The 2003 fires in NE Victoria burned 1.3 million ha of forest. Two previously instrumented research catchments (100-200ha) in the East Kiewa Valley have been recommissioned to measure post-fire changes in sediment and nutrient exports, and to relate these parameters to the hillslope-scale, fire-altered processes of runoff generation, and sediment/nutrient transport. Methods include rainfall simulation, unconfined flow experiments and soil water-repellency surveys. Initial analysis of early data indicates that total catchment exports of suspended sediment have increased by about 8 times over the pre-fire rates (from 35 t/y pre-fire to 280 t/y post-fire, for equivalent rainfall) and increases in phosphorous (associated with the suspended solids) export rates are likely to be of the same order. Exports of bedload have also probably increased 10 fold, though the levels of phosphorous associated with this fraction are low. These results are preliminary and ongoing analysis of early results from both the instrumented catchments will refine these estimates further. At the hillslope scale, considerable temporal variation in soil saturated hydraulic conductivity has been measured in both burnt (annual variation 40 mm/h) and unburnt (annual variation >100mm/h) areas, apparently resulting from measured seasonal oscillations in soil water repellency. Water repellency in burnt areas peaked in Spring following the fire (saturated hydraulic conductivity of 26 mm/h), coinciding with a loss of water repellency in the unburnt areas (saturated hydraulic conductivity of > 150 mm/h). In late summer of 2003 and 2004, both the burnt and unburnt sites had similar hydraulic conductivity values of around 60-70 mm/h. Observations will be used to improve the parameterisation of models representing post-fire sediment and nutrient production. These intensive small catchment observations will be combined with analyses and modelling of water quality, and modelling of yield at larger spatial scales to quantify and predict the hydrologic impact of the fires over much of the burnt area.