B. Surface Water Related City Code Updates
CITY OF
CHANHASSEN
7700 Market Boulevard
PO Box 147
Chanhassen, MN 55317
Administration
Phone: 952.227.1100
Fax: 952.227.1110
Building Inspections
Phone: 952.227.1180
Fax: 952.227.1190
Engineering
Phone: 952.227.1160
Fax: 952.227.1170
Finance
Phone: 952.227.1140
Fax: 952.227.1110
Park & Recreation
Phone: 952.227.1120
Fax: 952.227.1110
Recreation Center
2310 Coulter Boulevard
Phone: 952.227.1400
Fax: 952.227.1404
Planning &
Natural Resources
Phone: 952.227.1130
Fax: 952.227.1110
Public Works
1591 Park Road
Phone: 952.227.1300
Fax: 952.227.1310
Senior Center
Phone: 952.227.1125
Fax: 952.227.1110
Web Site
www.ci.chanhassen.mn.us
B
MEMORANDUM
To: Todd Gerhardt, City Manager
From: Lori Haak, Water Resources Coordinator
Date: February 26, 2007
o~
Re: Surface Water-Related City Code Updates
BACKGROUND
At its work session on January 22,2007, the City Council continued
reviewing proposed revisions to City Code. The proposed definition of
"impervious surface" and proposed wetland buffer and setback requirements
were discussed. Due to time constraints, the City Council requested the
opportunity to discuss the recommended changes at another work session.
DISCUSSION
1. Impervious Surface.
Why Does the City Regulate Imperviousness?
. The Minnesota Department of Natural Resources requires imperviousness
be regulated within shoreland zones (areas within 1,000 feet of the
ordinary high water mark of lakes or within 300 feet of the ordinary high
water mark of rivers or streams).
. Research has indicated that there is a distinct correlation between the
water quality in a body of water and the amount of imperviousness within
that subwatershed. Subwatersheds that have more than 25%
imperviousness experience dramatic decreases in water quality. It has
been shown that even 10% imperviousness within a subwatershed will
significantly impact the receiving waters.
o The Bluff Creek Corridor Feasibility Study, currently in draft form
from the Riley-Purgatory-Bluff Creek Watershed District,
recommends a maximum 20% imperviousness within the Bluff Creek
watershed. Currently, the watershed is at approximately 13%
imperviousness overall; however, the developed portions of the
watershed (north of Lyman Boulevard) are at approximately 19%.
. Impervious surfaces concentrate runoff and can contribute to off-site
impacts (e.g., localized flooding, erosion).
. The nondegradation provisions of the Minnesota Pollution Control
Agency's Municipal Separate Storm Sewer Permit require Chanhassen to
The City of Chanhassen . A growing community with clean lakes, quality schools, a charming downtown, thriving businesses, winding trails, and beautiful parks. A great place to live, work, and play.
Todd Gerhardt
February 26, 2007
Page 2 of 3
keep the water quality of its lakes and creeks the same or better, when compared
to 1988 water quality. Since Chanhassen has experienced significant growth
since 1988, it is anticipated that the City will need to regain some ground with
respect to water quality. Since increases in imperviousness lead to declines in
water quality, any limitations on imperviousness will help reduce the amount of
work that the City will have to do to attain 1988 water quality.
What is Being Done by Other Cities?
Generally speaking, there is not a consistent approach in interpreting imperviousness.
The definitions of imperviousness in other cities and a table summarizing the
interpretations of those definitions are included (Attachments 1 and 2).
Staff Recommendation
Staff recommendation is to amend the definition of "impervious surface" found in the
City Code to incorporate items as they are currently interpreted by City staff. The
definition recommended by staff is:
Impervious surface means any material that reduces or eliminates water infiltration
when compared to local native soil surface and structure. Impervious surfaces
include, but are not limited to: bituminous and concrete driveways, pavers of all
material, compacted aggregate, non-porous landscape underlayment, retaining walls,
buildings, rooftops, patios, landscape stepping stones or flagstones, driveways, pool
decking and any other structures. Exemptions include decks when installed without
impervious surface below, landscape rock or mulch with pervious underlayment.
A list of pros and cons of the staff recommendation is attached (Attachment 3) for the
Council's consideration.
2. Wetland Buffer and Setback Requirements.
Setbacks from wetland edges have been required by the City since the 1980s. In
1994, the City began to require wetland buffers as part of the setback. The overall
setback was decreased at that time because the buffer added benefits that did not exist
when only a setback was required. A list of the benefits of wetland buffers and
setbacks is attached (Attachment 4).
In reviewing a comparison of wetland buffer and setback requirements, it became
evident that Chanhassen's setback distance exceeded setbacks required by other cities
(Attachment 5). In light of that comparison, staff has modified the recommendation,
as outlined in the explanation below and depicted in Attachments 6 and 7.
Revised Staff Recommendation
Staff recommends that the buffer widths remain consistent with those previously
proposed (Attachment 6). With the modified staff recommendation, principal
structures would be required to meet the 40-50' setback. Accessory structures would
be required to be set back 50% of the principal structure setback.
