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Critical Area Mapping Update Project

Learn about the Critical Area Mapping Update Project in Anne Arundel County, Maryland. This project aims to update the mapping of the Chesapeake Bay and Atlantic Coastal Bays Critical Areas to ensure accuracy and compliance with regulations. Discover how this update may affect your property and find out about the different Critical Area designations. Stay informed through the interactive mapping tool and public notification process.

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Critical Area Mapping Update Project

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  1. Critical Area MappingUpdate ProjectAnne Arundel CountyOctober 2019 Critical Area Commission for the Chesapeake and Atlantic Coastal Bays Anne Arundel 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 State-mandated 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 acres.

  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. Mapping ProcessDigitize 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. Mapping ProcessDigitize Wetlands Factors to Consider: • Vegetation patterns • Consideration given to tree canopy / shadows • Multiple data sources needed to confirm

  12. Mapping ProcessDigitize Wetlands

  13. Mapping ProcessDigitize Wetlands

  14. Mapping ProcessReview 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. Mapping ProcessCritical Area Gain

  16. Mapping ProcessCritical Area Gain

  17. Mapping ProcessCritical Area Loss

  18. Mapping ProcessCritical Area Loss

  19. Mapping ProcessCurrent/Proposed Critical Area

  20. Mapping ProcessProposed Critical Area

  21. Mapping ProcessPublic 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

  22. Mapping ProcessPublic Notification Interactive Mapping Tool - allows the public to easily determine if their property is in the Critical Area

  23. Questions? Critical Area Commission for the Chesapeake and Atlantic Coastal Bays1804 West Street, Suite 100Annapolis, MD 21401(410) 260-3460

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