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

N151
Manatee County NAVD88 Vertical Control Densification
Project Type Cooperative Funding
AOR(s)
Water Supply, Flood Protection, Water Quality, Natural Systems
Basin(s) Manasota
Cooperator(s)
Manatee County
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 Manatee County this includes running level loops and
establishing bench marks based on NAVD88 along state and county roadways. This project will enable the surveying
community to make an orderly transition to NAVD88 and will allow Manatee County 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 Manatee County and will compliment the District's NAVD88 migration project.
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. Manatee County 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. Manatee County is a participant in FEMA's Community Rating System and has
a Class 6 rating. A major emphasis of this project is to help Manatee County move from a Class 6 to a Class 5
Community System Rating with FEMA. Manatee County is also coordinating this project with the City of Bradenton and
the City of Palmetto.
Costs
Total cost for contractual services in FY2010 is $150,000 of which the District's share is $75,000. The County will
contribute $75,000. 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 County. 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 76,949 75,000 151,949
Project Funds Not Budgeted by the
District
Manatee County 0 0 0 75,000 75,000 150,000
021 - Manasota Basin 354
Total:
Future
Funding
Total
Funding
$301,949