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<br />functions during periods of flooding should not be compromised, Therefore, it is suggested these critical <br />facilities, which would be defmed to include facilities necessary to maintain the health and safety of the <br />public in a community, except for public road systems, be designed to withstand a 500 year flood event <br />to insure they are capable of preforming their intended functions during even some of the most extreme <br />flooding events experienced in Colorado, <br /> <br />Establish Minimum Criteria for Stoml Water OetentioT!, The CWCB should establish minimum criteria <br />for detention of excess runoff from development, One of the key factors to live in harmony within stream <br />corridors, particularly within the floodplain, is to insure that historic events, which are used to predict <br />future events and are used to design and located facilities in proximity to the floodplain, do not change <br />significantly, Unfortunately, development in a watershed which changes the historic runoff pattern, both <br />in time and duration, causes adverse impacts to downstream residents, Therefore, the CWCB believes it <br />is in the public interest to propose that a minimum statewide criteria for detention of excess of runoff from <br />future development be established. This would require that increased storm runoff from new development <br />activities shall be detained and standards should be provided for how that should be accomplished. This <br />action will require establishment of "baseline hydrologic ,;ondition" for the State's basins/watersheds, <br /> <br />Establish a Statewide Wetlands Bankng Account, The CWCB should establish a statewide wetlands <br />banking/accounting and replacement program to assist in maintaining existing wetland conditions, The <br />banking system would protect the state's existing level of wetlands and provide opportunities for the better <br />management of future development aCI:ivities, Currently, Colorado does not have such an account and it <br />cannot take credit for activities such as groundwater recharge projects which have as another benefit, <br />creation of a wetlands, As Colorado enters a new area of stewardship of its streams, a method of <br />accounting such activity would be very valuable. <br /> <br />PreDare a Stateside Model Stonnwater Criteria Manual. The CWCB should prepare a statewide model <br />stonnwater criteria manual. Currently, there is no such manual for Colorado, Each community is left to <br />its own devices and resources to addre:;s stonnwater management. A model-criteria model would insure <br />that all the important factors ofstonnwal:er management were addressed, provide minimum standards based <br />upon data from stonns in Colorado, and allow local communities to t,xercise latitude in determining what <br />additional criteria should be considered for their local communities, Many communities lack criteria to <br />guide the planning and design of storm drainage infrastnJ(,tul'e, <br /> <br />VII-8 <br /> <br />97-060.00] <br />