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The project consisted of revising hydrologic and hydraulic models of
three watersheds, Cherry/Red Fork Creek, Dirty Butter Creek and Flat Rock
Creek to assist the City of Tulsa in the preparation of Letters of Map
Revision (LOMR) to the Federal Emergency Management Agency (FEMA). The
work included collection and review of existing data, including the current
hydrologic and hydraulic models, current floodplain and floodway maps
and plans of flood control and channel improvement projects which had
been constructed in these three watersheds.
The models were revised to reflect the conditions created by the improvement
projects. The revised models generated new storm discharges and floodwater
surface elevations which were used to update current floodplain and floodway
maps which served as the basis for the LOMR application.
The FEMA approved HEC-1 models of the watersheds were revised to reflect
improvements and peak runoff discharges for the 10-, 50-, 100-, and 500-year
frequency floods, and were developed using the U.S. Army Corps of Engineers
rainfall distributions and amounts. Where HEC-1 models were unavailable,
existing data was used to reconstruct these models.
After review of appropriate data, maps, and construction drawings of improvements,
the FEMA approved HEC-2 model was updated in order to establish revised
water surface elevation profiles for the 10-, 50-, 100, and 500-year frequency
floods. The floodplain work maps were then red-lined to present the modified
100-year and 500-year floodplain boundaries. The floodway boundaries were
then developed using the HEC-2 model and were plotted on the floodplain
work maps.
Floodwater profiles were then prepared, showing the 10-, 50-, 100-, and
500-year floodwater elevations, in FEMA accepted standard format.
Finally, red-lined floodplain maps and floodwater profiles were prepared
for all proposed FEMA map revision areas within the study areas. Final
maps, profiles, and necessary supporting documentations were delivered
to the City for transmittal to the FEMA. Responsibility for fulfilling
all the requirements of the FEMA remained with the firm until final approval
by the FEMA.
Project List
The firm designed repairs to the Shell Creek Spillway channel which
was severely eroded.
To set the design flow rate, the Maximum Probable Flood was calculated.
The design of the channel and flume were set to accommodate that flow.
The flume had a vertical drop of thirty feet at a 2:1 slope.
The structural design for the reinforced concrete flume and energy dissipater
were done in-house. The design was coordinated with and reviewed by the
Oklahoma Water Resources Board.
General services included assistance during bidding, bid tabulation, recommendation
of award, Pre-Bid and Pre-Work conferences, shop drawing review, periodic
inspection, pay request review, final inspection and record drawings.
Project List
The project consisted of revising hydrologic and hydraulic models of
Dirty Butter watershed and assisting the City of Tulsa in the preparation
of a Letter of Map Revision (LOMR) to the Federal Emergency Management
Agency (FEMA). The work included collection and review of existing data,
including the current hydrologic and hydraulic models, current floodplain
and floodway maps and plans of flood control and channel improvement projects,
which have been constructed in the three watersheds.
The models were revised to reflect the conditions created by the improvement
projects. The revised models generated new storm discharges and floodwater
surface elevations, which were used to update current floodplain and floodway
maps which were the basis for the LOMR application.
The FEMA approved HEC-1 models of the watersheds were revised to reflect
improvements and peak runoff discharges for the 10-, 50-, 100-, and 500-year
frequency floods, and were developed using the U.S. Army Corps of Engineers
rainfall distributions and amounts. Where HEC-1 models were unavailable,
existing data was used to reconstruct these models.
After review of appropriate data, maps, and construction drawings of improvements,
the FEMA approved HEC-2 model was updated in order to establish revised
water surface elevation profiles for the 10-, 50-, 100, and 500-year frequency
floods. Floodplain work maps were then red-lined to present the modified
100-year and 500-year floodplain boundaries. Next, the floodway boundaries
were developed using the HEC-2 model and were plotted on the floodplain
work maps.
Floodwater profiles were then prepared, showing the 10-, 50-, 100-, and
500-year floodwater elevations, in FEMA accepted standards format.
Finally, red-lined floodplain maps and floodwater profiles were prepared
for all proposed FEMA map revision areas within the study areas. Final
maps, final profiles, and necessary supporting documentation was delivered
to the City for transmittal to FEMA. Responsibility for fulfilling all
the requirements of FEMA remained with the firm until final approval by
FEMA.
