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ARTICLE C. POSTCONSTRUCTION STORMWATER MANAGEMENT
SECTION:
8-4C-1: Findings
8-4C-2: Definitions
8-4C-3: Applicability
8-4C-4: Submission And Approval Of The Postconstruction Stormwater Management Plan
8-4C-5: Inspection, Maintenance And Repair Of Stormwater Management Facilities
8-4C-6: City Of Waterloo Inspection Procedures
8-4C-7: Corrective Action
8-4C-8: Responsibility
8-4C-9: Enforcement
8-4C-10: Appeal
8-4C-11: Severability
A. The U.S. EPA's national pollutant discharge elimination system ("NPDES") permit program ("program") administered by the Iowa department of natural resources ("IDNR") requires that cities meeting certain demographic and environmental impact criteria obtain from the INDR an NPDES permit for the discharge of stormwater from a municipal separate storm sewer system (MS4) (the "MS4 permit"). The city is subject to the program and is required to obtain, and has obtained, an MS4 permit. The city's MS4 permit is on file at the office of the city clerk and is available for public inspection during regular office hours.
B. As a condition of the city's MS4 permit, the city is obliged to develop, implement and enforce a postconstruction stormwater management ordinance.
C. No state or federal funds have been made available to assist the city with inspections, monitoring activities and/or enforcing the program. Accordingly, the city shall fund its inspections, monitoring and enforcement responsibilities entirely by fees imposed on the owners of properties, which are made subject to the program by virtue of state and federal law, and/or other funding sources. Fees shall be determined from time to time by resolution of the city council. (Ord. 5030, 2-21-2011)
Terms and acronyms used in this article shall, unless defined in this article, have the meanings given to them in section 8-4-1 of this chapter.
APPLICANT: Any person, firm, sole proprietorship, partnership, corporation, state agency or political subdivision required by this article to develop a postconstruction stormwater management plan in conjunction with the development or redevelopment of land within the city of Waterloo.
APPLICANT'S ENGINEER: A licensed professional civil engineer, registered architect or registered landscape architect employed by the applicant who has primary responsibility for the design of the PC plan for the applicant's site.
CITY STORMWATER MANAGEMENT REQUIREMENTS: Are set forth in subsection 8-4C-4C of this article and are based, in part, upon the "Iowa Stormwater Management Manual".
DRAINAGE EASEMENT: A legal right granted by a landowner to a grantee allowing the use of private land for stormwater management purposes.
IOWA STORMWATER MANAGEMENT MANUAL: The manual collaboratively developed by the Iowa department of natural resources (INDR) and the Center For Transportation Research And Education (CTRE) - now the Institute For Transportation (InTrans) - at Iowa State University that contains the sizing criteria, design and specification guidelines and BMPs that address stormwater quality and quantity management. This manual can be found on the web at the following address: http://www.intrans.iastate.edu/pubs/stormwater/index.cfm
POSTCONSTRUCTION STORMWATER MANAGEMENT PLAN (PC PLAN): The set of plans, specifications, calculations and supporting materials approved by the city that defines the system of BMPs that are to be constructed and maintained on the site to handle the quantity and increase the quality of stormwater runoff created by development.
PROPERTY OWNER: A person who, alone or with another person or other persons, holds the legal title to property; except, however, where property has been sold on contract to a person who has the present right to possess the property and the contract has been filed for record in the office of the county recorder, in which case the person so purchasing the property, whether alone or with another person or other persons, is the "property owner", and the person retaining bare legal title to the property as a security for the balance of the purchase price is not the "property owner".
REGIONAL STORMWATER MANAGEMENT FACILITY: Facilities designed to accept stormwater runoff from two (2) or more sites that are required to comply with all city, state or federal stormwater management requirements.
SINGLE-FAMILY DWELLING: A detached residence designed for or occupied by one family only.
STORMWATER MANAGEMENT: The use of BMPs that are designed in accordance with city stormwater requirements to reduce stormwater runoff pollutant loads, discharge volumes, peak flow discharge rates and detrimental changes in stream temperature that affect water quality and habitat. (Ord. 5030, 2-21-2011)
A. This article shall apply to all development, redeveloped property or land disturbing activities within the city of Waterloo meeting the criteria stated below:
1. Land disturbing activity exceeding forty three thousand five hundred sixty (43,560) square feet or more in area on land previously vacant of buildings or largely free of previous land disturbing activity; or
2. Land disturbing activity creating five thousand (5,000) square feet or more in area of impervious surface; or
3. Land disturbing activity that is smaller than the minimum area criteria set forth in this subsection, if such activities are part of a larger common plan of development that may or may not take place at the same time; or
4. Construction of new parking and storage areas or the expansion, reconstruction or hard surfacing of existing parking lots or storage areas. The addition of granular material to the existing footprint of a granular surfaced parking lot or storage area shall not be considered reconstruction under this article.
