Exh 8G.,'
AGENDA ITEM NO. Q CT
DATE: Z - I~ -
CITY OF ATLANTIC BEACH
CITY COMMISSION MEETING
STAFF REPORT
AGENDA ITEM: Filling Regulus Drive
SUBMITTED BY: Robert S. Kosoy, P.E., Director of Public Works
DATE: February 8, 2000
BACKGROUND: In order to determine the need for a tide control gate at Wonderwood Drive,
the City contracted Aikenhead & Odom, Inc. to perform an investigation. The study involved
obtaining and analyzing survey data, modeling, and a report of the findings.
Aikenhead & Odom's recommendation is not to install a tide gate at Wonderwood Drive, but to
fill Regulus Drive to an elevation between 4.0 and 4.5 and construct swales on both sides of
Regulus. This would also require raising and re-coating the sanitary sewer manholes on this
street.
We have obtained a cost estimate from Aikenhead & Odom, indicating the cost of filling and
paving Regulus Drive would be approximately $41,339.
BUDGET: This staff report is for information purposes only. No funds have been budgeted or
appropriated for this project.
RECOMMENDATION: This staff report is for information purposes only. If the road is to be
raised, it is recommended that the work be performed as part of the Wonderwood Connector
Project.
'~ ATTACHMENTS: 1. Report on Wonderwood Tide Control Gate from Aikenhead &
Odom, Inc., dated January 26, 2000.
2. Cost estimate from Aikenhead & Odom, Inc., dated February 4,
2000.
REVIEWED BY CITY MANAGER:
AIKENt1EAD
c~ ODOM ~~~
CONSULTING ENGINEERS
niin~H,.<<„r. ~.
5730 Bowden Road, Suite 200
Jacksonville, Florida 32216
Phone 904/636-5432
FAX 904/636-5433
January 26, 2000
Mr. Robert Kosoy, P.E.
Director of Public Works
City of Atlantic Beach
X200 Sandpiper Lane
Atlantic Beach, Fl. 32233
Re: Wonderwood Tide Control Gate
A&O Project No. 00-002
Page 1 of 2
Dear Bob:
In accordance with purchase Order Number 21581 for the tide gate investigation at
Wonderwood Drive, Aikenhead and Odom has completed the requested study. The study
involves obtainin_e and analyzing existing survey data, developing an existing condition
model and a proposed condition model, reviewing the outputs from the models, and
malting recommendations. Based on this work it is Aikenhead & Odom's
recommendation that a tide control not be installed at Wonderwood Drive at this time.
The water surface elevation on both sides of the existing Wonderwood Drive culverts is
essentially the same. This indicates that the existing culvert is currently allowing
sufficient tidal inflow to fill the upstream channel. This is the same for all the upstream
culverts until Pioneer Drive. At Pioneer Drive the upstream elevation is approximately
0.8 feet lower than the downstream elevation. This is caused by the culvert restriction
and the large area available for storage upstream of Pioneer Drive. Attached are plots
from the computer modeling which show this situation.
x' When the drainage system between Pioneer Drive and Mayport is upgraded, it will be
- necessary to analyze the need for a tidal control structure upstream of Pioneer Drive to
determine how to protect the upstream storage from being filled with tidal water, which
would reduce flood plain storage during a storm event. It may prove most efficient to
install tide control at this locatioin, if/when this facility is altered.
It has been assumed that the proposed tide gate would need to allow approximately the
same tidal flow that the existing 30"pipes currently allow. The tidal flooding on Regulus
Drive would continue based on this assumption. The solution to this problem could be
either installing a flap valve on the drainage system from Regulus Drive or filling above
the mean annual high tide. Both of these solutions would need to be investigated further
to determine the impacts to adjacent offsite properties.
Mr. Robert Kosoy, P.E.
Wonderwood Tide Control Gate
January 26, 2000
Page 2 of 2
It is important to note that a flap gate on the Regulus drain would create head losses,
which could cause or exacerbate upstream flooding problems during a storm event.
Filling of the roadway could block sheet flow from the adjacent property. Both of the
-obstacles could be overcome by either increasing the pipe size to reduce head loss if a
flap valve is used or constructing a drainage swale to pick up the adjacent property if the
fill option is used: '
We recommend filling Regulus Drive to an elevation between 4.0 and 4.5 with the
construction of swales on both sides of Regulus Drive. The proposed roadway should be
constructed as a rural section. The swales should begin 300 feet south of Wonderwood
Drive and drain to the proposed TTA inlet. This inlet should be shifted northerly. The top
elevation should be raised to 4.0 with the throat elevation set at 3.0. The proposed
modifications would eliminate the curb and gutter and add 700 cubic yards of fill. The
lowest elevation on the treatment plant is approximately 4.0 and will drain to the swale.
If we maybe of further assistance in this matter please call me at your convenience.
Sincerely,
Dale Smith, P.E. ~~
Project Manager
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ONSULTING ENGINEERS
5730 Bowden Road, Suite 200 Jacksomnlte, Florida 32216
Tet. No.:(904} 636-5432 Fax No.:(904) 636-5433
REGULUS DRfVE PA1JiNG ESTIMATE'
ITEM N0. DESCRIPTION
1 S1TE PREPARATION
2 1-1/4" ASPHALT
3 6" LIMEROCK
4 12" STABLIZED SUBGRADE
5 A-3 FILL
6 MANHOLE ADJUSTMENT
7 6" CONCRETE DRIVEWAYS
8 FINAL GRADING
9 GRAS5fNG
TOTAL
2141Q0
QUANITY UNITS UNIT COST
COST
1 LS $ 4,500.40 $ 4;500.00
1400 SQYD5 $ 3.00 $ 4,200.00
1550 SQYD5 $ 9.00 $ 13,°50.00
1666 SQYDS $ 1.50 $ 2,495.00
700 CUYDS $ 7.00 $ 4,900.00
3 EACH $ 2,OOO.GO $ 6,000'00
90 SQYDS $ 1x..00 $ 1,260.OG
~ LS $ 2,500.00 $ 2,500.00
1800 SQYDS $ 0.85 $ 1,530.00
$ 41,339.00
'DOES NOT INCLUDE COST OF DRAINAGE COSTS AS50C1ATED WfTH WONDERWOOD