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DWR_2717593
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Last modified
7/11/2017 11:09:13 AM
Creation date
3/3/2015 11:31:22 AM
Metadata
Fields
Template:
Dam Safety
Document Date
2/27/2015
Document Type - Dam Safety
Report
Division
5
Dam ID
040110
Subject
CARRIAGE HILLS #2 (LOWER) DAM - FAILURE FORENSIC REPORT REVISED
DWR Send/Recipient
DSB
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CARRIAGE HILLS NO. 2 DAM, Dam Failure Forensic Investigation Report Page 20 <br />February 27, 2015 <br /> <br />Figure 13: FHWA HY8 summary output for Colorado Highway 7 5’x7’ box culvert. <br /> <br />7.2.2 CROSS‐SECTION 1, Bike path and three 15‐inch culverts: Cross section 1 is at the bike path crossing over <br />the CH North Trib, immediately downstream of CO HWY 7. We surveyed the bike path profile for overtopping <br />analysis and the three 15‐inch HDPE culverts through the embankment. We surveyed a high water mark at <br />approximately 0.9 ft above the low point in the bike path. This gives reasonable agreement with a resident’s <br />account of about ½‐ft of water flowing over the bike path during the flood (see Section 5). Again using FHWA’s <br />HY8 we calculated: Peak flow=151 cfs at the surveyed high water elevation 99.24 (assumed survey datum). A <br />sketch of the culverts and summary results from HY8 are shown in Figures 14 & 15. <br /> <br />Figure 14: Surveyed bike path and three 15‐inch diameter HDPE culverts. Surveyed elevations for the bike path profile are <br />not shown.
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