1. Dep. of Geography and Environmental Management Univ. of Waterloo Waterloo Ontario N2L 3G1 Canada
2. Water Institute Univ. of Waterloo Ontario N2L 3G1 Canada
3. Grand River Conservation Authority 400 Clyde Rd. Cambridge ON N1R 5W6 Canada
4. Water Services Division Wastewater Operations, Regional Municipality of Waterloo Kitchener Ontario N2G 4J3 Canada
5. Rutherford Appleton Laboratory Science and Technology Facilities Council Harwell Campus Didcot OX11 0QX UK