Laserfiche WebLink
<br />JElydraulic Compliance for Dillon :Reservoir <br />WHEREAS, the Denver Water Department has obtained detailed topographic mapping <br />of the shoreline of Dillon Reservoir, has mapped elevation 9031 MSL on said topographic <br />mapping in order to prepare the Shoreline Mapping, and has made said floodplain mapping <br />availablle to the Colorado Water Conservation Board; and <br /> <br />WHEREAS, the approximate floodplain delineation for the 100-year floodplain of <br />Dillon Reservoir within the Town of Dillon has been prepared by the Colorado Water <br />Conservation Board utilizing the Shoreline Mapping prepared by the Denver Water <br />Department; and <br /> <br />]l>efinitions of Terms <br />WHEREAS, the Colorado Water Conservation Board staffhas defined terminology <br />pertinent to the preparation of approximate ~md detailed floodplain information and to proposed <br />development activity within delineated floodplains, as described in Table 3 below: <br /> <br />Table 3 <br />Definitions for Prepnrine: Floodplain Information <br />and for Regulatinl! Developmenlt Proposals in ApDroximate Floodplains <br /> <br />Term ....... . 1'....., . l>efihitiQn. <br />.. .. . <br />Approximate hydrology 100-year peak jlow values estimated for the hydrologic point of interest using <br /> "Guidelines" or other acceptable approximate hydrologic method approved by the <br /> CWCB <br />Detailed hydrology 100-year (and 10-, 50-, and 500-year when applicable) peakjlow values computedfor <br /> the hydrologic point of interest using an acceptable detailed methodology, other than <br /> the "Guidelines", such as an at-site stream gage analysis, a regional stream gage <br /> analysis, or a rainfall-runoff model <br />Approximate hydraulics Water surface elevations or jlow depths computed for the location or reach of interest <br /> using normal depth flow calculations (i.e. Manning's equation/slope-area method) with <br /> manual techniques or computer programs such as QUICK-2 and F/owMaster <br />Detailed hydraulics Water surface elevations (basejlood elevations) computedfor the stream reach of <br /> interest using a step-backwater computer model, or other acceptable one-dimensional <br /> or two dimensional computer model, such as HEC-2 or HEC-RAS <br />Limited development Development involving parks, open space, golf courses, agriculture, bridges and culverts <br /> serving single farms or single family homes or cabins, pole barns, and individual single <br /> family residential structures <br />Significant development All development that does not fall under one of the categories listed under the definition <br /> of 'Limited Development', including the special case of development that involves 5 <br /> acres or more or 50 units or more, whichever is more restrictive <br /> <br />Need for a Case-by-Case Review of Development Proposals <br />WHEREAS, the designation and approval by the Colorado Water Conservation Board <br />of the approximate floodplain information for the stream and reservoir listed in Table 2 above is <br />contingent upon the understanding by the Town of Dillon of the need for a case-by-case review <br /> <br />4 <br />