HY-8 Culvert Analysis Report
23rd Avenue 20” x 28” CMP Pipe
(Equivalent to a 24” CMP Pipe)

Notes:
•	Pipe modeled from as-builts and survey.  The inlet is in sump and has a trash rack.  Currently there is debris on the rack.  Per COA standards, a 50% clogging factor is applied.  However, to be conservative the offsite flow of OFF-3 is used as the flow, which is 16 cfs.  

Site Data - 23rd Avenue Culvert
Site Data Option:  Culvert Invert Data
Inlet Station:  0.00 ft
Inlet Elevation:  5223.34 ft
Outlet Station:  250.00 ft
Outlet Elevation:  5215.49 ft
Number of Barrels:  1
Culvert Data Summary - 23rd Avenue Culvert
Barrel Shape:  Circular
Barrel Diameter:  2.00 ft
Barrel Material:  Corrugated Steel
Embedment:  0.00 in
Barrel Manning's n:  0.0240
Culvert Type:  Straight
Inlet Configuration:  Square Edge with Headwall
Inlet Depression:  None

Table 1 - Culvert Summary Table: 23rd Avenue Culvert
Total Discharge (cfs)	Culvert Discharge (cfs)	Headwater Elevation (ft)	Inlet Control Depth (ft)	Outlet Control Depth (ft)	Flow Type	Normal Depth (ft)	Critical Depth (ft)	Outlet Depth (ft)	Tailwater Depth (ft)	Outlet Velocity (ft/s)	Tailwater Velocity (ft/s)	 
 0.00	0.00	5223.34	0.000	0.000	0-NF 	0.000	0.000	0.000	0.000	0.000	0.000	 
 2.40	2.40	5224.06	0.721	0.0*	1-S2n	0.436	0.534	0.436	0.228	4.581	0.000	 
 4.80	4.80	5224.39	1.047	0.0*	1-S2n	0.622	0.765	0.622	0.412	5.562	0.000	 
 7.20	7.20	5224.67	1.335	0.0*	1-S2n	0.772	0.953	0.772	0.508	6.218	0.000	 
 9.60	9.60	5224.94	1.600	0.0*	1-S2n	0.906	1.104	0.906	0.588	6.712	0.000	 
 12.00	12.00	5225.20	1.862	0.0*	1-S2n	1.033	1.239	1.033	0.660	7.095	0.000	 
 14.40	14.40	5225.48	2.137	0.0*	5-S2n	1.158	1.363	1.158	0.726	7.401	0.000	 
 16.00	16.00	5225.67	2.334	0.0*	5-S2n	1.242	1.437	1.242	0.770	7.569	0.000	 
 19.20	19.20	5226.11	2.771	0.913	5-S2n	1.422	1.574	1.422	0.850	7.811	0.000	 
 21.60	21.60	5226.49	3.146	2.809	5-S2n	1.585	1.661	1.585	0.870	7.884	0.000	 
 24.00	23.54	5227.35	3.481	4.011	7-M2c	2.000	1.721	1.721	0.870	8.183	0.000	 
 
* Full Flow Headwater elevation is below inlet invert.
********************************************************************************
Straight Culvert
Inlet Elevation (invert): 5223.34 ft,    Outlet Elevation (invert): 5215.49 ft
Culvert Length: 250.12 ft,    Culvert Slope: 0.0314
********************************************************************************

Culvert Performance Curve Plot: 23rd Avenue Culvert

Water Surface Profile Plot for Culvert: 23rd Avenue Culvert

Table 2 - Downstream Channel Rating Curve (Crossing: 23rd Avenue Culvert)
Flow (cfs)	Water Surface Elev (ft)	Depth (ft)	Velocity (ft/s)	 
 0.00	5215.49	0.00	0.00	 
 4.00	5215.87	0.38	0.00	 
 8.00	5216.03	0.54	0.00	 
 12.00	5216.15	0.66	0.00	 
 16.00	5216.26	0.77	0.00	 
 20.00	5216.36	0.87	0.00	 
 Tailwater Channel Data - 23rd Avenue Culvert
Tailwater Channel Option:  Enter Rating Curve
Channel Invert Elevation:  5215.49 ft
Roadway Data for Crossing: 23rd Avenue Culvert
Roadway Profile Shape:  Constant Roadway Elevation
Crest Length:  100.00 ft
Crest Elevation:  5227.34 ft
Roadway Surface:  Paved
Roadway Top Width:  100.00 ft

Crossing Discharge Data
Discharge Selection Method: Specify Minimum, Design, and Maximum Flow
Minimum Flow: 0 cfs
Design Flow: 16 cfs
Maximum Flow: 24 cfs

Table 3 - Summary of Culvert Flows at Crossing: 23rd Avenue Culvert
Headwater Elevation (ft)	Total Discharge (cfs)	23rd Avenue Culvert Discharge (cfs)	Roadway Discharge (cfs)	Iterations	 
 5223.34	0.00	0.00	0.00	1	 
 5224.06	2.40	2.40	0.00	1	 
 5224.39	4.80	4.80	0.00	1	 
 5224.67	7.20	7.20	0.00	1	 
 5224.94	9.60	9.60	0.00	1	 
 5225.20	12.00	12.00	0.00	1	 
 5225.48	14.40	14.40	0.00	1	 
 5225.67	16.00	16.00	0.00	1	 
 5226.11	19.20	19.20	0.00	1	 
 5226.49	21.60	21.60	0.00	1	 
 5227.35	24.00	23.54	0.38	49	 
 5227.34	23.53	23.53	0.00	Overtopping	 
 
Rating Curve Plot for Crossing: 23rd Avenue Culvert