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11. OR~fT 9. Replace the Illinois Gulch culverts beneath Boreas Pass Road. 10. Perform survey work to determine of the Blue River will break out above the Washington Avenue foot bridge and regrade the area if necessary. There are several other important drainage related tasks that were not included in the list, but should be pursued. The weir structure on Jones Gulch that splits the flow between the overflow and low flow channel must be repaired. This is probably outside the Town's responsibility and is a matter for the property owners to resolve. The Town also needs to work with the County on insuring that appropriate drainageways and easements are provided for South and Middle Barton Creeks to be conveyed to the Blue River. CUrrent County requirements would likely only address the 25-year storm. This could cause serious problems when the airport area is developed and a lOO-year flood occurred. DRAINAGE EASEMENTS In addition to the easement required to perform the prioritized improvements, there are additional areas where the Town should be aware of future easements required for drainageways. These are listed below. 1. Basin 2. Basin 3. Basin 4. Basin E-l - From Broken Lance Drive to Illinois Gulch E-2 - From Snoberry Lane to Illinois Gulch , E-7 - Easement to convey flows across the bank at the existing development to French Creek. W-3 - Easement to convey flows to the Blue River DETENTION Based on comparisons of existing and future developed flows along with an assessment of the existing drainage system, recommendation for detention requirements were developed. Oetention requirements are listed as either mandatory or on a case by case basis. The latter category is for watersheds that would receive little benefit from detention because of either the small impact that development would have in the basin or due to an existing system that could convey flows under the future developed condition. 49