WSP03580

• File Number: 8030
• Description: Section D General Correspondence-Other Organizations/Agencies
• State: CO
• Date: 5/1/1972
• Author: USWRC
• Title: US Water Resources Council-1972-1977-Flood Hazard Evaluation Guidelines for Federal Executive Agencies
• Water Supply Pro - Doc Type: Report/Study

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coastal hazard ZOne

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coastal
flood
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increasin~ hazard

high ha7.ard z.one

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dune
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open sea

FIGURF 2. --Profiles, not to scalf', of a typical erosive ha7ard
zone of a seacoast. Profile A is th(. sunlmer and B .h~ winter
profile. For this particular shore, the profiles vary not only
from season to season but also from the OCcurrence of great
storms at sea. Thus, the profile!" shown are not the extremes
that may exist. Coastal areas with rock shores or cliffs will
have different and more stable profiles.

Near the IOO-year high water frequency line there is vegeta_
tion of a relativel}' permanent kind; near and on the dune the
vegetation is temporary u~less special means are taken to
make it less so.

The Open sea may be occupied at variolls locations by fishing
piers. docks. etc.. and.also by engineering works such as
groins or breakv.'aters. The high hazard zone is where the
summer acti\'ity OCCurs (SWimming. surfing, beach use. etc.l.
Such zones can be made sonlewhat nlore safely inhabitable by
the use of deep piling for structural foundations. with the
structures themseh.es well above hi~h water. Land".\"ard of
that zone are restaurant:i. habitations. etc.. with relative
safety and permanenCe increasin.l! further landward.

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