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<br /> <br />CHAPTER 2 <br />ewcs PRINCIPLES <br /> <br />SECTION 2 <br />C"".'CB OPERATII~G <br />PRINCIPLES <br /> <br />COLORADO <br />FLOODPLAIN AND STORMWATER CRITERIA MANUAL <br /> <br />floodway limits are needed <br />for the drainageway being <br />studied The limited study <br />method ma)o be used <br />when detailed floodplain <br />information is not <br />necessary_ The limited <br />study usually results in the <br />delineation 01 approximate <br />flood hazard areas without <br />base flood ele....ations. <br /> <br /> <br />The floodplain limits <br />resulting from a 1 aO-year L: <br />flood e....ent should be <br />delineated, as a minimum, for all floodplain studies. The 100-year peak discharge at <br />a gi....en point is the estimated peak discharge thaI has a 1 % probability of occurrence <br />in any gi....en year. <br /> <br />OPERATING PRINCIPLE <br /> <br />THE 100-YEAR FLOODPLAINS DELINEATED BY DETAILED OR LIMITED <br />METHODS ARE CONSIDERED TO BE THE REGULATORY FLOODPLAINS OF <br />THE STORM OR FLOODWATER RUNOFF CHANNELS IN COLORADO AS <br />DEFINED IN 37~0-106, COLORADO REVISED STATUES (CRS). <br /> <br />2.4 DESIGNATED FLOODWAYS <br /> <br />The floodway represents the community's regulatory limit of encroachment into the <br />1 OO-year floodplain for those watercourses with the established floodway boundaries. <br /> <br />c <br /> <br />,_. O' R<>OOP'I..... .0.. u"."'JIO""'''.O _.n... 00..000 <br /> <br /><>IO....,""su"..c. <br />/ <br /> <br />',ooo*u ' <br />,.~, -1"--" <br />, ......... <br />-c..&O...., <br />...OO<luov..noto"'.... <br />"'''''''" _0 *If_ ",ooo*u <br />I,~ <br /> <br />-==--'\I~-"R_'-; <br /> <br />o <br /> <br /> <br />O1.000*u <br />.- <br /> <br />''''''''''0'''''-''' <br />, <br /> <br />."""0."""..... <br />, <br /> <br />I.... <br /> <br />1 <br /> <br /> <br />...<><>Ou-"'vU..... <br />."""".""""'0""'_..' <br />""...0000'I.... <br /> <br />,,"". 01' U,O*..,1 <br />'''''''0'-=-''' ....,.-, <br />....ouooo_...e.*... <br />"<IT"'......."....."'......... <br />'uf..C.UOS'" <br />..,..,.T..........,....O. <br /> <br />,_ . . . os ..-- HOOO "'hU>Ooo .,UOJIi! .""'''0.0'''_''' <br />..- C .O'S .... H<><>O IUV..T_ .H'" ..c._..c_.., <br /> <br />. _c...... ...,T '0 "CUO" 'OOT '"u....'- ........""'. .0."""_.' .......,. "0..-....., _ .u... ""_T.. ....C....,.. ITUI <br /> <br />The floodway is defined by Federal Emergency Management Agency (FEMA) as the <br />channel plus any adjacent floodplain areas, that must be kept free of encroachment <br />so thaI the 100-year discharge can be conveyed with no more than one foot rise in <br />the water surtace above the base flood ele....ations (BFE). Encroachment into the <br /> <br />APRIL 2004 <br /> <br />CWCB OPERATING <br />PRINCIPLES <br /> <br />CH2-204 <br />