Abstract: With the shortage of water resources and aggravation of water supply risk in cities,more and more attention has been paid to the problems of emergency water supply.Now,research on emergency water supply already becomes one of the tasks which should be timely resolved.And the way to resolve the problem,choice and demonstration of the water source field are important and profound to cities.As to the cities in north China,they are affected by monsoon climate.As a result,the distribution of precipit...