Your local government has tasked you to carry out preliminarily the design of a dam at the outlet of a specific quaternary catchment (QC) of the Orange Drainage system. The QC should belongs to one of the secondary tertiary catchments D11, D12 or D13. The specific catchment has the most occurrence of irrigated area, with the lowest mean annual precipitation in its tertiary. The design is based on the data provided in the Water Resources of 1990 (WR90) reports as follows: -The live storage (10x106 m3) is based on a recurrence interval of 100 years low flow sequence with an allowance of 20 % for sediment accumulation. - The region applies strictly to catchment areas between 0 and 1400 km2 such that the upper bound of the sediment yield curve is nonlinear. Consider medium category (for sediment accumulation) - Use 95% confidence interval for sedimentation yield. Determine: The gross draft (in Mm3/a) to be met 2.1. Sediment rate (t/a) 2.2. Trap efficiency (%) 2.3. Average silting rate (t/a) 2.4. Total dam capacity (Mm3)