FLOOD06195

• County: Statewide
• Community: State of Colorado
• Basin: Statewide
• Title: Measurment of Peak Discharge at Culverts by Indirect Methods
• Date: 6/1/1968
• Prepared By: G.L. Bodhaine
• Floodplain - Doc Type: Educational/Technical/Reference Information

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MEASUREMENT OF, PEAK DISCHARGE AT CULVERTS BY INDIRECT ~IETHODS 23

~y Slape=: X:Y

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A
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Bar and steel fabric
reinforcement

LONGITUDINAL SECTION

END VIEW

tn'nf:::='--~ [

I
I
,
I
1_________
,

E

\:\. Tongue end on inlet
\ end section
Groove end on outlet
end section

,

PLAN VI EW

j----4:1 Slo
oe-------.,3"J
f' SlODe ~;.
_ :J/?>"<>.o Normal
--- __ ~ shoulder
Culvert End sectio~", - -- ~_slope

If

Planned culvert length I End section--j
TYPICAL SLOPE DETAIL

Figure S,-Dimensions of flared end sec,ions for reinforced concrete pipe.
Selected dimensions for various diameters of pipe

Diam A II C D E
(in) (It in) (It in) (It 'n) 1ft 'n) (It ill)
t2 0 . 2 0 . 010 0 010 2 II
15 0 0 2 3 3 10 0 1 " 0
18 0 0 2 3 3 10 " 1 3 Il
21 0 0 3 II 3 IJ> " lJ> 3 ,;
,.. 0 OJ> 3 ,"' 2 0 " lh! . 0
27 0 10J> . I", 2 Il " I", . 0
30' 1 0 . 6 1 ir.i 6 Hi , 0
36 I 3 , 3 2 111li , I~ 6 0
" 1 , , 3 2 II , 2 6 0
.. 2 0 6 0 2 . , 2 , 0
" 2 3 , , 2 OJ{ , 2~ , 6

.Overalllength (D) of Iowa design is 8 it IH In for 241n and 8 it IX in for 30 in.
NOTE.-Slope3:1 for all sizes except 54 in. which 1s 2.4: I.

5. Compute Q from equation 5. Generally this
computed Q will closely check the as-
sumed Q from step 3. If it does not, repeat
steps 2-5, using [hl+",V,'/2g-h,,_,J for
[h,] in step 2,
When the two discharges check within I
"ercent, the final result may be considered
satisfactory,

Pipe-arch sections
Type I flow in 11 riveted ripe-arch is com-
puted in exactly the S11me steps as for 11 cire-ular
seetion by \Ising the pipe-arch dat.a in figures
9 and 10, Not all multipl11te pipe-are-hes are
geometrically similar to riveted pipe-arches or
to eae-h other, Therefore the e-urves of figure,
9 and 10 will provide less accur11te values,