Critical Area Mapping Update Project St. Mary s County Town Hall April 8th, :30 p.m.

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1 Critical Area Mapping Update Project St. Mary s County Town Hall April 8th, :30 p.m. Critical Area Commission for the Chesapeake and Atlantic Coastal Bays St. Mary s County

2 What Is the Critical Area Program? Based on Chesapeake Bay Critical Area Act passed in 1984 Land use and resource protection program implemented at the local level Involves additional regulatory requirements for development activity and changes in land use within the Critical Area

3 Where Is the Critical Area? All waters of the Chesapeake Bay, the Atlantic Coastal Bays, and their tributaries to the head of tide All land under these waters All land within 1,000 feet of the landward edge of tidal waters and tidal wetlands Approximately 11% of the State and 680,000 acres

4 Why Update Now? Base maps were 1972 Tidal Wetlands Maps that were not ortho-rectified or georeferenced Boundary was drawn manually inherent inaccuracies Extensive changes to the landscape, shoreline, and wetlands; maps must match the landscape Electronic maps are now the industry standard Critical Area boundary needs to be web-accessible Original 1,000-foot boundary not always consistent, and uniform Current maps difficult to update

5 House Bill 1253 Mapping Provisions Requires change from Critical Area delineated on 1972 Tidal Wetlands Maps to Critical Area delineated on Statewide Base Map State and local governments to work cooperatively to develop maps

6 What Does this Mean for My Property? The Critical Area boundary line is being changed on your property and that at least a portion of your property will be subject to the Statemandated Chesapeake and Atlantic Coastal Bays Critical Area Law

7 Critical Area Designations Three Critical Area Designations: Intensely Developed Area Generally will require some form of stormwater management Limited Development Area Generally will require lot coverage (impervious surface limits) and clearing limits. Resource Conservation Area In addition to those requirements for LDA, there is a minimum 1 dwelling unit per 20 acre density

8 Lots Now Proposed for Inclusion in the Critical Area Existing structures and uses are considered grandfathered. Future development activities that will require a building permit will be subject to the County s Critical Area requirements.

9 Critical Area Mapping Update Project Pilot Project Compile data sources Digitize shoreline, tidal wetlands, and the Critical Area Create web application Manage project

10 Digitize Shoreline Factors to Consider: Edge of open water Location of water at time of image capture Consideration given to tree canopy / shadows Width of channel

11 Digitize Wetlands Factors to Consider: Vegetation patterns Consideration given to tree canopy / shadows Multiple data sources needed to confirm

12 Digitize Wetlands

13 Digitize Wetlands

14 Review Process Discrepancies, anomalies, inconsistencies identified by ESRGC, CAC, and local jurisdictions as review points WebEx/conference calls, review points are jointly analyzed Additional resources (permits, historical aerials, etc.) help resolve issues Ground truthing Multiple rounds Shoreline/wetlands Designations

15 Proposed Critical Area

16 Current Critical Area

17 Proposed Critical Area

18 Public Notification Generate list of properties with increase 1% or more Mail letters to property owners including: Property map Contact info Link to Web Map Public info meeting included

19 Interactive Mapping Tool - allows the public to easily determine if their property is in the Critical Area Public Notification

20 Analysis St. Mary s County Change Gains 4,884 acres Losses 1,176 acres Same 44,247 acres Net (+) 3,708 acres

21 Analysis

22 Analysis

23 Analysis

24 Questions? Critical Area Commission for the Chesapeake and Atlantic Coastal Bays 1804 West Street, Suite 100 Annapolis, MD (410)