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<br />Tabl" 3
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<br />.....,"''''''''''''''''0''''''0''
<br />';:>i~.;"':"':"':"';~",,gs"':
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<br />15
<br />
<br />Flooded /'Ireas
<br />
<br />,
<br />.
<br />.
<br />
<br />The 10<1-year
<br />
<br />freqlle:>cy flooa has been selected by the State of
<br />
<br />ColorOldo as the flood event to be used for floodplain delineation and
<br />
<br />regulation.
<br />
<br />Thus
<br />
<br />the Flooded Area plates show only the boundary of
<br />
<br />the l~@-year floodplain.
<br />
<br />Since the base map for
<br />
<br />the Flooded
<br />
<br />Area
<br />
<br />.
<br />"
<br />,
<br />
<br />plates
<br />
<br />is a
<br />
<br />"
<br />
<br />contour map the outlines of the other flOod events,
<br />
<br />l~-, 5~-, and 5~~-year, can be readi 1 y plot ted using
<br />
<br />eho
<br />
<br />information
<br />
<br />in Table 3.
<br />
<br />The area delineated
<br />
<br />on the Flooded Area plates as the l~~-year
<br />
<br />floodplain meets the requirements of H.B. 1041 as an area of
<br />
<br />state
<br />
<br />"
<br />,
<br />,
<br />-
<br />
<br />interest.
<br />
<br />Also upon official approval of this report by the Colorado
<br />
<br />Water Con::;ervOltion Board the area outlined
<br />
<br />boundiHy will
<br />
<br />by the 100~year
<br />a floodplain area and maybe regulated
<br />
<br />flood
<br />
<br />be designated
<br />
<br />accordingly by the local officials.
<br />
<br />,
<br />..
<br />,
<br />
<br />Floodway
<br />
<br />,
<br />,
<br />,
<br />,
<br />.
<br />
<br />encroachment on floodplains, such as artifical fill, reduces the
<br />
<br />,
<br />,
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<br />!
<br />s
<br /><
<br />J
<br />,
<br />.
<br />
<br />flood-carrying
<br />
<br />cap'lclty ..nn incr..",'''''s floon hei'Jhts, th'JS increasins:
<br />
<br />flood hazards in areas beyond the encroachment its..lf. On.. i.lSp"ct of
<br />
<br />floodplain management
<br />
<br />involves balancing
<br />
<br />the economic gain
<br />
<br />from
<br />
<br />floodplain development against the resulting increase in flood hazard.
<br />
<br />>
<br />-
<br />.
<br />1
<br />,
<br />!
<br />
<br />For purposes of the Nation<ll FLood Insurance program, the concept of a
<br />
<br />floodway is used as a tool to assist local communities in this aspect
<br />
<br />of
<br />
<br />floodpl<lin management.
<br />
<br />Under
<br />
<br />this concept,
<br />
<br />the area of the
<br />
<br />.
<br />.
<br />.
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<br />.
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<br />.
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<br />
<br />l;}"~year flood is divided into a floodliay and a floodway fringe. The
<br />
<br />floodway is a channel of a stream, plus any adjacent floodplain areas,
<br />
<br />that must be
<br />
<br />kept
<br />
<br />free of encroachment in order that the l00~year
<br />
<br />ftood b.. cdrried without substantial increases in flood heights. As
<br />
<br />,
<br />.,
<br />
<br />minimum standards,
<br />
<br />Federal ;:nsurance Administration limits such
<br />
<br />,h,
<br />
<br />:6
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