Section
General Provisions
55.01 Purpose
55.02 Authority
55.03 Conflicting ordinances
55.04 Compliance with other ordinances
55.05 Definitions
55.06 Stormwater control policy
55.07 Permits for construction in the floodway
55.08 Prior approvals
55.09 Site excavation prior to plan approval
Design Standards
55.20 Stormwater plan submittal requirements
55.21 Determination of runoff quantities
55.22 Amount of runoff to be accommodated by various parts of drainage facility
55.23 Storm sewer design standards
55.24 Workmanship and materials
55.25 Open channel design standards
55.26 Construction and materials
Detention Requirements
55.40 Stormwater detention
55.41 Waivers
Project Completion
55.60 Certifications required
55.61 Changes in plan
55.62 Other requirements
Enforcement
55.90 Disclaimer of liability
55.91 Violations
55.92 Appeals
55.99 Penalties
Cross-references:
Erosion control requirements, see Chapter 159
Illicit stormwater discharges and connections, see Chapter 56
GENERAL PROVISIONS
(A) It is recognized that the smaller streams and drainage channels serving the city may not have sufficient capacity to receive and convey stormwater runoff resulting from continued urbanization. Accordingly, the storage and controlled release rate of excess stormwater runoff shall be required for any development, redevelopment and new construction located within the city which requires development plan approval under Chapter 158 of the City Code of Ordinances, or which requires subdivision plat approval under Chapter 156 of the City Code of Ordinances.
(B) The release rate of stormwater from development, redevelopments, and new construction may not exceed the stormwater runoff from the land area in its present state of development. The developer must submit to the city detailed computations of runoff before and after development, redevelopment or new construction, which demonstrate that runoff will not be increased.
(C) These computations must show that the control devices will limit the discharge to a rate such that the release rate from the site is no greater than the two-year predeveloped rate for 0-10 year return interval storms and the ten-year predeveloped rate for 11-100 year return interval storms. That is, all storms up to and including the ten-year return period storm must be detained at a release rate below the predeveloped peak two-year return period stormwater runoff rate. The release rate for developments and redevelopments for the 11-100 year return period storms shall not exceed the predeveloped peak ten-year return period rate. Note: The allowable release rates may be reduced from these levels if downstream restrictions exist.
(D) Computations for areas up to and including 200 acres may be based on the Rational Method; typical runoff coefficients are listed herein. For areas larger than 200 acres, hydrography techniques and/or computer drainage modeling methods may be used. Hydrograph techniques and computer modeling methods used to determine stormwater runoff shall be proven methods subject to approval of the Commission.
(Ord. 16-C-98, passed 6-9-98; Am. Ord. 22-C-98, passed 8-11-98; Am. Ord. 22-C-04, passed 11-9-04; Am. Ord. 3-C-05, passed 3-15-05)
(A) The city Advisory Plan Commission has exclusive control over the approval of stormwater drainage plans required by this chapter.
(B) The City Engineer is hereby authorized and directed to administer and enforce all of the provisions of this chapter.
(C) This chapter shall apply to all areas within the jurisdiction of the city Advisory Plan Commission.
(Ord. 16-C-98, passed 6-9-98; Am. Ord. 22-C-04, passed 11-9-04)
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