HomeMy Public PortalAboutResolutions-2012-33CITY OF TIFFIN, IOWA, RESOLUTION NO. 2012 -33
A RESOLUTION APPROVING CHANGES IN TIFFIN DESIGN STANDARD SECTION
9.13 STORM WATER MANAGEMENT FACILITIES
WHEREAS, the City of Tiffin, wishes to amend the Tiffin Design Standards Section
9.13 regarding storm water management facilities by repealing the existing section and
adopting the following in its place;
WHEREAS, Section 9.13 Storm -Water Management Facilities will now read as
follows:
D. Location Criteria:
1. Storm water retention and management facilities will not be deeded to or
maintained by the City unless the City makes a specific agreement with the
developer to undertake ownership or management.
2. Storm water detention is not allowed within any front or side yard setbacks,
required by building code, or within 25 feet from the estimated back building line.
3. Regional storm water management facilities are encouraged and may be
required.
4. Required storm water management facilities that are of sufficient size may be
deeded to and maintained by the City. The conditions for City ownership will be
reviewed on a case by case basis.
E. Design considerations
1. Dry-bottom detention facilities must be oversized by 10% to help offset anticipated
sedimentation prior to total watershed development.
2. Maximum side slopes of dry bottom facilities will not exceed 3:5:1. Maximum side
slopes from the point of normal water level to a point 20 feet land side and 20 feet
water side must be 9: 1. The maximum rip -rap slope be increased to 3 feet.
3. Low flow pipes are required to convey low flows from storm sewer outlets to the
detention facility outlet structure. Low flow pipes must be a minimum of 12 inches
in diameter unless it can be shown that the bottom of the detention facility will
remain dry. Low flow pipes shall must be slotted and bedded in freely draining
aggregate. Alternate methods of subsurface drainage may be proposed.
4. Wet detention ponds must include erosion stone rip -rap.
5. All detention facilities must be graded such that all areas to have grass will be in
mowing condition.
6. Wet detention ponds must have minimum pool depth of 10 feet for at least 25% of
the permanent pool area. Upon completion of the pond, the owner must stock the
pond with appropriate bass, bluegill, and catfish combination. Owner may contact
DNR fisheries for fish stocking.
7. Short (three to four foot height) urban mix native and, or wetland plantings must be
provided for at least 25% of the pond normal water level perimeter. Plantings must
be on average at least ten feet wide. Planting mixes must be approved by the City
Engineer. Preferred locations of plantings are around the outlet devices.
F. Dry hydrant Installation
1. All wet - bottom detention facilities must have an emergency vehicle accessible dry
hydrant installed. See Figure 9.1, and Figure 9.2. Additional information regarding
installation is available at the Office of the City Engineer. All dry hydrant
installation sites will be approved by the Fire Chief and construction drawings will
be approved by the Fire Chief and the City Engineer.
NOW, THERFORE, BE IT RESOLVED, BY THE City Council of Tiffin, Iowa, to approve
the changes to Tiffin Design Standards Section 9.13 Storm Water Management Facilities.
On the 8th day of August, 2012 at a regular City Council meeting Council person Ryan
introduced Resolution 2012 -33 A RESOLUTION APPROVING CHANGES IN TIFFIN
DESIGN STANDARD SECTION 9.13 STORM WATER MANAGEMENT FACILITIES
and made a motion for approval. The motion was seconded by Councilperson Weipert.
Ayes: Ryan, Bartels, Weipert, Ball, Upton
Nays: none
Absent: none
WHEREUPON five Council members voted for approval, Mayor Berner declared the
motion carried and approved Resolution 2012 -33 A RESOLUTION APPROVING
CHANGES IN TIFFIN DESIGN STANDARD SECTION 9.13 STORM WATER
MANAGEMENT FACILITIES be adopted and signified his approval of the same by
affixing his signature thereto.
Passed and Approved this 8th day of August, 2012.
Signed:
Steve Berner, Mayor
Attest:
Micâ–º "ckson, City Clerk/Administrator