1. Hydro., Cooperative Res. Ctr. for Catchment Hydro., Commonwealth Scientific and Industrial Res. Org. Land and Water, GPO Box 1666, Canberra, ACT, 2601, Australia; formerly, Dept. of Civ. Engrg., Monash Univ., Clayton, Victoria, 3145, Australia. E-mail: Mathew.Gilfedder@ cbr.clw.csiro.au
2. Sr. Lect., Dept. of Geological Sci., Univ. Coll. London, Gower St., London WC1E 6BT, U.K.
3. Dir., Cooperative Res. Ctr. for Catchment Hydro., Dept. of Civ. Engrg., Monash Univ., Clayton, Victoria, 3145, Australia.