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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47

Bear Canyon Creek

1. Sediment and debris have been maJor problems in the past on Bear
Canyon Creek, and precautions must be taken to insure against future
channel erosion, as well as debris from upstream of Table Mesa Drive.

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2. Bear Canyon Creek offers almost unexcelled opportunities for con-
necting University property below the Wellman Canal to the Williams
Village land, and then to the NCAR/Greenbelt land to the west.
Hiking and bicycle paths can be developed to South Broadway from
Boulder Creek, where the route would go up Table Mesa Drive to NCAR.
Connections to the Wellman Canal trai 1 system are also ideal.

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3. The channel location in the center of Table Mesa Drive was originally
dictated by the street designs. These unfortunate constraints still
exist and for that reason the final channel design in Table Mesa Drive
will need special attention to insure stability under design flows.

Viele Lake

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I. The development of Viele Reservoir as a recreational area has provided
very important and signiflcailt flood storage in the upper portion of
the basin.

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2. The extensive use of pondlng at the 47th Street Interchange location
has reduced the need for larger and more expensive culverts under
47th Street. The ponds will provide fill for the interchange, Proper
layout and construction of the ponds is an integral and important part
of the overall plan. The general ground water problems southwest of
the Turnpike and along South Boulder Road can be reduced with subdrains
dayllghted into the flood channel.

David's Draw

I. The plan for DavId's Draw is an example of low drainage costs where
planning is undertaken early enough.

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2. Flood plain zoning of David's Draw should be high on the priority list
of the City and County.

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3. Future development along David's Draw should fully respect this natural
easement, and bridges and culverts should be designed with great care
so as not to disturb the natural regime.

4. David's Draw should be observed in the future to determine whether or
not minor check dams are needed at particular locations to control
erosion or whether the natural armourlng will be sufficient.

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