Project List
The project consisted of revising hydrologic and hydraulic models of
Flatrock Creek watershed and assisting the City of Tulsa in the preparation
of a Letter of Map Revision (LOMR) to the Federal Emergency Management
Agency (FEMA). The work included collection and review of existing data,
including the current hydrologic and hydraulic models, current floodplain
and floodway maps and plans of flood control and channel improvement projects
which have been constructed in the three watersheds.
The models were revised to reflect the conditions created by the improvement
projects. The revised models generated new storm discharges and floodwater
surface elevations which were used to update current floodplain and floodway
maps which were the basis for the LOMR application.
The FEMA approved HEC-1 models of the watersheds were revised to reflect
improvements and peak runoff discharges for the 10-, 50-, 100-, and 500-year
frequency floods, and were developed using the U.S. Army Corps of Engineers
rainfall distributions and amounts. Where HEC-1 models were unavailable,
existing data was used to reconstruct these models.
After review of appropriate data, maps, and construction drawings of improvements,
the FEMA approved HEC-2 model was updated in order to establish revised
water surface elevation profiles for the 10-, 50-, 100, and 500-year frequency
floods. Floodplain work maps were then red-lined to present the modified
100-year and 500-year floodplain boundaries. Next, the floodway boundaries
were developed using the HEC-2 model and were plotted on the floodplain
work maps.
Floodwater profiles were then prepared, showing the 10-, 50-, 100-, and
500-year floodwater elevations, in FEMA accepted standards format.
Finally, red-lined floodplain maps and floodwater profiles were prepared
for all proposed FEMA map revision areas within the study areas. Final
maps, final profiles, and necessary supporting documentations were delivered
to the city for transmittal to FEMA. Responsibility for fulfilling all
the requirements of FEMA remained with the firm until final approval by
FEMA.
Project List
A series of four ponds were designed to prevent flooding in a developed
area due to the runoff from an upstream area which was being developed.
Total drainage area was approximately 400 acres. The system included two
wet ponds and two dry ponds. The wet ponds were designed as design features
to enhance the appearance of the area.
All of the hydrograph generation and pond and stream routing routines
were computer generated using the SCS method. Discharge structures were
designed as trapezoidal weirs using a concrete template and riprap for
erosion protection.
Using the information from backwater curves, building pad elevations were
set for the residences along the drainage course for protection against
the 100-year flood.
The firm coordinated with an aerial photography company to produce a contour
map of the project area for use in design. The firm's survey crews provided
controls and performed all layout and construction staking.
Project List
One pond was designed to detain the stormwater runoff from our client's
46 acres, 20 acres being designed concurrently as a residential subdivision.
The design of the pond took into consideration the development of the
remaining 26 acres as single-family residential density.
All of the hydrograph generation and pond and stream routing routines
were computer generated using the SCS method. Discharge structures were
designed as trapezoidal weirs using a concrete template and riprap for
erosion protection.
The firm's survey crews provided a topographic survey, controls and performed
all layout and construction staking.
Project List
Work on this project was performed as part of the site and grading plans
for the modernization of the shopping center.
This project lies in a watershed that is subjected to flooding and therefore
detention was required by the City of Tulsa.
The design of this facility required that we consider the limitations
on space, and the existing flood plain water surface elevations. These
problems were solved using concrete slopewalls on the interior of the
pond and designing a discharge structure which would allow the elevated
flowlines to meet City of Tulsa criteria.
Detention routing was done using the Corps of Engineers' HEC-1 software.
Project List
A series of four ponds were designed to prevent flooding in a developed
area due to the runoff from an upstream area which was being developed.
Total drainage area was approximately 400 acres. The system included four
wet ponds. The wet ponds were designed as design features to enhance the
appearance of the area.
All of the hydrograph generation and pond and stream routing routines
were computer generated using the SCS method. Discharge structures were
designed as trapezoidal weirs using a concrete template and riprap for
erosion protection.
The firm's survey crews provided controls and performed all layout and
construction staking.
Project List
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