[1] Univ Aberdeen, Sch Geosci, Aberdeen AB24 3UF, Scotland
[2] Oregon State Univ, Coll Forest Engn, Corvallis, OR 97331 USA
[3] UNESCO, IHE, Inst Water Educ, Dept Water Engn, NL-601 DA Delft, Netherlands
[4] Delft Univ Technol, NL-2600 AA Delft, Netherlands
[5] Plymouth State Univ, US Forest Serv, Plymouth, NH 03264 USA
[6] Univ Wageningen, Hydrol & Quantitat Water Management Grp, Wageningen, Netherlands
[7] ETH, Inst Environm Engn, Zurich, Switzerland
[8] Queen Mary Univ London, Dept Geog, London E1 4NS, England
[9] Macaulay Res Inst, Aberdeen, Scotland