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

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The plans are of sufficient accuracy to be used for cost estimates and
acquisition of rights-of-way. A very important aspect of the master
plan is to allow design of specific sections with assurance that the
construction will be compatible with future design in other areas, thus
rendering phased construction possible and practicable,

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Even if structures matching those contemplated in the report are used
for final design, major changes in the conditions shown on the master
plan may occur. Therefore, the plan should be updated to reflect each
new stage In construction.

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Any major changes in final design, such as increasing velocity in a
channel, may result in major modification to the master plan being
necessary. Downstream design discharges may be increased, or upstream
storage requirements increased to maintain discharge values at the fig-
ures originally contemplated. In any event a careful analysis must be
made to evaluate necessary modifications which may be caused by major
final design changes.

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Accuracy of Mappinq.

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The accuracy of the Drawings presented is compatible with the require-
ments of master planning and fiood plain definition. All base mapping
was made specifically for this assignment, and has two-foot contour
in te rva Is.

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Greenbelt Use.

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In addition to providing a needed outfall for drainage originating in
the urbanizing area, the channels have significant potential for green-
belt purposes. The City should consider including some of the water-
ways in its greenbelt program.

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The entire master plan should be reviewed from the standpoint of future
greenbelt, open space, and recreation needs of the community. Wherever
possible, joint uses should be identified and included in detailed plan-
ning and programs. These true benefits need to be analyzed and accounted
for in the financing strategy.

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Master Plan Summary

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The Master Plan for Major Drainageways in South Boulder as described in
this section of the report and as shown on the drawings would represent
a very significant and major undertaking in the Boulder area. While
critics would probably say that the planner was too ideal istic and per-
haps too optimistic In bel ieving that such a plan might ever be under-
taken, the point needs to be made that the master planning fits the pol icy
and design criteria of the Urban Storm Drainaqe Criteria Manual, Further-
more, it must be real ized that too I ittle ideal istlc and optimistic
planning for our urban areas throughout the United States has been done
in the past.

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