Description: This layer represents the Cadastral Hydrography lines derived from various sources for the Urban and Rural Cadastral Mapping Program. Sources for the boundaries include: Land Title Office registered plans of survey; official township plans; digitized boundaries from large scale aerial photography captured for the Urban Cadastral Mapping program; 1:20,000 Provincial Base Mapping Series, 1:250,000 scale hydrography and federal National Topographic Data Base (NTDB) for the Rural Cadastral Mapping program. This layer does not contain information for the municipalities of Edmonton or Calgary. The information for these municipalities is managed by each municipality independently.