ST9905DR-CS040202 (2)sPROF
ERVIi
P.O Box 5000 · Little Elm
F
CRAIG OLBEN INC,
SSIONAL
ES, LP
(FA×)972 294 5000
P, O01'OOt
Earth Retention Engineen'ng
Texas 75058 * Dallas 972-294-5000 * 1-800-422-4667! * Fax 972-294-2664 J
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10:25 CRAIG OLDEN INC, IFAX)972 294 56fl6 P,BBZ,BBt
£xamp/e o£ soil
G wEN:
Trapezoidal channel ha~
The channel is lined wit
F~nd the velocity and di,'
SOLUTION:
(10 + 18)
Flow area ==- 2
GABION UNED CHANNEL
~on of IVlanning'$ Formu/a:
bottom width ~-- 10 fee~, side slopes 1 on 2, depth of flow = 2 feet, slope ~ 0.5%,
gabions filled with stone having a mean size of ~-'.
harge in the channel.
2 = 28 square feet
We~ed Perimeter ~- 10 2 (~/2= + 4~) ---- [9 feet.
Hydraulic Radius = A 28/19 ---- 1.5 feet.
Since hydraulic radius i iess than 5 feet, the roughness factor ef ~.he gablons
;s obtained from the grai ).028
Fram the Cha~
1) Locate the intersec~i
2) Follow the diagonal
3} Proceed vertically
D~scharge, Q = AV
of R = 1.5 and $ = 0.5%
e to the intersection of n = ,028
3 of chart to find V = 4.9 fps
137 cfs
.035
VARIATION OF MANNING'S "n" WITH SIZE OF STONE
FILL
% .0~ 1
= .030
"~ .029
,027
.026
0.025
4" $- 6' 7' R- 9'
$1Z£ nF STONE F1LL
than about 5 feet. 3 constant value ef 0.025 for "n" m~y be used ;f the
10:25 CRAIG OLDEN INC, (FA×)972 294 5000