Answer Happy

a) Consider the following 1km resolution Digital Elevation Model (DEM) (units 'm') for a region that has an annual average rainfall of 1000mm per year. A B E F 1 83 102 100 92 89 112 80 85 115 120 114 95 92 110 117 80 93 91 106 98 86 78 86 88 5 95 80 83 81 76 77 Assuming 50% of precipitation becomes loss for this region, estimate the following [9 marks]: (i) the largest catchment within the DEM, (ii) the coordinates of the cell that represents the outlet for this catchment, the volume of runoff (in m³) generated each year in this catchment. (iii) (b) A tree-logging contract is awarded to a company to cut a significant fraction of the vegetation in this region. In one sentence only, comment on what the impact of this tree logging would be on [4 marks]: (i) The volume of the annual runoff estimated in (a) and why? (ii) The design flood peak for the outlet of the identified catchment and why? 2 3 4