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<br />B. CHANNELIZATION <br /> <br />Flooding Source: <br /> <br />Name of Structure: <br /> <br />1. Accessory Structures <br /> <br />The channelization includes (check one): <br /> <br />o Levees [Attach Section E (Levee/Floodwall)] <br />o Superelevated sections <br />o Debris basin/detention basin <br />o Other (Describe): <br /> <br />o Drop structures <br />o Transitions in cross sectional geometry <br />o Energy dissipator <br /> <br />2. Drawinq Checklist <br /> <br />Attach the plans of the channelization certified by a registered professional engineer, as described in the instructions. <br /> <br />3. Hvdraulic Considerations <br /> <br />The channel was designed to carry <br /> <br />(cfs) and/or the <br /> <br />-year flood. <br /> <br />The design elevation in the channel is based on (check one): <br /> <br />o Subcritical flow <br /> <br />o Critical flow <br /> <br />o Supercritical flow <br /> <br />o Energy grade line <br /> <br />If there is the potential for a hydraulic jump at the following locations, check all that apply and attach an explanation of how the hydraulic jump <br />is controlled without affecting the stability of the channel. <br /> <br />o Inlet to channel 0 Outlet of channel 0 At Drop Structures 0 At Transitions <br />o Other locations (specify): <br /> <br />4. Sediment Transport Considerations <br /> <br />Was sediment transport considered? 0 Yes 0 No If Yes, then fill out Section F (Sediment Transport). <br />If No, then attach your explanation for why sediment transport was not considered. <br /> <br />C. BRIDGE/CULVERT <br /> <br />Flooding Source: Cache la Poudre River <br /> <br />Name of Structure: Harmony Road Bridge <br /> <br />1. This revision reflects (check one): <br /> <br />o New bridge/culvert not modeled in the FIS <br />f8I Modified bridge/culvert previously modeled in the FIS <br />o New analysis of bridge/culvert previously modeled in the FIS <br /> <br />2. Hydraulic model used to analyze the structure (e.g., HEC-2 with special bridge routine, WSPRO, HY8): HEC-RAS (version 3.1.3) <br />If different than hydraulic analysis for the flooding source, justify why the hydraulic analysis used for the flooding source could not analyze the <br />structures. Attach justification. <br /> <br />3. Attach plans of the structures certified by a registered professional engineer. The plan detail and information should include the following <br />(check the information that has been provided): <br /> <br />f8I Dimensions (height, width, span, radius, length) <br />o Shape (culverts only) <br />f8I Material <br />o Beveling or Rounding <br />f8I Wing Wall Angle <br />o Skew Angle <br />f8I Distances Between Cross Sections <br /> <br />f8I Erosion Protection <br />f8I Low Chord Elevations - Upstream and Downstream <br />f8I Top of Road Elevations - Upstream and Downstream <br />f8I Structure Invert Elevations - Upstream and Downstream <br />f8I Stream Invert Elevations - Upstream and Downstream <br />f8I Cross-Section Locations <br /> <br />4. Sediment Transport Considerations <br /> <br />Was sediment transport considered? DYes f8I No If yes, then fill out Section F (Sediment Transport). <br />If No, then attach your explanation for why sediment transport was not considered. <br /> <br />FEMA Form 81,89B, SEP 02 <br /> <br />Riverine Structures Form <br /> <br />MT,2 Form 3 Page 2 of 10 <br />