630 tons. A person's daily water use is about 100 liters, and the amount of water used to clean dishes and kitchen utensils for each meal is about 5 liters. Therefore, if we assume that this Chinese restaurant has a daily traffic of 200 people and each person consumes 1 meal per day, then the daily water consumption is about (200100+2005)1=21000 liters. The water consumption for 30 days in a month would be about 2100030=630000 liters, which is about 630 tons.