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DRAINAGE CRITERIA MANUAL
RUNOFF
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USE WITH THE RATIONAL FORMULA.
*MOST FREQUENTLY OCCURRING"UNDEVELOPED"
LAND SURFACES IN THE DENVER REGION.
REFERENCE: "Urban Hydrology For Small Watersheds" Technical
Release No. 55. USDA, SCS Jan, 1975.
5-1-84
URBAN DRAINAGE 6 FLOOD CONTROL DISTRICT
DREXEL, BARRELL & CO.
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(Pipel ND141
O
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2 1. Face ImrM
CONVENTIONAL ar BEVELED
INLET: FACE CONTROL SECTION
/
EL
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Face
Throat
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Inlet 5—�
Structure 1EI. Throat Invert
TAPERED INLET
THROAT CONTROL SECTION
(Lower Headings)
DEFINITIONS OF INLET CONTROL SECTION
(2) JX f3) (a) (5) 1 Note•. Use Upper Headings for
Cwentionol or Beveled Face;
Loner Headings for Tooered
Inlet Throat.
FALL I HWt I S I V. I COMMENTS
Trial NoInlet and Edge Description �O t� hfr `! 0•-1 ^'rrDl
V
I16.(D
ZS.�
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3•`l�
62
Trial No.7— Inlet and Edge Description T" "r1�=d :,, �pF -f//�;� c..l,� /o•
Trial No._3 Inlet and Edge Description
loco
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5
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Notes and Eabotions'
(1) El Face(of throat)lnvert • AHW EI.-Hf (ar Ifs)
(2)FALL- El. Stream Bed of Face- El. face (or throat) invert
(�HWt(or HWt)• fit(or Htl• El, face (or throat)
inert , where El lace (or throat)
.men should not eeceed Elstream bed.
SELECTED DESIGN
Inlet Description
FALL• " ft
Invu11 t El • �= it.
Bevels:
(a) S o Se' FALL/Le
Angle • —
(5) Outlet Velocity •O/Area defined by do of S
D•_m. d• in.
13-170
Z 3O
FA6-F 60/Y7-i4DL.
2
0
DESIGNER:SIDE-TAPERED INLET
DESIGN CALCULATIONS
TION: DATE:IAL
DAT4�• /e�PJ cfs S.. ozo
[AHW
SKETCHFACE EL—
EI. • flER •
Iand
Shape RC� -DJ13 aMaterial
Face Edge
Description
r
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(21
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(4)
(5)
Upper Headings far Box
Culverts, Loner Head for
E I.
Ttwoat
TL,'
EI•
Pipes
COMMENTS
Hf
0
Min.
0
Invert
E
A, E'12
E''Iz
q fBf5
Lf S
YNert
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(o>_�;
l!, l
/•23
3 2
l�7
/0,7
c,159
16.76
; B, D [pr A,E'2]•
v
Trial No. Z ,0• o•5i ,HWt- 2.3• /_'� •30. ZUL'
L:
/S
/,23
3.z
/�J.7/27(o
13
13
75/3[BID[rA,E112]
J
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/(o,/� SID ArEi'z]•
4t3
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/� czv c.�;f ,�tg< /
Notes and Equations: SELECTED DESIGN
(1) Itf/D[or f11/E]-(HWf-El. Throat Invert-I)/D[a E] 8te13 ft.
D sE s 1.1 D
O L,- / O h'
(2)
Min. Be -
(03/2)(O / 8fD3/21 Bevels: Angle a
O d --In, D•_in.
Min.Af• (E1 2)(— (2 E112
1 Crest Check:
f
(3)48[ —NBl TAPER HWc•—�'—ft.
J
(4) From throat design
(S) EI,Face Invert - E I.Throaf In vM � I M. , recompute.
Face and Throat may be lowered to better fit site, but do not rose.
13-171
0/W• 30 (Chart 17)
Min.W ZO ft.
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COLORADO SPRINGS, COLORADO 80907
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Chart 10
4.0
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Hf/D 2.0
1.0
CURVE APPLIES TO:
i. 18° TO 33.7' WINGWALL FLARE
WITH d=0.083 D.
2. 459 WINGWALL FLARE WITH
d=0.043 D.
HEADWATER DEPTH FOR INLET CONTROL YE
RECTANGULAR BOX CULVERTS
FLARED WINGWALLS 18` TO 33.7° AND 45- WITH
BEVELED EDGE AT TOP OFANLgT
TOP EDGE
BEVEL ANGLE
REQUIRED
d/D ANGLE
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0.083 180• 33.7
FACE
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TOP BEVEL d _
HEIGHT D IN FEE
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BEVEL ANGLE
LONGITUDINAL SECTION
0 2.0 4.
FEDERAL HIGHWAY ADMINISTRATION
0 6.0 8.0 10.0
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HEADWATER DEPTH FOR INLET CONTROL
RECTANGULAR BOX CULVERTS
FLARED WINGWALLS 18` TO 33.70 AND 45°
13-74 WITH BEVELED EDGE AT TOP OF INLET
Chart 14
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