Developing a conservation design subdivision allows greater
design flexibility and is intended to:
A. Maintain and protect the rural character of the Village;
B. Allow for the continuation of limited agricultural uses in those
areas best suited for such activities and when the continuation of
such activities would be compatible with adjoining nonfarm uses; and
C. Preserve, protect and minimize disturbance of the natural resources
and environmentally sensitive areas in the Village.
A conservation design subdivision is reviewed as a planned development
district as set forth in Article 6, except as may be specifically
modified in this article.
Conservation design developments are only allowed in the Single-Family
Cluster (RS-1B) District and Two-Family Cluster (RD-2) District.
At the time of establishment, the conservation design project
must include 18 acres or more of contiguous lands.
At the time of establishment, all land within a conservation
design project shall be under single ownership or control.
The number of lots in a conservation design development is determined
based on the steps described below.
A. Step one. Calculate the net developable area as follows:
(1)
Total site area as determined by site survey: _____ acres.
(2)
Subtract total reductions from Table A below: (minus) _____
acres.
(3)
Equals net developable area: _____ acres.
Table A
Area Reductions for Environmental Constraints and Other Features
|
---|
100% of the area that is needed for public right-of-way for
any existing roads (i.e., from lot line to the base setback established
by the Washington County Highway Width Map)
|
_____ acres
|
100% of the area that is within the floodplain overlay district
and that is or can be defined as floodway
|
_____ acres
|
50% of the area that is within the floodplain overlay district
and that is or can be defined as floodfringe
|
_____ acres
|
50% of the area that constitutes a wetland
|
_____ acres
|
50% of the area where the slopes are more than 20%
|
_____ acres
|
50% of the area within the Environmental Corridor Overlay District,
if any
|
_____ acres
|
10% of the area where the slopes are from 12% to 20%
|
_____ acres
|
Total
|
_____ acres
|
Note: Acres are rounded to tenths of an acre.
|
B. Step two. Calculate the maximum number of residential lots by dividing
the net developable area by the minimum lot size for the zoning district
(either RD-2 or RS-1B). (The dividend is rounded down to the next
whole number.)
C. Step three. The land division is laid out so that each lot 1) complies
with all applicable dimensional standards (e.g., minimum lot area,
lot width) as set forth in the zoning district regulations and land
division regulations, 2) do not contain more than the maximum levels
of features in Table B, and 3) has a building envelope of sufficient
size and configuration to accommodate principal and accessory uses
that are allowed in the zoning district. Overall, lots must be laid
out so as to minimize potential development in the Environmental Corridor
(EC) Overlay District.
Table B
Maximum Area of Lot with Environmental Constraints
|
---|
Feature
|
Percent of Lot
|
---|
Wetlands (These are to be located in outlots.)
|
0%
|
Floodway
|
10%
|
Land where the slopes are more than 20% plus floodfringe
|
40%
|
Lots in a conservation subdivision project shall comply with
the minimum lot sizes and comply with the overall density requirements
set forth in Appendix C:
The design and layout of residential lots and open space outlots
shall satisfy the following:
A. Residential lots and open space outlots shall be designed and arranged
to minimize the destruction or alteration of natural resource features.
In order of priority, open space outlots should include the following
natural resource, open space, and agricultural features, in whole
or in combination, in order to maximize preservation of the Village's
rural character:
(1)
Lakes, ponds, rivers, streams, wetlands, shorelands and floodplains;
(3)
Steep slopes (greater than 12%);
(4)
Other areas located designated as environmental corridors on
the future land use map in the Village's Comprehensive Plan;
(5)
Other areas comprised of wet, poorly drained and organic soils;
(7)
Other drainage and stormwater facilities.
B. Open space areas shall be designed and arranged as contiguous areas
having a minimum area not less than 10% of the total gross area of
the parcels being developed.
C. Open space areas shall be designed and arranged to:
(1)
Provide a perimeter buffer not less than 50 feet in width between
residential lots within the subdivision and adjoining property;
(2)
Provide for the continuation of and cross access between existing
and future open space areas on adjoining properties;
(3)
Provide at least one pedestrian-type accessway or easement from
each public subdivision street to each open space area within the
development that is not less than 30 feet in width;
(4)
Provide a minimum open space buffer not less than 200 feet in
width between the nearest property lines for any residential lot and
all state highways, county highways, and Village section line roads;
and
(5)
Provide a minimum open space buffer not less than the following
between the nearest property lines for any residential lot and the
perimeter boundary of all wetlands currently inventoried and designated
by the state Department of Natural Resources (DNR), Army Corps of
Engineers (ACOE), and/or state Natural Resources Service (NRCS):
(a)
Isolated wetlands: 50 feet; and
(b)
Connected wetlands: 75 feet.
D. Residential lots should be arranged within the parcels being developed
in order to:
(1)
Minimize potential conflicts with adjoining agricultural uses
and operations;
(2)
Minimize the number of abutting residential lots so no more
than two lots abut any other lot; and
(3)
Maximize the number of lots that abut and have access to the
open space areas provided within the development.
E. Individual lots, parcels and outlots should be designed and arranged
to minimize the amount of land required for additional public roads
while providing for the future extension of public streets to adjoining
vacant land.