[Adopted 7-15-1975 by Ord. No. 978]
The following performance guidelines are hereby
established and shall apply to all property within the Crystal Lake
Watershed:
A. The natural groundwater flow hydraulics of the Crystal
Lake Watershed shall be preserved. Thus present groundwater levels
must be maintained.
B. Urban developments shall be designed to preserve present
natural drainage patterns and local groundwater recharge conditions.
All drainage systems shall be designed to recharge to the groundwater
locally. No surface drainage systems shall flow directly to Crystal
Lake.
C. Stormwater management systems for developed areas
shall be designed to protect the quality of surface and groundwater
discharges.
D. Development intensities and associated local area
drainage design shall be restricted to those plans with natural surface
drainage management systems capable of complete local recharge of
the one-hundred-year design storm.
E. Natural areas of runoff detention and groundwater
recharge shall be protected from urban development through dedication
or acquisition.
F. Water supply systems using only the bedrock aquifers
shall be required for all urbanized areas of the Watershed where sewage
collection systems are to be provided.
G. Leaktight designs shall be used in sanitary sewer
construction to minimize stormwater and groundwater infiltration.
H. Septic tank disposal systems shall be prohibited in
the outwash soil area, with the exception of existing farming activities.
The purpose of the Watershed Districts is to
establish areas of controlled land use practices and management policies
which will regulate development within the Crystal Lake Watershed
through designation of zoning districts in which land will be classified
in order to protect the water quality and the natural recharge conditions
of the Watershed. By protecting the water quality and the natural
recharge conditions of the Watershed, recreational and aesthetic values
of the land will be maintained, the water supply will be protected,
groundwater levels will be maintained, the natural beauty and processes
of the Lake will be preserved, and in general, the public health and
welfare of the community will be protected. Development within the
districts will be carefully examined and controlled to ensure that
these conditions are maintained. Planned unit developments are encouraged.
No development will be permitted in the districts that would have
an adverse effect upon these conditions.
The following objectives may be achieved by
defining the Crystal Lake Watershed and controlling development within
this area:
A. Preserve and improve the quality of the Lake water
and natural beauty of the Lake and its surroundings.
B. Conserve natural conditions, wildlife, and open spaces
for the education, recreation and general welfare of the public.
C. Protect the Crystal Lake aquifer recharge conditions,
both the quantity and the controlled discharge rate, and preserve
the naturally regulated flow dynamics of the aquifer supplying Crystal
Lake.
D. Improve the quality of the surface and subsurface
discharges to the Lake by limiting nutrients and other contaminants.
E. Reduce the amounts of accumulated in-place nutrients
contained in Crystal Lake's sediments.
F. Regulate urban and rural watershed land use practices
so that they will be consistent with optimum water resource protection.
[Added 12-17-2019 by Ord.
No. 7599, effective 1-1-2020]
Development shall follow the requirements outlined within Chapter
595, Stormwater Management, the Crystal Lake Watershed Stormwater Management Design Manual dated November 6, 2007, and the Crystal Lake Watershed Stormwater Management Program Implementation Plan adopted November 6, 2007, and amended June 18, 2013, except that redevelopment or additional impervious surface area within existing urbanized residential shall follow the requirements outlined in the City's Crystal Lake Watershed Existing Urbanized Residential Requirements dated January 1, 2020.