River Floods - Investigations in Environmental Geology - page 173

11. What hazard zones are identified on the map? How often
are floods expected in zone A? In zone B?

14. Although the data that comprise flood hazard depictions
on this map were collected in 1974 and revised in 1975, what
year was this map published? What changes might have
taken place in this area between the time the data were col-
lected and the map was published?

12. Are areas in zone C are completely free from flood hazards?

15. What year is it now? What additional changes do you
think might have taken place in the drainage basin of the
Potomac River? What will be the likely impact of these
changes on flood hazards that have been mapped?

13. Are all the hazard zones on the map the result of natural
processes? Look carefully and explain.

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