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FLOOD07970
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Last modified
1/25/2010 7:13:17 PM
Creation date
10/5/2006 3:20:53 AM
Metadata
Fields
Template:
Floodplain Documents
County
Weld
Community
Frederick, Firestone
Stream Name
Tri-town drainageway
Basin
South Platte
Title
Weld County Tri-Area Sanitation District Storm Water Feasibility Study
Date
1/1/2000
Prepared For
Weld County
Prepared By
Sear-Brown Group
Floodplain - Doc Type
Project
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<br />The Sear-Brown Group reviewed the [,25 Corridor Master Drainage Plall <br />Godding Hollow and Tri-Towll Basins South Weld County report and verified that <br />the hydrologic values derived within the report appear to be representative of the <br />Tri-Town Basin. From the table of hydrologic values above, the following <br />conclusions can be drawn: <br /> <br />1. The existing condition 100 year hydrology will yield the greatest amount <br />of storm water runoff that the regional detention pond will experience. <br /> <br />2. Basins 62 and 91 are mostly developed today. These basins will contribute <br />the majority of undetained storm water runoff that enters the regional <br />detention pond now and in the future. <br /> <br />3, As basins 61,63,92,93, and 94 develop and utilize the current localized <br />detention pond release criteria, hydrologic contributions to the regional <br />detention pond will be reduced. <br /> <br />C. Field Investigations <br /> <br />On July 29, 1999, Kevin Gingery and Russell Dahlgren visited the Tri,Town Basin <br />to observe the basin topography, basin hydrologic features, locations and <br />conditions of existing crossings and drainageway structures, and locations of <br />adjacent residential and commercial buildings. The existing storm drainage <br />infrastructure, as noted within Figure 5 on the following page, was observed to be <br />in place as documented by Anderson Consulting Engineers, Inc" clear of debris, <br />and available to receive what storm water runoff they were capable of handling, <br />The basin topography slopes as indicated within Figure 2, Between Weld County <br />Road 13 and the communities of Frederick, Evanston, and Firestone, the <br />abandoned Union Pacific Railroad embankment exists. The railroad tracks have <br />been removed, but large quantities of earthen embankment remain, The existing <br />Tri,Town Drainageway is located between the railroad emban}ment and the <br />residential homes, The Tri,Town Drainageway varies in shape, depth, and side <br />slopes along the communities of Frederick, Evanston, and Firestone. Upstream <br />(south) of Frederick, the Tri,Town Drainagway is not well defined as it traverses <br />existing farm land upstream to State Highway 52, The Tri,Town Drainageway <br />does not continue upstream of State Highway 52, It appears from the preliminary <br />design presented later in this report that excess earthen soil is available from the <br />proposed regional detention pond site to construct the regional detention pond <br />emhankment. Other construction materials snch as riprap and concrete will need <br />to be imported to the project site <br /> <br />1.3 <br />
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