HomeMy Public PortalAboutResolution 16-10 Stormwater Design Criteria ModificationsCity of McCall
RESOLUTION NO. 16-10
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF McCALL, VALLEY
COUNTY, STATE OF IDAHO, APPROVING STORMWATER DESIGN CRITERIA
MODIFICATIONS TO THE CITY OF MCCALL'S DRAINAGE MANAGEMENT
GUIDELINES.
WHEREAS, Ordinance 822 and Title 9, "Subdivision and Development Regulations" of the
McCall City Code authorizes the use of the Drainage Management Guidelines (Toothman-Orton
Engineers, 1997) for designing stormwater management systems and preparing stormwater
drainage reports; and
WHEREAS, the City Council of the City of McCall has determined that it would benefit future
land development, improve stormwater management facility design, and facilitate engineering
approval and administration of stormwater regulations within the City, to adopt certain design
criteria defined in this resolution:
NOW, THEREFORE, BE IT RESOLVED BY THE MAYOR AND COUNCIL OF THE CITY
OF McCALL, IDAHO, AS FOLLOWS:
Section 1: The following alternative criteria may be used for sizing first flush treatment systems
or other detention systems where the 2 year, 24 hour storm is currently identified:
A. Storm Size = 0.81", 95% storm based on McCall historic rainfall (1960-2015)
B. When site specific soils information has been provided and validated by a geotechnical or
otherwise qualified professional engineer or published soils report, such soil definitions
may be considered for sizing first flush water quality treatment systems. Final approval of
alternative soil classifications must be affirmed by the City Engineer. For all other
hydraulic modeling (peak flow attenuation, conveyance pipe sizing, etc.) Type C soils, as
defined in the Drainage Management Guidelines (Toothman-Orton Engineering, 1997),
shall be used.
Section 2: For purposes of sizing stormwater management facilities (excluding first flush water
quality treatment facilities), the following 24-hour storm sizes shall be used:
A. 10-year storm = 1.83 inches
B. 25-year storm = 2.05 inches
C. 100-year storm = 2.32 inches
Resolution 16-10 Stormwater Criteria
March 24, 2016
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Section 3: This Resolution shall be in full force and effect immediately upon its adoption and
approval.
PASSED and approved by the City Council of the City of McCall this 24 day of March, 2016.
ATTEST:
1 certify that the above Resolution was duly adopted by the City Council of the City of McCall on
March 24, 2016 by the following vote: Ayes: 3
Noes: -e -
Absent: o)
Resolution 16-10 Stormwater Criteria
March 24, 2016
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