Packet: Tiffin City Council Work Session (09/15/2026)

CHAPTER 161 POST-CONSTRUCTION STORMWATER RUNOFF CONTROL 161.10 COMPLIANCE REQUIRED. Each development subject to the requirements of this chapter will comply with the City’s mandate to improve stormwater quality and manage stormwater quantity within the City. The developer is deemed to have complied with the City’s mandate to improve stormwater quality and manage stormwater quantity if the development: 1. Treats the water quality volume resulting from a rainfall depth of 1.25 inches in accordance with the City stormwater standards. 2. Provides channel protection storage volume and extended detention in accordance with the City stormwater standards. 3. Provides overbank flood protection in accordance with the City stormwater standards. 4. Provides an emergency overflow spillway (including one-foot freeboard) and designated overflow route for extreme rainfall events. The spillway must be designed for the 100-year event and assuming the initial outlet controls are completely blocked. 5. Provides stormwater BMP facilities which are constructed and function in accordance with the approved design. The property owner or applicant must provide to the City an as-built plan detailing dimensions and elevations as well as certification that the approved facilities were installed and properly working. The as-built plan must be completed by an Iowa-licensed professional engineer and submitted to the City prior to the acceptance of any improvements or issuance of any certificates of occupancy. 6. Provides for all BMPs selected to be utilized in each development to be designed, constructed, and maintained as required by the City stormwater standards. 161.11 MAINTENANCE AND REPAIR OF STORMWATER BMPS. 1. The landowner or developer of every site subject to the provisions of this chapter will be responsible for maintaining as-built stormwater BMPs in an effective state as determined in the sole judgment of the City for 25 years after completion of construction. 2. Prior to the issuance of any permit for development involving any stormwater BMP, the landowner or developer must execute a stormwater management easement for each BMP in a form acceptable to the City. The easement will provide for access to the BMP by the City for periodic inspection. The easement must be recorded at the expense of the landowner or developer. 3. Prior to the issuance of any development permit, the landowner or developer must execute a stormwater BMP maintenance agreement in a form acceptable to the City that requires the landowner or developer to inspect and maintain each stormwater BMP for a period of 25 years. The Maintenance and Repair Agreement must include but is not limited to the following: A. Sediment Forebay. (1) Install Depth Marker and Monitor Sediment Build-Up. Monitor and remove sediment after accumulation of 33 percent of original depth. (2) Remove trash and debris as needed. (3) Inspect filter strip and re-seed or sod on a semi-annual basis. CODE OF ORDINANCES, TIFFIN, IOWA - 1431 -