HomeMy WebLinkAboutAGENDA REPORT 1994 0518 CC REG ITEM 08FITEM F. F. �
AGENDA R E PORT
G =TY OF MC7C3RPARK
TO: The Honorable City Council C FROM: Kenneth G1 be , 1 rt Director of Public Works �`
DATE: May 10, 1994 (Council Meeting 13- 18 -94)
SUBJECT: Consider Approval of a Hydrology Report
Prepared for the Arroyo Vista Community
Park Pedestrian /Equestrian /Bicycle
BACKGROUND
1. In April of 1993 the City Council retained the services of VCE,
Inc. to prepare the design for the Equestrian / Pedestrian
Bridge for Arroyo vista Community Park.
2. In August of 1993 the City Council approved an amendment to that
contract to expand the scope of work to include the preparation
of soils reports required for t!ie preparation of the design.
3. In February of 1994 the City C'uunc;il approved an amendment to
that contract to include thr• preparation of the subject
hydrology report.
DISCUSSION
A. Floodplain Boundaries
The present channel and levie_, for the Arroyo Simi will not
contain storm flows from a i00 -year storm. The Federal
Insurance Rate Maps ( FIRM) for the City of Moorpark show an area
along the north and south sides of the Arroyo which are within
the boundaries of a 100 -year storm and thus susceptible to
inundation.
B. Channel Widening Project
The Ventura County Flood Controi District (VCFCD) is developing
a channel improvement project for a portion of the Arroyo Simi,
which includes the area where the Arroyo Vista Community Park
pedestrian / equestrian bridge is to be constructed. When that
project is completed a 100 -year storm will be contained within
the channel.
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Ped Bridge Hydrology
May 1994
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C. Bridge Design Parameters
The VCFCD channel improvement project calls for the lowering of
the water level at the planned location for the pedestrian
bridge. The design parameters for the pedestrian bridge are
based on the proposed channel widening improvement project, and
as such, calls for the construction of the bridge in a manner
which will be compatible with the future ultimate channel
widening project.
The proposed lowering of the water surface by the channel
improvement project enables the City to design and construct a
pedestrian bridge which is both shorter and lower than what
would be required if no channel modifications were being
planned. The resultant bridge project is more functional, more
compatible with surrounding properties and less expensive than
a longer and higher structure.
In light of the above, the pedestrian bridge design calls for
the elevation of the soffit (bottom) of the bridge to be lower
than the current elevation of a 100-year storm at the bridge
location. This factor, combined with the construction of a
slightly elevated bridge access roads and levy maintenance
roads, will have the effect of creating an obstruction to storm
waters flowing at and slightly lower than the 100-year flood
elevation at this location.
D. Hydrology Report
The City Council authorized the preparation of the subject
hydrology report to assess the potential flood impacts of
proceeding with the construction of the pedestrian bridge prior
to the channel improvements. A copy of this report has been
provided to the City Council under separate cover.
E. Conclusions of Report
Based on the findings set forth in the subject hydrology report,
it is the conclusion of the project engineer, V.C.E. , Inc. that
the proposed project will have an insignificant impact on the
flood plain of the Arroyo Simi.
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Ped Bridge Hydrology
May 1994
Page 3
RECOMMENDATION
Staff recommends that the City Council accept the subject Hydrology
Report and authorize staff to proceed with the project design and
right-of-way acquisition required for the construction of the
Arroyo Vista Community Park Pedestrian / Equestrian / Bicycle
bridge.
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