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CHAPTER 2 C\VCS PRINCIPLES SECTION 2 CWCS OPERATING PRINCIPLES COLORADO FLOODPLAIN AND STORMWATER CRITERIA MANUAL OPERATING PRINCIPLE THE CWCB RECOMMENDS THAT GOVERNMENT ENTITIES IN COLORADO ADOPT THE STATEWIDE MANUAL AT THEIR OWN DISCRETION. WHOLLY OR IN PART, DEPENDING ON THE NEEDS OF THE ADOPTING AGENCY. EACH ENTITY ADOPTING THE CONTENTS OF THE STATEWIDE MANUAL IS RESPONSIBLE FOR ENFORCEMENT OF THE MANUAL WITHIN ITS JURISDICTIONAL BOUNDARIES. IN THE EVENT THAT CONFliCTS ARISE BETWEEN THE STATEWIDE MANUAL AND OTHER DRAINAGE MANUALS, THE MANUAL ADOPTED BY THE ENTITY THAT HAS JURISDICTION OVER THE SUBJECT AREA WILL GOVERN. 2.2 NEW AND REVISED FLOODPLAIN DEliNEATIONS In order to effectively regulate existing and new floodplain improvements and to reduce the amount of future losses due to flooding. flood hazard areas should be clearly identified. studied, and delineated. Many drainageways have been analyzed by various rocal, state, and federal agencies. and their floodplain delineations can be found on either the Flood Insurance Rate Maps (FIRMs) published by the Federal Emergency Management Agency (FEMA) or the community's floodplain maps. However, throughout the State, numerous floodplain areas that are subject to severe flooding have not yet been studied. and as new developments occur in these floOd hazard areas. local agencies face the challenge of developing the flood hazard area information. l, OPERATING PRINCIPLE ALL NEW AND REVISED FLOODPLAIN DEliNEATION STUDIES WITHIN THE STATE OF COLORADO SHOULD BE PREPARED IN ACCORDANCE WITH THE COLORADO WATER CONSERVATION BOARD (CWCB) "RULES AND REGULATIONS FOR THE DESIGNATION AND APPROVAL OF FLOODPLAINS AND OF STORM OR FLOODWATER RUNOFF CHANNELS IN COLORADO". THE FLOODPLAIN DEliNEATION CRITERIA PRESENTED IN THE STATEWIDE MANUAL ARE THE TECHNICAL GUIDEliNES OF THE CWCB RULES AND REGULATIONS. 2.3 REGULATORY 100-YEAR FLOODPLAINS Floodplain is the area of land susceptible to being inundated as a result of the occurrence of a flood event Floodplain boundanes can be delineated based on two different analysIs approaches detailed and limIted methods The detailed study approach should be used when accurate flOOdplain Information including floodplain limIts. water surface elevations and profiles. flood depths and velocities. and APRIL 2004 CWCB OPERATING PRINCIPLES CH2-203