5Wilhite D A,Drought Assessment, Management and Planning.Theory and Case Studies[M] .Boston, Dordrecht and London: Klnwer Acadeic Publishers, 1993.
6City of New York Department of Environmental Protection. Drought Management Plan and Rules[OL] [1998-12-29]http:// www.nyc.gov/html/dep/pdf/droughtp.pdf.
7City of Arlington Water Utilities Department.Drought Contingency Plan[OL] [2005] http://www.arlingtontx.gov/water/pdf/Arlington% 20Drought%20Contingency%20Plan%202005.pdf.
