FLOOD08875

• County: Boulder
• Basin: South Platte
• Title: Analysis of a High Hazard Flood Zone
• Date: 10/1/1987
• Prepared For: Boulder
• Prepared By: David Love & Associates
• Floodplain - Doc Type: Floodplain Report/Masterplan

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

Product Number as a Function of
Weight and Stance

10

......._.......__.............~...... ~~~~;;;;"". .............~....~vv. .......................~
........
:ff..... ",,"
h-' ..~.
" "
A' ,
"
Wt:60/St: 1.0
. .~...............
..............._.............~._....... .......................................... ... Wt: 150/St: 1.5
- Wt:2 10/St:2.0

p
r
o
d
u 5
c
t

.,

o
o

2
Depth

Figure 15

As was mentioned previously, this analysis assumes that the individual does not try to "lean into
the flow" in order to resist the toppling moment. To test the sensitivity of this factor, the monolith
was modeled with an increased base thickness, as if the monolith were placing one foot forward,
and one foot back. This "resistive stance" results in a larger moment about point "0" (Figure 5)
available to the monolith to resist the force of the flood flow (P). The thickness due to this stance
was assumed to be 1 foot for a 60 pound individual, 1.5 feet for a 150 pound individual, and 2 feet
for a 210 pound individual (Figure 15)

Product Number as a Function

of Face Width

3

4

10

- Bose PN
....................m.................... .......................................... ..........................................
... FW:.75
" :~~~::~~~~.....v.
,~ - Fw: 1.25
.---. " ...
" ..............
" 'h
. ./ . .......
-- .......
. -y ---- ".
-- ~ ........
........... ""--
"'- "
""

p
r
o
d
u 5
c
t

.,

o
o

2
Depth

3

4

Figure 16

Another area of sensitivity to the product number curves is seen by varying the area normal to the
flows (An) (Figure 16). This was accomplished by varying the face width of the monolith from 9
inches to 15 inches (.75 feet to 1.25 feet). These values were chosen to reflect the difference in leg
width from children (9 inches from 30 to 90 pounds) to medium adults (12 inches from 120 to 180
pounds) and larger adults (15 inches from 210 to 240 pounds). These geometry configurations
were used to study the effects of weight variations to produce a family of curves for consideration
in using the product number in the delineation of flood hazard.
-13-