FLOOD08913

• Designation Number: 203
• County: Larimer
• Community: Fort Collins
• Stream Name: Dry Creek
• Basin: South Platte
• Title: Major Drainageway Planning - Dry Creek, Fort Collins, Larimer County, Colorado
• Date: 4/1/1980
• Designation Date: 1/1/1983
• Floodplain - Doc Type: Floodplain Report/Masterplan

TABLE XIV

BENEFIT:COST, STUDY AREA

Benefits
Benefits Costs Costs Benefits - Costs
Alternative #l 5,497,600 4,914,OO(l 1.12 583,600
Alternative " 5,497,600 6, ~92, 000 0.S5 3. 30 shallow flooding areas, .11 structures must be
Alternative !3 5,497,600 12,639',000 0.43 elevated . minimum of two-feet.
Alternative 15 5,124,700 4,401,300 1.16" 723,000

4. For Items 2 and 3 above, no more than 50% of the are~
within the flood fringe perpendicular to the path of
flow may be obstructed on any individual lot. This is
illustrated below on Figure 8.

Alternative *6
An additional alternative that should be considered for drainageway
planning in the Dry Creek basin is the non-structural alternative
in developed areas. Flood plain management practices would guide
future development in currently undev~loped areas and would guide or
prevent further construction in developed flood plain areas.
This type of plan would do little to alleviate or mitigate
existing flood potential and, hence, damage potential. With
this plan, an average annual damage of $436,100 can be expected
to occur over a long period of time.

FIGURE 8
Property that may
be developed

Flow path

0<

i
\
\

Areas available
for development

With this plan, the City of Fort Collins and Larimer County
would develop and enforce flood plain ~egulations based upon
flood plain and floodway boundaries presented in this report
(Sheets 2-7). The following are recommended development
quide1ines in these flood plain areas south of the Larimer-Weld Canal.

FIOl," Path

Areas to
remain
unobstructed

Areas of Existing Development
1. No further construction would b~ p~rmitted within
floodway are4S derined in this report (Sheets 2 - 7),

)
../

Property with no development
permitted

2_ In flood fringe areas, <.:<efined as :1=0: plain outRide th,.
li~its of the flooJway, all new structures must be elevatec
lU' above the IOO-year water survace elevation pr8sented in
thi,; report,

5. For Items 2 and 3 above, no eontinuom; flood fringe
obstruction perpendicular to the flood plain ma'/ exceed
ISO-feet in width, and a continuous flow path onto
adjacent properties must exist and be idc~tified.

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