FLOOD04864

• County: Teller
• Community: Woodland Park
• Stream Name: Paint Pony Gulch
• Basin: South Platte
• Title: An Investigation of the Flood Hazard on Paint Pony Gulch
• Date: 3/1/1987
• Prepared For: Woodland Park
• Prepared By: CWCB
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Flood Hazard
Page five

Summary of Discharqes
Flooding Source Drainage Area Peak Discharges (cfs)
and Location (Square Miles) 10-Year 50-Year 100-Year 500-Year
Paint Pony Gulch
at Confluence
with Loy Gulch 1.1 110 280 410 670
at Confluence
with East Fork
Paint Pony 0.4 40 80 120 180

Since the Flood Insurance Study is essentially in agreement
with the various hydrologic studies prepared by local engineers
for private development, it is assumed the current 100-year
flow on Paint Pony Gulch is 150 cfs above Kelley Road and 120
cfs downstream of Kelley Road. The decrease can be attributed
to the detention provided by the road embankment.

Kelley Road

The most significant change to the drainage basin is the
original construction of Kelley Road prior to at least 1954.
The net effect of this road is to concentrate flows that were
previOUSly dispersed. Whether it flows over the road or
through a culvert. water now must flow in the vicinity of the
subject site.

Our understanding is that on at least one occasion
subsequent to its construction. Kelley Road was raised, In any
event, most or all of the road changes took place prior to the
construction of the affected homes.

Water can cross under Kelley Road through an existing 48
foot long 29" x 18" pipe arch culvert by Mr. Kirvelevicius'
home and over the road via the low spot (recently surveyed
elevation of 8374.3) on the road just above the culvert. It
was noted that the December 1979 Master Drainage Plan by
Gilbert. Myers & Sams, Inc. shows this culvert to be a 25" x
16" pipe arch with a capacity of 8.2 cfs. The low point on the
road based on a May 1979 topographic map was elevation 8373.7.