Pen-y-cwm) typically 10-20 mg/L DOC Nick Chappell, Sept 2012