FLOOD08154

• County: Adams
• Community: Westminster
• Stream Name: Big Dry Creek
• Basin: South Platte
• Title: Master Drainageway Planning Study
• Date: 3/1/1973
• Prepared For: Westminster
• Prepared By: UDFCD
• Floodplain - Doc Type: Floodplain Report/Masterplan

1-2

were allowed to make decisions on an alternative to be dealt with in detail
in the second phase. Phase B then became the detai led master planning and
report preparation phase of the contract.

An out line of the Scope of Work I '; as fo lIoNs:

A. Development of alternative plans.

I. Meet wi th I oca I governmenta lent i ty ,'eprllsentat i yes on future
land planning, coliect basic d'lta, and maintain contact with the
United States Corps of EngIneers.

2. Perform hydrological studies for 5, 25, and llJO-year recurrence
intervals, and prepare flood hydrographs. Also estImate annual
flood damages and perform appropri,ate hydraulic computations.

3. Review right-of-way aspects relatIve to flood hazard,

4. Determine various potential alternate solutions and analyze for
costs and benefits.

5. Review legal aspects of plans and present flooding hazard,

6. Prepare a short written report to summarize Phase A work prior
to Phase B work.

B. Prel imlnary Design.

J. Prepare final hydrological studies to determine the magnitude
and volume of flood runoff for design purposes.,

2. Develop des Ign criteria for the subject project.

3. Process suitable topographic mclpplng having a I" ~ 200' scale
with a contour intervals of two FeE,t for plan and p,"ofile purposes.

4. Develop the approximate channel and flood pLaIn requirements for
review by local officials.

5. Prepare plan and profiles of the stream channel and flood plain
complete with flood profIle water s,urface elevations.

6. Prepare preliminary desIgn drawings wIth a suitable written report.

BASIN PROBLEMS AND OPPORTUNITIES

The Big Dry Creek basin Is the largest urban basin undertaken to date
for master planning by the District. At thO! pres"nt time it: is mostly