Laserfiche WebLink
<br /> <br />CHAPTER 2 <br />CWCS PRINCIPLES <br /> <br />SECTION 2 <br />CWCS OPERA TlNG <br />PRINCIPLES <br /> <br />COLORADO <br />FLOODPLAIN AND STORMWATER CRITERIA MANUAL <br /> <br />year flood elevation If the 500-year flood elevation is not available, the lowest floor <br />should be elevated at least 3 feet above the 1 aD-year flood elevatIon. <br /> <br />Critical facilities include. but are not limited to: <br /> <br />. Structures or facilities that use or store highly volatile. flammable, explosive. <br />toxic and/or water reactive materials. <br />. Hospitals, nursing homes and housing likely to contain occupants who may <br />not be sufficiently <br />mobile to avoid death or <br />injury during a flood. <br />. Police stations, fire <br />stations, vehicle and <br />equipment storage <br />facilities. and <br />emergency operations <br />centers that are needed <br />for flood response <br />activities before, during <br />and after a flood event. <br />. Public and pnvate utility <br />facilities that are vital to <br />maintaining or restoring <br />normal services to flooded areas before, during and after a flood event. <br /> <br /> <br />OPERATING PRINCIPLE <br />THE CWCB RECOMMENDS THAT COMMUNITIES USE THE SOD-YEAR <br />FLOODPLAIN AS DESIGN CRITERIA FOR DEVELOPMENT OF CRITICAL <br />FACILITIES. <br /> <br />2.9 FLOOD CONVEYANCE IN IRRIGATION DITCHES AND CANALS <br /> <br />There are a number of active. semi-active. or abandoned irrigation ditches and <br />canals within the State of Colorado. These irrigation facilities were originally <br />designed with flat slopes and limited flow conveyance capacities to mainly convey <br />irrigation water to farmers. settlers. and other users. Because the canals and ditches <br />were usually designed to <br />traverse watersheds, <br />many of these facilities <br />have historically <br />intercepted storm runoffs <br />from the upstream rural <br />and agricultural type <br />basins. <br /> <br /> <br />However, with <br />urbanization of the <br />upstream basins. the <br />storm runoffs entenng the <br />irrigation facilities have <br />Increased In rate, quantity. <br />and frequency Since the <br /> <br />'. <br /> <br />J <br /> <br />APRIL 2004 <br /> <br />CWCB OPERATING <br />PRINCIPLES <br /> <br />CH2-20B <br />