Q2) A reservoir is constructed to provide a full storage capacity of 12YMm3 for the water supply activity in a region. The average runoff discharging into reservoir is found to be 250 Mm3 yyear. Meanwhile, the sediment inflow detected is about 18XY tonnes/year. This reservoir is designed with built-in sediment trap at the inlet with trap efficiency, of: =Kln(CIR)+M in which values of K and M are based on the Capacity Inflow Ratio (CIR) as presented in Table 2. Estimate the time in years required for the capacity of the reservoir to be reduced to 10% of its initial capacity. Take 1 tonnes =1000m3. (Note: AA12345 X=4;Y=5 ) [25 Marks] Table 2 * Use =100% if CIR is beyond 0.70