FLOOD00909

• County: Larimer
• Community: Wellington
• Stream Name: Boxelder Creek
• Title: An Evaluation of the Designation of the Town of Wellington as Being in the Boxelder Creek 100 year Floodplain
• Date: 6/3/1974
• Prepared For: Larimer County
• Prepared By: Marcus & Burns
• Floodplain - Doc Type: Floodplain Report/Masterplan

, ,

BOXHI.I1Ell CIWHK

EXlIl Hl1' I'

-

.

Cross Section 27
Analysis of flow at Flume with Flume thcorcr ie,IIly
rcmoved. West Inlet
Ea.st Outl1el t Win wall
Win wa ELEVATION OF T .... ,...,'
....: T, BOTTOM OF FLUME 105' ......
... ,," 8.3 ~ . 't....
_ ..i-_________________________ .
3_.7' I 28.5' . .....
27,S' 54.0 ...' ".:,'.0'
~ 'olio! . .... .:'~ ".CI'.. Co ':-: .::~:':::. :;:.::f; :.:;:~:.~:.::~......:Q..;..::.......~ ...._~...' ". ~~~<o. -::.. .

;-
I

A. Roughness Coefficient = 0.033

Slope

= 0,004

.

Total wetted perimeter; ll3,7 ft.

Total area

;

552 Square feet

v = 8,11
Average depth; 3,82 ft,

Hydraulic radius

=

4.85

Q ; 4474 cfs
c
(This is the flow at the
el evation of the bottom
of the flume.)

I
-

B, 2 foot higher
Wetted perimeter ; 117.7 ft, V ; 9.91
- 770 feet 5.8'2 ,ft.
Total area = square Depth ;
Hydraulic Radius = 6.54 Qc = 7633 cfs
. C, 2 foot higher
Wetted perimeter = 121. 7 ft. V = H.!H
Total area ; 983 square feet Depth = 7,82 ft.
Hydraulic Radius = 8,12 Q = 11,367 cfs
I- c
D. 2 foot higher
Wetted perimeter = 125.7 ft. V ; 12.86
Total area = 1206 square feet Depth . 9,82 ft.
I- Hydraulic Radius = 9.59 Qc ; 15,515 cfs
E~ 2.3 foot higher
Wetted perimeter = 130.3 ft. V = 14.26
-
Total area = 1457 square feet Depth ; 12.12 ft,
Hydraulic Radius ; ll,l8 Q ; 20,773 cfs
'This elevation corresponds to the top of the flume outlet wing wall on the
. east bank of Boxelder Creek.
--- -----