20190668 Ver 1_Polk County - B 29 - Detour Hydro Report_20190522

DocuSign Envelope ID: C1AF8EF7-EOFO-4BA2-9B20-092019FOB193
DETOUR STRUCTURE SURVEY & HYDRAULIC DESIGN REPORT
N.C. DEPARTMENT OF TRANSPORTATION
DIVISION OF HIGHWAYS
HYDRAULICS UNIT
RALEIGH, N.C.
I.D. NO. 41665.3D
Project No. 41665.3D Proj. Station DET 21+01
County P01k Stream Z5ee auunwnai nuies Str. No.
On Highway NC9 Between SR 1550
Recommended 2 @ 84" CMP w/ temp. sandbag HW
Structure
and
29
SR 1525
Recommended Roadway Width22' (26' EOP to EOP) Skew 75
Recommended Location is (Up, At, Down) Stream from Existing Crossing Upstream
Benchmark isControl Point BM #2 @ BL Sta. 14+10.26 32.96' LT
Elev. 884.01 ft. Datum NAVD 88ft.
Superstructure Depth (3' assumed unless otherwise noted) N/A ft.
Recommended Grade Point at Structure 884.14 ft.
DESIGN DATA
Frequency
Discharge
Elevation (U/S)
Velocity (D/S)
10 yr.
890 c.f.s.
883.1 ft.
3.1 ft/s
SITE DATA
Drainage Area3.7 square miles Normal Water Surface Elev. 874.2 t,
Allowable HW Elev.883.2 (SAG at -DET- 21+50) ft.
ADDITIONAL INFORMATION
Stream is South Branch of Little White Oak Creek
2 @ 84" CMP not buried
Note: See attached drawing for any additional notes
Designed by: P. H. Cameron, P. E.
Assisted by:V. Wang, E.I.
Project Engineer: P.H. Cameron, P.E.
Reviewed by:`-
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