wetlands in maine
TRANSCRIPT
Interpreting Wetland Areas
Discuss how wetlands can affect
utility and value
Applying Assessing Principles
Understanding Wetlands
Locating and Identifying Wetlands
Discuss how to put it into practice
Wetland Functions
• Prevent Flooding
• Recharge Ground Water Aquifers
• Prevent Shorelines from Erosion
• Preserve Water Quality
• Preserve Critical Habitats
Wetland Definition
• INUNDATED OR SATURATED SO THAT IT SUPPORTS WETLAD VEGETATION ADAPTED FOR WET SOILS
Wetland Identification
1. Hydrology
2. Hydric Soils
3. Hydrophitic Vegetatioin
Wetland Types
• Freshwater Wetlands
• Coastal Wetlands
Coastal Wetland
Inland Marshes
Wet Meadows
Peatlands
Shrub Swamps
Forested Wetlands
Forested Wetlands
Forested Floodplain
Vernal Pools
Vernal Pool in Summer
Significant Vernal Pools
Vernal Pools
Appraisal Process
DISCOVER
VALUE
LIST
DISCOVERY
• Aerial Photos• On Site Inspection• National Wetlands Inventory (NWI)• Google Earth • Tree Growth Reports• Code/Planning Files• Real Estate Listings
National Wetlands Inventory
• OGIS
• NWI
• LOCALIZED COVERAGE
• USE ARCMAP
• USE CAMA
GOOGLE EARTH
• DOWNLOAD GOOGLE EARTH
• PARCEL LINES
• ACCESS THROUGH OGIS
– http://www.maine.gov/megis/catalog/
• SAVE
LIST
• Land Lines
• Backup Documents
LAND LINES
LAND LINES
Value Considerations
• Utility
–Physical limitations
–Legal Restrictions
–“Grandfathering”
• Market Preferences
• Fairness
Excess (Rear) Land
• Does excess land include wetlands?
• Are wetlands listed separately?
– Advantage: can study the market
– Disadvantage: have to have a degree of accuracy
• What are the impacts of listing wetland?
– How much value to put on it?
Baselots
• What are implications of wetlands on a baselot?
• How should we calculate the baselot value?
Discount Calculation (Base Lot)
1 - SQRT (PERCENT GOOD) = DISCOUNT
1 - SQRT (75%)
1 - 87% = 13% , say 10%
Take-aways
• Understand and explain wetlands.
• Mind your parcel line coverage.
• Use the National Wetland Inventory, but use your judgment, too.
• Google Earth is helpful.
• Develop a policy on how to handle wetlands.
• OGIS is spiffy!
• Don’t forget the market.
REFERENCES
Maine Wetlands and Boundaries by Ralph W. TinerState of Maine Department of Economic and Community DevelopmentJune 1994
“Wetlands in Maine“Department of Environmental Regulationhttp://www.maine.gov/dep/water/wetlands/types.html
“National Wetlands Inventory”http://www.fws.gov/wetlands/
“Maine Office of Geographic Information” (OGIS)http://www.maine.gov/megis/
“Google Earth”https://www.google.com/earth/
David SawyerAssessor, Town of [email protected]