The hydrological units of administration (e.g. Drainage Departments, etc.) often do not correspond with the planning units or administrative units (New Orleans synchronised them after Katrina). Which levels should be distinguished in a spatial sense, with the river basin being the biggest scale?
The hydrotechnical units of the drainage of deltacities are set by human planning. Do the engineered units of control of water correspond with the hydrologic-ecologic understanding of waterflows?