The study of delimitation method of reservior reserves based on DEM

Due to the increasing concern of drinking water problem in China, in order to provide the good technical support for the protection of drinking water sources, this study applies the Hydrological model to generate the initial drainage basins and watersheds boundaries along Zhougongzhai Reservoir and Jiaokou Reservoir of the Ningbo City, China, by using the 5 meters spatial resolution digital elevation model (DEM). The 0.5-meter resolution aerial photos and other ancillary data sets are also integrated to modify the catchments boundaries of high-level mainstreams from the upstream reservoirs. As a result, the first-class and second-class protection zones are delimited based on the combined results from the first two steps.