Table 6. Examples of entries in the biophysical indicator lists for a study in Lesotho. Discipline Indicator list entry Links to flow Sedimentology Deposition of colloidal material Minimum velocity for maintenance of movement of colloidal material in main channel = 0.05 m/s (Metsi Consultants 2000c) Water quality Nutrient levels Nutrient levels in pools increase under low flow conditions, water in pools flushed by > Class 2 floods (Metsi Consultants 2000d) Vegetation Chenopodium album Mostly in the wetbank vegetation zone, whose width is reduced by a decrease in the volume and variability of low flows and in the number of Class 1 floods (Metsi Consultants 2000a) Fish Maloti Minnow Inhabits quiet (< 0.2 m/s) shallow (0.21–0.30 m) waters in rocky reaches with high water quality (Arthington et al. 2003) Invertebrates Simulium medusaeforme Filter feeder on cobbles in slow (0.01–0.49 m/s), often polluted water (Metsi Consultants 2000e)