FLOOD04566

• County: Boulder
• Community: Boulder
• Stream Name: Gregory, Bear Can, Bluebell Can Creeks, Viele Chan
• Basin: South Platte
• Title: Major Drainageway Planning Volume 1, Part C
• Date: 9/1/1970
• Prepared For: Boulder County
• Prepared By: CWCB
• Floodplain - Doc Type: Floodplain Report/Masterplan

I

I
I
I
I
I

I

I

I
I
I

I

I

I

I

I

I
:1

:1

KENNETH R. WRIGHT

X
431
y..,,\Y'So
lJ, I

RONALD C. McLAUGHLIN

WRIGHT.McL....UGHL.IN ENGINEERS
ENGINEERING CON8ULTANT8
20511 ."VANT STREET
DP!NVER, CDLOftADO 80211
TEL.EPHONE .33.8201

SERVING . . '.
MUNICIPALITIIES
INDUSTIIY
WATItR A;ND SANITATION DISTRICTS

12 September 1970

WATER .U....Ly AND DISTRIBUTION
WATER TREATMENT WORKS
SEWAGE COLLECTION AND DIS.,OSAI..
IHDUSTlUAL WASTES
STORM DRAINAGE FACILITIES AND
OTHER WATER ORIENTED ""DJECTS

Mr. T. K. Dieffenderfer
Director of Operations
City of Boulder
P. O. Box 791
Boulder, Colorado 80302

Re: South Boulder Major Drainaqeways

Dear Mr. Dieffenderfer:

The report entitled
Boulder," in two volumes
with Purchase Order Nos,

"Urban Storm Drainage Major Drainageways Planning, South
is attached. The assignment was undertaken in accordance
94, 1324, and 1393,

The Master Plan represents major drainageways having 12,1 square miles of tribu-
tary basin and lengths of 13.67 miles. The drainageways are extensive, and the effort
needed to develop them will be large. The final decision on whether or not to proceed
with the work is very properly a decision of the residents. However, no reasonable
decision can be made without having the facts at hand, and this would include the
financing strategy as well as the alternate to the drainageways, i ,e., no work. Photos
from May of 1969, some of which are in this report, would be useful in understanding
the latter,

Most of the drainageways covered in this report are theoretically under the
jurisdiction of the Urban Drainage and Flood Control District, which was created by
an Act of the State Legislature in 1969. It is recommended that you coordinate the
City's efforts, and those of the County of Boulder, with Mr, James Quinn, Executive'
Director of the District.

The Master Plan utilized fully the Urban Storm Drainaqe Criteria Manual, both
in pol icy and in technical criteria. The environmental design team employed for
South Boulder drainage included Dr. John Sheaffer, Mr. Joe Shoemaker, and the writer,
all of whom were involved in the preparation of the Drainaqe Manual.

The drainage basins in South Boulder consist of about 46 percent of greenbelt
and mountain park land plus some rural development land in Bear Canyon Creek basin.
The benefits derived from the City's having purchased the greenbelt land in recent
years are substantial from the drainage standpoint because, had these lands been
urbanized or if these lands were subject to urbanization, the drainage and flood
control problem downstream of the greenbelt lands would be considerably more exten-
sive and complicated. It is particularly fortuitous that the greenbelt lands were
acquired in the upper reaches of the basins and prior to the preparation of this
Master Plan.

The plan for major drainage in South Boulder was developed with strong considera-
tion given to multi - use -- multi - purpose concepts. These concepts include
controlled ground water tables, lower cost streets, improved traffic flow, better