FLOOD04641

• County: Denver
• Community: All
• Stream Name: All
• Basin: South Platte
• Title: Proposed Hydrology for use in Hydraulic Analysis of FEMA Flood Studies and Restudies
• Date: 9/1/1989
• Prepared For: State of Colorado
• Prepared By: Resource Consultants
• Floodplain - Doc Type: Educational/Technical/Reference Information

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TABIJ; 10.3 -=- SUMMARY OF SET DISCHARGES BY RCI
DRAINAGE AREA PEAK DISCHARGE(l) (cfsl
LOCATION (square miles) 10 YR 50 YR 100 YR 500 YR
SET 1 3.89 290 840 1,140 NA(2)
SET 2 5.20 520 1,320 1,740 3,300
SET 3 5.54 580 1,440 1,900 3,600
SET 4 5.63 600 1,470 1,930 3,700
SET 5 5.92 610 1,480 1,970 3,800
SET 6 5.92 610 1,480 1,970 3,800

(1) These values result from the 2-hour AMC III storm.
(2) The 500-year discharge was not determined for points outside the
study r,each.

PINE CREEK ~~D PINE CREEK TRIBUTARY HYDROLOGY

11.1 Watershed Description

The Pine Creek (PC) and Pine Creek Tributary (PCT) basins are
located in north Colorado Springs adjacent to the intersection
of Interstate 25 and Academy Boulevard (State Highway 83). As
shown in FIgure 11.1, the two basins are primarily east of
rnterstate 25 with a majority of the contributing area north
and east of Academy Boulevard. The general direction of flow
through these watersheds Is southwest. The hIghest elevation
occurs :In the northeastern corner of the PC basin at 7,400 feet
with a slope of approximately 22%. Elevation at the confluence
to Monument Creek is 6,280 feet. Average slopes throughout the
basins are approximately 3 to 5%.

For purposes of this study, the PC basin has been defined as
that arE!a of the watershed contributing to flow accumulatIng in
the Pine Creek Channel at the culvert crossIng under Academy
Boulevard (point P8 on Figure 10.1). Total area of thIs basin
is 5.0 square miles. Consisting of broad sloping plains and
rolling hills, this area is virtually undeveloped at the
present time. Vegetated with native grasses, it has
historIcally been used for ranching operations.

The remainder of the watershed has been desIgnated the peT
basin. Total area of this southern basin is 4.99 square miles.
It is slightly lower in elevation than the PC basin but also
consists of sloping plains and rolling hills. Aggressive
development has occurred in this area over the past 5-10 years.
Many commercial interests are now located along Academy
Boulevard, the largest of these being the Chapel Hills Mall
complex. Several office parks have been built north of the
Mallon Jamboree DrIve and Jamboree Circle. The eastern and
northern portions of the basin are residential; there is still
quite a bit of open space existing in these areas in the form
of desig,nated parkland and undeveloped lots.

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