Table 1.  4-hour and 24-hour PMP for Hong Kong

Area 10 square km: 4-hour PMP is 490 mm and 24-hour PMP is 1250 mm.
Area 100 square km: 4-hour PMP is 380 mm and 24-hour PMP is 930 mm.
Area 500 square km: 4-hour PMP is 285 mm and 24-hour PMP is 690 mm.
Area 1000 square km: 4-hour PMP is 240 mm and 24-hour PMP is 580 mm.