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Rethinking the Contribution of Drained and Undrained Grasslands to Sediment-Related Water Quality Problems

^a Geography Dep., Univ. of Exeter, Amory Building, Rennes Drive, Exeter, Devon, EX4 4RJ, United Kingdom
^b Cross Inst. Programme for Sustainable Soil Function, Inst. of Grassland and Environmental Research, North Wyke, Okehampton, Devon, EX20 2SB, United Kingdom
^c Lancaster Environment Centre, Lancaster Univ., Lancaster, LA1 4YQ, United Kingdom

View larger version (62K): [in this window] [in a new window]   Fig. 1. A location map and aerial photograph of the Rowden field-site, Devon, UK. (A) Drained 1-ha lysimeter. (B) Undrained 1-ha lysimeter.

View larger version (31K): [in this window] [in a new window]   Fig. 2. Schematic cross-section of undrained and drained field-scale lysimeters at Rowden, showing the hydrological pathways and flow measurement system. Adapted from Armstrong and Garwood (1991).

View larger version (32K): [in this window] [in a new window]   Fig. 3. Hydrographs (uncertainty is illustrated using the minimum and maximum discharges) of undrained (top) and drained (bottom) 1-ha grassland lysimeters in response to a natural rainfall event that occurred between 0100 and 1753 h on 7 March 2006.

View larger version (21K): [in this window] [in a new window]   Fig. 4. Hydrograph of the 2005–2006 hydrological season on the drained lysimeter. The data are compiled from hourly instantaneous data derived from the polynomial fit.