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<br />.~, ~ <br /> <br /> <br />CHAPTER 2 <br />CWCS PRINCIPLES <br /> <br />SECTION 2 <br />CWCS PROPOSED <br />OPERATING <br />PRINCIPLES <br /> <br />COLORADO <br />FLOODPLAIN AND STORMWATER CRITERIA MANUAL <br /> <br />interrelate with the water rights, which should be addressed when planning the <br />facility to preserve their integrity. <br /> <br />Ditches that have direct flow rights from a stream are controlled by headgates. <br />Drainage improvements, which alter the quality (or quality) of the water available to <br />the headgate, affect the ability to divert water. Other ditches obtain all or portions of <br />the rights by intercepting the shallow groundwater (seepage right). If the water right <br />has not been abandoned or transferred to another location, the drainage deign <br />(including the sub-surface system) should be planned and constructed to preserve <br />the water right. Similar situations can also occur when planning drainage facilities <br />near reservoirs. <br /> <br />PROPOSED OPERATING PRINCIPLE <br /> <br />THE CWCB RECOGNIZES THE IMPORTANCE AND EXISTENCE OF <br />CONDITIONAL AND ADJUDICATED WATER RIGHTS IN COLORADO. ALL NEW <br />DRAINAGE FACILITIES SHOULD BE PLANNED AND CONSTRUCTED WITH <br />PROPER RECOGNITION GIVEN TO THE EXISTING WATER RIGHTS AND <br />APPLICABLE WATER LAWS. DRAINAGE SYSTEMS HAVE THE POTENTIAL <br />TO INTERFERE WITH EXISTING WATER RIGHTS, THEREFORE, THE VALUE <br />AND USE OF WATER RIGHTS SHOULD BE ADDRESSED DURING PLANNING <br />AND IMPLEMENTATION OF DRAINAGE FACILITIES WHERE APPLICABLE. <br /> <br />2.12 WATER QUALITY <br /> <br />A number of studies by the Environmental Protection Agency (EPA) and others have <br />shown that site disturbances due to construction and resulting urbanization <br />decreases the quality of stormwater runoff from the natural conditions. Degraded <br />stormwater runoff quality can have significant adverse impacts on the aquatic <br />ecosystem of the receiving water body, thereby ultimately impacting the quality of life <br />in adjacent communities <br /> <br />In 1972. Congress passed what is currently referred to as the Clean Water Act <br />(CWA). The Act established the National Pollutant Discharge Elimination System <br />(NPDES) program. On December 8, 1999, EPA published final rules for the Phase II <br />stormwater program. Until recently, efforts under the NPDES program have focused <br />on non-stormwater discharges from industries and municipal wastewater treatment <br />plants. However, in the last several years, the EPA has expanded the NPDES <br />program to cover stormwater discharges. <br /> <br />PROPOSED OPERATING PRINCIPLE <br /> <br />THE CWCB ENCOURAGES DESIGN OF DRAINAGE FACILITIES AND OTHER <br />MEASURES THAT ENHANCE THE QUALITY OF STORM RUNOFF. PLANNING <br />AND DESIGN OF DRAINAGE FACILITIES SHOULD BE PREPARED TO <br />MINIMIZE ADVERSE IMPACTS AND/OR IMPROVE WATER QUALITY OF THE <br />RESULTING STORM RUNOFF DISCHARGES. DRAINAGE FACILITIES MAY BE <br />DESIGNED TO FUNCTION AS BOTH STORM RUNOFF CONVEYANCE AND <br />WATER QUALITY ENHANCEMENT FACILITIES. THIS RECOMMENDATION IN <br />NO WAY SUPERSEDES REQUIREMENTS RELATED TO THE EPA's NATIONAL <br />POLLUTENT DISCHARGE ELIMINATION SYSTEM (NPDES) OR OTHER WATER <br />QUALITY STANDARDS. <br /> <br />MARCH 2004 - Draft <br /> <br />CWCB PROPOSED <br />OPERATING PRINCIPLES <br /> <br />CH2-208 <br />