Ordinance 721Page 1
CITY OF CHANHASSEN
CARVER AND HENNEPIN COUNTIES, MINNESOTA
ORDINANCE NO. 721
AN ORDINANCE AMENDING CHAPTER 20, ZONING,
OF THE CHANHASSEN CITY CODE AMENDING LOT COVER STANDARDS IN
THE SHORELAND OVERLAY DISTRICT
THE CITY COUNCIL OF THE CITY OF CHANHASSEN, MINNESOTA,
ORDAINS:
SECTION 1. Section 20-485 Stormwater Management of the City Code, City of
Chanhassen, Minnesota, is hereby amended to read as follows:
Section 20-485 Stormwater Management
Lot coverage of lots shall not exceed 25 percent of the lot area, except as follows:
(a) 30 percent impervious shall be allowed for lots zoned Residential Single Family
(RSF) which were platted prior to January 1, 1976, with the following conditions:
(1) Riparian Lots
a. When exceeding 25 percent impervious coverage, riparian lots shall
be required to have a shoreline vegetative buffer area equal in size to
the new impervious area proposed over 25 percent of the lot area.
(Example: 100 square feet of impervious area will require 100 square
feet of shoreline vegetative buffer area).
1. The shoreline vegetative buffer will be required to encompass
at least 25 percent or 20 feet of the linear water frontage,
whichever is greater. The buffer width shall be the width
necessary to achieve the required buffer area. (For example,
100 square feet of impervious area required with 25 feet of
buffer length along the shoreline would require a vegetative
buffer width of 4 feet.)
2. If the vegetative buffer required is determined to be infeasible
by the City Engineer, alternative Best Management Practices
(BMPs) shall be installed as outlined in section B.
3. Access to the lake for swimming or dock use shall be
maintained.
4. The vegetative buffer may satisfy the BMP requirement
outlined below.
b. The following shall be provided at the time of permit application:
1. Pre- and post-project lot cover calculations.
2. Water Quality Volume shall be calculated by 1.1 inch
multiplied by the area in square feet of impervious area over
25 percent.
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3. BMPs shall be designed to treat the calculated amount of
Water Quality Volume created by the proposed impervious
area.
4. Project plans on a scaled survey shall show the proposed
impervious surface as well as the offsetting location and
design of BMPs. This could include native vegetative buffers,
rain gardens, rain barrels, infiltration/biofiltration
basins/swales, etc.)
5. An erosion and sediment control plan in accordance with
Section 19-145 of the City Code.
6. Additional information, such as Hydrologic and Hydraulic
Modeling, plans certified by a professional engineer, etc., may
be required as determined by the City Engineer when there is
reasonable cause for concern of the impacts of the increased
stormwater runoff.
c. Changes in stormwater runoff shall not cause adverse impacts to
adjacent and downstream infrastructure.
d. BMPs installed shall be privately owned and may require an
Operations and Maintenance Agreement to be recorded against the
property at the discretion of the City Engineer.
e. Vegetative buffer areas shall be protected in an easement recorded
against the property, and monuments shall be installed at the easement
boundary
(2) Non-Riparian Lots
a. The following shall be provided at the time of permit application.
1. Pre- and post-project lot cover calculations.
2. Water Quality Volume shall be calculated by 1.1 inch
multiplied by the area in square feet of impervious area over
25 percent.
3. BMPs shall be designed to treat the calculated amount of
Water Quality Volume created by the proposed impervious
area.
4. Project plans on a scaled survey shall show the proposed
impervious surface as well as the offsetting location and
design of BMPs. This could include native vegetative buffers,
rain gardens, rain barrels, infiltration/biofiltration
basins/swales. etc.
5. An erosion and sediment control plan in accordance with
Section 19-145 of City Code.
6. Additional information such as Hydrologic and Hydraulic
Modeling, plans certified by a professional engineer, etc. may
be required as determined by the City Engineer when there is
reasonable cause for concern of the impacts by the increased
stormwater runoff.
b. Changes in stormwater runoff shall not cause adverse impacts to
adjacent and downstream infrastructure.
c. BMPs installed shall be privately owned and may require an
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Operations and Maintenance Agreement to be recorded against the
property.
(b) 35 percent for medium/high-density residential zones; and
(c) 70 percent in industrial zones within the Lake Susan Shoreland District.
SECTION 2. This ordinance shall be effective immediately after its passage and publication.
PASSED AND ADOPTED this 22nd day of January 2024 by the City Council of the
City of Chanhassen, Minnesota.
ATTEST:
Kim Meuwissen City Clerk Elise Ryan, Mayor
(Published in the Chanhassen Villager on February 1, 2024)
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CITY OF CHANHASSEN
CARVER AND HENNEPIN COUNTIES, MINNESOTA
SUMMARY OF ORDINANCE NO. 721
AN ORDINANCE AMENDING CHAPTER 20, ZONING,
OF THE CHANHASSEN CITY CODE AMENDING LOT COVER STANDARDS IN
THE SHORELAND OVERLAY DISTRICT
The purpose of this Code amendment is as follows:
Section 20-485 Stormwater Management of the City Code is being amended to update lot
cover standards in the Shoreland Overlay District.
A printed copy of Ordinance No. 721 is available for inspection by any person during
regular office hours at the office of the City Clerk.
PASSED, ADOPTED, AND APPROVED FOR PUBLICATION this 22nd day of
January 2024 by the City Council of the City of Chanhassen.
(Published in the Chanhassen Villager on February 1, 2024)