MANASOTA & PEACE RIVER BBDs Meeting Notebook 10-21-09.docx

N188
City of Bradenton NAVD88 Vertical Control Densification
Project Type Cooperative Funding
AOR(s)
Water Supply, Flood Protection, Water Quality, Natural Systems
Basin(s) Manasota
Cooperator(s)
City of Bradenton
Project Manager OWENS, JIM
Task Manager(s)
Status Ongoing
Description
The establishment of an accurate and easily accessible vertical control survey network is an important component in
the development of updated Federal Emergency Management Agency Flood Insurance Rate Maps (FEMA FIRM). The
District, in cooperation with the National Geodetic Survey and the Florida Department of Environmental Protection, has
completed the Distict-wide vertical control densification. This project will further enhance the existing vertical control
network to support FEMA FIRM mapping, topographic data collection and modeling activities. The newly-established
vertical control network will allow the District and local governments to transition from the older and less accurate
vertical control survey network known as the National Geodetic Vertical Datum of 1929 to the more accurate North
American Vertical Datum of 1988 (NAVD88) system. In the City of Bradenton this includes running level loops and
establishing bench marks based on NAVD88 along city roadways. This project will enable the surveying community to
make an orderly transition to NAVD88 and will allow the City of Bradenton to be on the same vertical datum as the
District and to comply with the federal surveying and mapping requirements. This project will densify the NAVD88
vertical control in the City of Bradenton and will compliment the District's NAVD88 migration project. The City of
Bradenton will coordinate all vertical control surveying with Manatee County (N151).
Benefits
Densification of benchmarks will support the development of Watershed Management Plans for Polk County thus
contributing to flood protection, natural systems, water quality and water supply. The City of Bradenton participates in
the National Flood Insurance Program administered by FEMA and requires that all finished floor elevations be above
the 100 year floodplain. This project is a key component in meeting this requirement. Also, the establishment and
implementation of the NAVD 1988 will enable more accurate elevations and mapping throughout the District, and the
conversion to the modern vertical datum will allow the ability to establish accurate and reliable elevations using Global
Positioning System (GPS) technology.
Costs
Total cost for contractual services in FY2010 is $136,600 of which the District's share is $68,300. The City of
Bradenton will contribute $68,300. The District's share of funding for this project is within the Manasota Basin.
Additional costs are associated with staff time required to manage the project.
Additional Information
This project will be administered by the City of Bradenton. The vertical control network survey work will be completed
by qualified professional surveying and mapping consultants. All newly-established vertical control network data
produced by this project will be made available through Internet access via LABINS web site and the Manatee County
web site.
Prior
Funding
Cumulative FY 2009 FY2010
Transfers Funding Funding
District Budgeted - Ad Valorem Based
Revenue
021 Manasota Basin 0 0 0 70,249
0 70,249
Project Funds Not Budgeted by the
District
City of Bradenton 0 0 0 68,300
0 68,300
021 - Manasota Basin 358
Total:
Future
Funding
Total
Funding
$138,549