Todd Gerhardt
February 26, 2007
Page 3 of 3
Example 1: A residential lot on a Manage 2 wetland would be required to preserve a
25-foot buffer. The house must be set back at least 40 feet from the buffer edge (65
feet from the wetland edge). A swimming pool (including the pool deck) must be set
back at least 20 feet from the buffer edge (45 feet from the wetland edge).
Staff proposes that existing lots would be able to decrease the accessory structure
setbacks if the appropriate buffer width is dedicated (through a document recorded
with the property). At that time, the new setback for accessory structures would be
50% of the remaining setback.
Example 2: A home in an existing subdivision on a Manage 3 wetland has a 10 foot
buffer and a 40 foot setback. The homeowner establishes an additional 10 feet of
buffer (total 20 feet) and has a document recorded against the property. The new
setback for accessory structures would be 15 feet from the wetland buffer edge (50%
of the remaining 30 feet).
Examples showing actual lots, buffers and setbacks and the implications of the
revised staff recommendation will be supplied at the work session.
Ordinance language has not yet been drafted. Staff is awaiting Council direction on
this modified recommendation.
RECOMMENDED ACTION
The Council should review and discuss the proposed code revisions and recommend
any changes to staff. The City Code updates should be scheduled for a City Council
meeting agenda in the near future so they can be adopted and implemented as soon as
practical.
ATTACHMENTS
1. Definitions of Impervious Surface from Chanhassen and Other Communities.
2. Comparison of Imperviousness by Community.
3. Pros and Cons of Staff Recommendation.
4. Benefits of Wetland Buffers and Setbacks.
5. Comparison of Wetland Buffer and Setback Requirements.
6. Existing and Proposed Wetland Classifications, Buffer Strips and Setbacks.
7. Proposed Wetland Buffer Strips and Setbacks.
G:\ENG\Lori\Surface Water\2006 SWMP Update\Code Updates\CC 022607\022607 CC Work Session Memo.doc
Impervious Surface Definitions
Chanhassen:
Existing definition:
Impervious surface means any material that substantially reduces or prevents the
infiltration of storm water. It shall include, but not be limited to, gravel driveways,
parking area, buildings and structures.
Proposed definition:
Impervious surface means any material that reduces or eliminates water infiltration when
compared to local native soil surface and structure. Impervious surfaces include, but are
not limited to: bituminous and concrete driveways, pavers of all material, compacted
aggregate, non-porous landscape underlayment, retaining walls, buildings, rooftops,
patios, landscape stepping stones or flagstones, driveways, pool decking and any other
structures. Exemptions include decks when installed without impervious surface below,
landscape rock or mulch with pervious underlayment.
Bloomington:
Impervious Surface: Any surface which prevents absorption of storm water into the soil.
Eagan:
Impervious Surface: A material providing a hard surface which prevents normal
absorption of water into land. It shall include, but not be limited to gravel driveways,
parking areas, buildings and structures.
Maple Grove:
Impervious surface means an artificial or natural surface through which water, air, or
roots cannot penetrate, except that a swimming pool shall not be considered an
impervious surface to the extent of the surface area of any water that may be used to fill
the pool.
Minnetonka:
Impervious surface: A material providing a hard surface which prevents normal
absorption of water into land.
Ramsey:
Impervious surface: A properly maintained artificial surface through which water cannot
easily penetrate.
Shoreview:
Impervious Surface Coverage: Any surface that prevents substantial infiltration of
precipitation and prohibits the growth of vegetation. Such surfaces include, but are not
limited to, driveways, parking lots, patios, roofs, sidewalks, streets, swimming pools and
tennis courts. Impervious materials include asphalt; brick; concrete; crushed rock or
stone; gravel; plastic; and stone. The City Manager or his/her designee shall determine
whether any proposed surface or material is pervious or impervious. The use of the
material shall be considered when making a determination of the pervious or impervious
nature of any material, i.e., areas subject to repeated pedestrian and vehicular traffic
become compacted and are considered impervious.
G:\ENG\Lori\Surface Water\2006 SWMP Update\Code Updates\Misc\Other Communities Impervious.doc
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Benefits of Wetland Buffers and Setbacks
Buffers
. Provide wildlife habitat.
. Improve water quality (nutrients, chemicals, sediment, trash).
. Mitigate water quantity.
. Improve vegetative diversity.
. Improve quality of habitat through "edge effect."
. Protect wetlands from "unintentional" impacts (grass clippings, gradual
encroachment, etc.).
. Provide shade (mitigation of thermal impacts).
. Increase ability to manage floodwaters (storage, transpiration, evaporation).
. Provide additional stormwater capacity.
. Aesthetic benefits.
. Keeps fertilizer application away from edge of wetland.
Setbacks
. Originally (prior to 1992), the city required only a setback of 75-100'. The city
recognized the increase in benefits by requiring a buffer, so the setback (and
therefore the total setback distance) was decreased.
. Provide additional protection for wetland buffer and wetland.
. Provide "useable" yard/area.
. Provide additional water quality/water quantity benefits.
. Retaining walls and fences are permitted.
. Encourages sheet flow of water across setback/buffer.
G:\ENG\Lori\Surface Water\2006 SWMP Update\Code Updates\CC 022607\Benefits of Wetland Buffers and Setbacks. doc
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