4.3.3. Scenario 3 - Water replenishment and pollutant reduction
The required quantities of water replenishment and pollutant reduction for each month are list in Table 8. For low restoration level, the lowest and highest water quantities for water replenishment are found in September and April, with the values of 299.83 × 104 m3 and 6 641.5 × 104 m3, respectively. The quantities of CODMn which need to be reduced vary between 8 729.46 kg in February and 67 544.64 kg in October. In August, the maximum 20 028.83 kg of TN need to be reduced and the minimum 1 886.60 kg in April are needed. Reducing TP is not necessary in the
months except for June. The reduction of 4.79 kg TP is required in this month. The maximum 10 940.50 × 104 m3 and the minimum 2 897.60 × 104 m3 water replenishment in April and September, respectively are needed to the achieve high restoration level. The value of CODMn reduction is the lowest in February (18 442.92 kg) and reaches a peak in October (76 259.72 kg). The requirements of TN reduction fluctuate between 6 611.22 kg in April and 23 240.77 kg in August. In April, July, August, and September, the concentration of TP is lower than that of the
requirement of the water quality Type II [25]. The maximum TP (163.26 kg) need to be reduced is found in June. In scenario 3, the quantities of water replenishment and pollutant reduction are reasonable.