DFHADprototype071409.. - Urban Drainage and Flood Control District

DFHAD Prototype
VI.
Problem Areas
There are a number of homes in the effective floodplain.
Overtopping has occurred in larger events at Hoffman Way and 88 th Ave approximately 2
times in the last 20 to 30 years.
There may be a split flow near Devonshire causing some of the runoff to inundate the
railroad tracks or divert into the Niver creek watershed.
The Lower Clear Creek Canal currently intercepts the low flows in Hoffman Gulch. This is
not preferred by the canal company and has led to some minor flooding along the canal.
The portion of the drainageway along 86 th Avenue is unsafe for vehicles and very tight as far
as ROW is concerned. In addition, 86 th Avenue will likely be widened to 3 lanes in the
future.
Elm Place is a large contributing basin to the Hoffman drainageway and significant flooding
has occurred there in the past, however, Flood Hazard Area Delineation and development of
alternatives to improve pipe the conveyance for Elm Place are not included in the scope of
this study.
There are a number of utilities that will need to be considered during the alternatives
analysis. Utility maps will be obtained from the companies early in the alternatives analysis
phase. It has been observed that there are exposed utilities in the drainageway that need to
be addressed.
The design flows for the Lower Clear Creek Canal and the Colorado Agricultural Ditch are
150 cfs and 80 cfs respectively.
VIII. Next Meeting
The next progress meeting is scheduled for August 22 nd at 1:30 pm at the Urban Drainage
and Flood Control District’s office.
IX.
Action Items
• Moser & Associates will contact the City or Thornton to obtain GIS mapping.
• Pete Brezall will provide as-builts of the new CBC near the lower end of the study reach to
Moser & Associates
• Jessica will provide address list to Ken MacKenzie for public meeting by August 9 th .
• Moser & Associates will provide a floodplain boundary to Jessica.
• Moser & Associates will provide a brief description of the study area location to Ken
Mackenzie
• Besharah will provide documentation on the 90’ existing drainage easement along 86 th
Avenue. He will also try to provide documentation on the court ruling requiring the pipe
between Rainbow Street and Devonshire Street.
VII.
Public Involvement
A website will be maintained by Moser and Associates on the District’s server. This website
will explain the purpose of the project, the limits of the study, the progress of the work, and
provide an avenue for public comment.
A public meeting will be held to address concerns of the homeowners and business owners
in the area. The meeting will “Open House” style, with several short presentations. The
meeting is tentatively scheduled for Thursday September 14 th from 6pm to 8pm. Pete
Brezall and Gene Potter indicated that they would look into the availability of the Thornton
Civic Center meeting area for this meeting. (Pete has notified after the progress meeting
that September 14 th is not available and the public meeting was scheduled at Thornton Civic
Center for September 11, 2006)
A postcard will be mailed to all homeowners and business owners in the study limits
informing them of the project, the website and the public meeting. Jessica Murphy indicated
that she would provide names and addresses for the mailing to Ken MacKenzie. Teresa will
provide the limits of the watershed to Jessica.
Hoffman Drainageway Planning & FHAD
Kickoff Meeting Minutes 08/01/06
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Hoffman Drainageway Planning & FHAD
Kickoff Meeting Minutes 08/01/06
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