B. Activities exempt from this article:
1. Development or redevelopment of property within the central business district, as defined in the current city of Waterloo zoning ordinance.
2. Any additions or modifications to existing single-family dwellings provided that said additions and/or modifications do not create a dwelling with impervious surfaces greater than five thousand (5,000) square feet.
3. Any logging activity consistent with an approved timber management plan.
4. Any agricultural activity consistent with an approved soil conservation plan.
C. No owner or developer of land subject to this article shall receive any building permits without first meeting the requirements of this article prior to commencing the proposed activity. (Ord. 5030, 2-21-2011)
A. Required Submittals: A complete postconstruction stormwater management plan (PC plan) requires that the following materials be submitted to the city engineering department:
1. Plans, specifications, calculations and supporting materials utilized to develop the applicant's PC plan;
2. Regional stormwater management facility repair and maintenance agreement, if applicable;
3. Drainage easement, if applicable; and
4. Stormwater pollution prevention plan (SWPPP), if applicable.
B. Submission Review Process: The city's PC plan submission review process shall proceed as follows:
1. The city shall review the submission for completeness. If an incomplete submission is received, the review shall be halted and the city shall inform the applicant of the additional materials that need to be submitted in order for the review to continue. The PC plan review period will begin anew when all materials have been submitted.
2. If during the review of the applicant's PC plan, elements are found that do not comply with the requirements of this section, the review shall be halted and the city shall send a written bill of particulars to the applicant and the applicant's engineer. The PC plan review period will begin anew when a revised PC plan is submitted. The city shall not issue approval of a PC plan until all noncomplying elements have been corrected.
3. The city shall send written notification to the applicant and the applicant's engineer of the approval of the applicant's PC plan within ten (10) business days following the applicant's submission of a complete and/or revised PC plan. (Ord. 5030, 2-21-2011)
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 location of existing and proposed:
(1) Buildings;
(2) Roads;
(3) Parking and storage areas;
(4) Utilities;
(5) Easements;
(6) Contours;
(7) Drainage patterns;
(8) Land disturbance limits;
(9) Stormwater management facilities;
(10) 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 existing contours, surface water drainage, including streams, ponds, culverts, ditches, and wetlands; current land uses, including 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 stormwater 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 inches of rain, shall be released at a continuous rate over twenty four (24) hours.
7. Hydrologic and hydraulic design calculations for the undeveloped and postdevelopment conditions for the 5-year, 10-year, and 100-year design storms. Such calculations shall include:
a. Description of the design storm frequency, intensity, duration;
b. Time of concentration;
c. Soil curve numbers or runoff coefficients;
d. Peak runoff rates and total runoff volumes for each watershed area;
e. Infiltration rates, where applicable;
f. Culvert capacities;
g. Flow velocities;
h. Data on the increase in rate and volume of runoff; and
i. Documentation of sources for all computation methods and field test results.
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.
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 three to one (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. (Ord. 5268, 3-2-2015)
E. Inspection Of Facility: The PC plan shall also include specifications for the inspection, maintenance and repair of the stormwater facility(ies).
F. Conceptual Plan: The city may require that the applicant file a conceptual plan to analyze the maximum development potential of a site under existing zoning regulations, regardless of whether the applicant presently intends to develop the site to its maximum potential.
G. Runoff: The proposed stormwater management facilities shall not cause downstream property owners, watercourses, channels, or conduits to receive stormwater runoff from the proposed development site at a higher peak flow rate than that allowed under subsection C6 of this section or the city stormwater detention policy in effect at the time of approval of the development.
H. As Built Drawing: After construction is completed, the applicant shall submit to the city "as built" drawings of the stormwater management facility, certified by a licensed professional civil engineer, registered architect or registered landscape architect.
I. Facilities Not Consistent With PC Plan: If the as built stormwater management facilities were constructed differently than the facilities described in the approved PC plan, the applicant shall provide to the city calculations that the constructed stormwater facilities provide the same or greater stormwater control and treatment as the facilities originally approved by the city.
J. Documentation: In the event the property owner(s) and the city agree that the constructed stormwater management facilities are to be accepted by the city, the property owner(s) shall provide documentation as the city determines is appropriate. This documentation may include, but is not limited to: as built plans, a two (2) year maintenance bond, construction test results, material certifications, and itemized construction costs.
