HomeMy WebLinkAbout5268-3/2/2015Prepared by Carol Nemmers, Deputy City Clerk, City of Waterloo,
715 Mulberry Street, Waterloo, IA 50703, (319) 291-4323.
ORDINANCE NO. 5268
ORDINANCE AMENDING THE 2007 CODE OF
ORDINANCES OF THE CITY OF WATERLOO, IOWA, BY
AMENDING SUBSECTION C, OF SECTION 4, OF
ARTICLE C, POSTCONSTRUCTION STORMWATER
MANAGEMENT, OF CHAPTER 4, STORMWATER
MANAGEMENT PROGRAM, OF TITLE 8, PUBLIC
UTILITIES.
BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF WATERLOO,
IOWA:
That Subsection C, of Section
Postconstruction Stormwater Management,
Water Management Program, of Title 8,
hereby amended as follows:
4, of Article C,
of Chapter 4, Storm
Public Utilities, is
TITLE 8
CHAPTER 4
STORM WATER MANAGEMENT PROGRAM
ARTICLE C. POSTCONSTRUCTION STORMWATER MANAGEMENT
C. PC PLAN REQUIREMENTS: Every PC plan submitted to the city
shall include a plan detailing the control, operation and
maintenance of the proposed stormwater management facility
or facilities, shall comply with standards approved by the
city engineer and shall include the following:
1. Be prepared by the applicant's engineer;
2. The following statement signed and dated by the
applicant:
"The undersigned Applicant hereby agrees to defend,
indemnify and hold the City of Waterloo harmless from
any and all claims, damages or suits arising directly
or indirectly out of any act of commission or omission
by the Applicant, or any employee, agent, assignee or
contractor or subcontractor of the Applicant, in
connection with Applicant's Post -Construction
Stormwater Management Plan."
3. Contact information, including the name, address and
phone number of the property owner(s);
4. A map or maps indicating the following:
a. The
(1)
(2)
(3)
(4)
(5)
location of existing and proposed:
Buildings;
Roads;
Parking and storage areas;
Utilities;
Easements;
Ordinance No. 5268
Page 2
Contours;
Drainage patterns;
Land disturbance limits;
Stormwater management facilities;
Sediment, erosion and pollution control
BMPs.
b. For all developments five (5) acres or greater in
size, a map of the site which extends a minimum
of two hundred fifty feet (250') beyond the
limits of the proposed development that
indicates
drainage,
ditches,
including
existing contours, surface water
including streams, ponds, culverts,
and wetlands; current land uses,
all existing structures; locations of
utilities, roads and
easements; and significant
natural and manmade features.
5. A tabulation of the percentage of surface area to be
adapted to various uses;
6. The stormwater management facilities constructed shall
detain all on site storm water runoff equal to the
differences between the total stormwater runoff
generated from a 100 -year design storm as applied to
the entire property, including the proposed and
future, if applicable, improvements and a 5 -year
design storm as applied to the entire property prior
to any development. Rainfall events, up to and
including 1.25" of rain, shall be released at a
continuous rate over twenty-four (24) hours.
7. Hydrologic
undeveloped and postdevelopment conditions for
yr, 10 -yr, and 100 -yr design storms.
and hydraulic design calculations for the
the 5 -
Such
calculations shall include:
a. Description of the design storm frequency,
intensity, duration:
Time of concentration;
Soil curve numbers or runoff coefficients;
Peak runoff rates and total runoff volumes for
each watershed area;
Infiltration rates, where applicable;
Culvert capacities;
Flow velocities;
Data on the increase in rate and volume of
runoff; and
i. Documentation of sources for all computation
methods and field test results.
b.
c.
d.
e.
f.
g -
h.
8. If a stormwater management facility depends on the
hydrologic properties of the soils (e.g., infiltration
basins), then a report detailing the existing soil
conditions and percolation test results shall be
submitted.
Ordinance No. 5268
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The soils report shall be based on on-site boring logs
or soil pit profiles. The number and location of
required soil borings or soil pit profiles shall be
determined based on what is necessary to determine the
suitability and distribution of soil types present at
the location of the facility.
The percolation test results shall be based on on-site
percolation tests. The number and location of the
percolation test sites shall be determined based on
the soils report of the existing soil conditions and
the location(s) of the proposed stormwater management
facility.
9. For development occurring on a previously developed
site, the PC plan shall include existing stormwater
runoff discharges.
10. Multiple submissions of a PC plan shall include a
summary of differences between the new PC plan and the
previously submitted PC plan.
D. Consideration of Facility Design and Practices: All slopes
with a 3:1 ratio or greater must receive sod, seed with
mat cover, fabric with rock cover, or an equivalent soil
stabilization measure approved by the city engineer. BMPs
utilized shall have clear citations to the `°Iowa Stormwater
Management Manual," latest edition, or alternative
standards as approved by the city engineer. All
landscaping components and soil stabilization practices
shall comply with existing city zoning and stormwater
erosion and sediment control requirements.
INTRODUCED:
PASSED 1ST CONSIDERATION:
PASSED 2ND CONSIDERATION:
PASSED 3RD CONSIDERATION:
March 2, 2015
March 2, 2015
March 2, 2015
March 2, 2015
PASSED AND ADOPTED this 2nd day of March, 2015.
Ernest G. Clark, Mayor
ATTEST:
Suzy S hares, CMC
City clerk
Ordinance No. 5268
Page 4
CERTIFICATE
I, Suzy Schares, City Clerk of the City of Waterloo, Iowa,
do hereby certify that the preceding is a true and complete copy
of Ordinance No. 5268, as passed and adopted by the City Council
of the City of Waterloo, Iowa, on the 2nd day of March, 2015.
2015.
SEAL
Witness my hand and seal of office this 2nd day of March,
JA (X /C({)
Suzy Sc ares, CMC
City C1-rk