Examples of Conservation Subdivision
V. Conventional Subdivision
[Added 10-6-2005, as revised
11-10-2005]
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Conservation Subdivision —
Example A
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Conservation Subdivision —
Example B
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Conventional Subdivision
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Hypothetical Scenario:
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Hypothetical Scenario:
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Hypothetical Scenario:
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Lot Area = 100 acres
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Lot Area = 100 acres
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Lot Area = 100 acres
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Regulated Lands = 20 acres
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Regulated Lands = 60 acres
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Regulated Lands = 20 acres
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Step One: Buildable Land Area
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Step One: Buildable Land Area
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Step One: Buildable Land Area
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Lot Area minus Regulated Lands:
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Lot Area minus Regulated Lands:
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Lot Area minus Regulated Lands:
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100 acres — 20 acres = 80 acres
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100 acres — 60 acres = 40 acres
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100 acres — 20 acres = 80 acres
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Step Two: Density Calculation
Area
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Step Two: Density Calculation
Area
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Step Two: Density Calculation
Area
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Buildable Land minus 15%1:
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Buildable Land minus 15%1:
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Not applicable
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80 acres - 12 acres = 68 acres
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40 acres - 6 acres = 34 acres
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Step Three: Total Permitted Number
of Lots
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Step Three: Total Permitted Number
of Lots
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Step Three: Total Permitted Number
of Lots
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Density Calculation Area divided by
Zone Density
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Density Calculation Area divided by
Zone Density
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Density Calculation Area divided by
Zone Density
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68 acres ÷ 80,000 square feet
= 37 lots
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34 acres ÷ 80,000 square feet
= 19 lots
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80 acres ÷ 80,000 square feet
= 44 lots
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Step Four: Dedicated Open Space
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Step Four: Dedicated Open Space
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Step Four: Dedicated Open Space
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Regulated Lands that represent less
than 50% of total require 35% reserved for Dedicated Open Space:
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Regulated Lands that represent more
than 50% of total require 15% reserved for Dedicated Open Space:
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Not required
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80 acres x 35% = 28 acres of Dedicated
Open Space
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40 acres x 15% = 6 acres of Dedicated
Open Space
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Step Five: Land for Lot Layout
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Step Five: Land for Lot Layout
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Step Five: Land for Lot Layout
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Buildable Land Area minus Dedicated
Open Space:
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Buildable Land Area minus Dedicated
Open Space
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Not applicable
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80 acres - 28 acres = 52 acres available
for lot layout
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40 acres — 6 acres = 34 acres
available for lot layout
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80 acres available for lot layout
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Average lot size:
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Average lot size:
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Average lot size:
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52 ÷ 37 = 1.4 acres (60,984
sf) avg. lot size
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34 acres ÷ 19 lots = 1.8 acres
(78,408 sf) avg. lot size
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80 ÷ 44 = 1.8 acres (78,408
sf) avg. lot size
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Subdivision Yields:
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Subdivision Yields:
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Subdivision Yields:
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28 acres of open space
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6 acres of open space
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20 acres of open space
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52 acres developed
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34 acres developed
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80 acres developed
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37 houses
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19 houses
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44 houses
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Shorter road — less cost for
construction and maintenance
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Shorter road — less cost for
construction and maintenance
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Longer road — more cost for construction
and maintenance
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Less disturbance, more vegetation preserved
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Less disturbance, more vegetation preserved
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More disturbance, less vegetation preserved
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NOTE:
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1
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Allowance for internal roads and circulation.
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