K. Maintenance And Repair Agreement: If the submitted PC plan is for a development utilizing a regional stormwater management facility, the applicant shall submit a maintenance and repair agreement with the PC plan. Said agreement shall be between the applicant and the owner(s) of the property the regional stormwater management facility is located on and shall detail the responsibilities of each party regarding inspection, maintenance and repair of the facility and the payment of the costs incurred for those activities. This agreement shall be filed in the office of the county recorder and shall be binding upon all owners of the properties involved until the facility is removed or is no longer used by the property sending stormwater.
L. Drainage Easement: If the use of a regional stormwater facility requires the creation of a drainage easement to allow water to flow between properties, the applicant shall provide copies of the drainage easement between the owners of the affected properties. This document shall describe the location of the easement and shall detail the responsibilities of the parties involved regarding the inspection, maintenance and repair of the easement area and payment for costs incurred for those activities. This easement shall be filed in the office of the county recorder and be binding upon all properties involved until such time as the easement is no longer needed.
M. Review Of PC Plan Not Determination Of Effectiveness: The city's review of the applicant's PC plan is not a determination of the effectiveness of the controls shown in the PC plan. (Ord. 5030, 2-21-2011)
Each property owner(s) and successor property owners shall be responsible for inspecting and maintaining the stormwater management facilities located on the property.
The owner(s), successor owners and benefactors of a regional stormwater management facility shall be jointly and severally responsible for inspecting and maintaining the regional stormwater management facility.
A. Inspections: The property owner(s), successor property owners and benefactors shall ensure that the stormwater management facilities, devices and structures are periodically inspected. Periodic inspections shall be completed as needed and in no case less than one time per year. Failure to conduct inspections shall be considered a violation of this article. This inspection requirement shall also apply to all existing stormwater management facilities constructed before the adoption of this article.
B. Maintenance And Repair: All property owner(s), successor property owners and benefactors of a stormwater management facility shall ensure that all stormwater management facilities, devices and structures be maintained in accordance with the approved PC plan to provide for the proper functioning of the facilities. This maintenance and repair requirement shall also apply to all existing stormwater management facilities constructed before the adoption of this article. If facility repairs are needed, the repairs shall be conducted in a timely manner. Failure to conduct repairs in a timely manner shall be considered a violation of this article.
C. Inspection, Maintenance And Repair Documentation: All inspections, maintenance and repairs shall be documented. The property owner(s) or their assigns shall retain these documents for at least ten (10) years. Copies of all documentation shall be made available to the city upon request.
A copy of the certified "as built" construction plans for the stormwater management facility shall be included with the inspection, maintenance and repair documentation. (Ord. 5030, 2-21-2011)
A. The city engineer or his designee shall conduct all inspections undertaken by the city under this article.
B. The city shall be permitted to enter and inspect, at any reasonable time, any property with stormwater management facilities to determine compliance with this chapter, including stormwater management facilities constructed before the adoption of this article. Additionally, the city may request that a property owner verify, through the preparation of plans or a report completed by an applicant's engineer, that the stormwater management facilities continue to have the same capacities and operational characteristics as originally designed and approved.
C. Failure of the property owner to allow access to the property shall constitute a violation of this article. (Ord. 5030, 2-21-2011)
A. In the event that a stormwater management facility is found to be in noncompliance with the approved plans, the city will deliver to the property owner a written bill of particulars that identifies any noncompliant element or condition. The property owner shall have fourteen (14) days from the date of notice to provide to the city a written response outlining the steps and implementation time lines for corrective action. The property owner shall have thirty (30) days from the date of notice to complete the corrective action necessary to bring the stormwater management facility back into compliance with the approved plans. For good cause shown, the city may extend the deadline for taking corrective action.
B. Following the review of the property owner's written response, if extenuating circumstances exist which make implementation of the necessary corrective action difficult to complete within the time period specified above, the city may, at its sole discretion, grant a reasonable extension of time to complete the corrective action if requested by the property owner.
C. Failure of the property owner to provide a written response or undertake corrective action shall constitute a violation of this article and shall be deemed a nuisance, which the city may summarily abate or restore at the property owner's expense in accordance with the procedures set forth in section 8-4-15 of this chapter. Appeal of such action shall be pursuant to section 8-4-16 of this chapter and not section 8-4C-10 of this article. The city's costs to abate the nuisance shall, if not paid, constitute a lien against the property and shall be assessed against the property pursuant to Iowa Code section 364.12 for collection in the same manner as a property tax. (Ord. 5030, 2-21-2011)
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