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CHAPTER 149: CONTROL OF STORM WATER DRAINAGE
149.01 PURPOSE. The purpose of this chapter is to set requirements for the control of storm water drainage in connection with the construction of impervious surface area such as hard surface parking, driveways, building roofs, etc. It must be recognized that the flow of surface water is greatly increased with the construction of impervious surface area as compared to the original vegetation ground cover. It must also be recognized that underground storm sewer drainage is normally designed at a capacity level of two inches per hour. When rainfall events exceed storm sewer capacity, swales or other surface grade provisions must be made around buildings to accommodate excess runoff. This is imperative for lots that are located in a natural water course.
149.02 THREE LEVELS OF SURFACE DRAINAGE REQUIREMENTS. There are three levels of surface drainage requirements listed hereafter. The applicable level is based upon the square feet of impervious surface on a contiguous site (not separated by public right-of-way). The impervious surface area is the square footage of the proposed improvement or combination of existing and proposed impervious surface area on the site. Credit will be allowed if an existing impervious surface area is replaced with another surface within one year. The replaced square footage will be deducted from the total square footage of the new impervious area.
- Level 1: 0 – 7,000 square feet of impervious surface area. Storm water runoff to be reduced by using reasonably acceptable measures.
- Level 2: 7,001 – 30,000 square feet impervious surface area. Allowable runoff from the site shall be equal to that of a rainfall intensity of two inches per hour for residential development. When the calculated allowable runoff is exceeded, storm water detention must be designed with a minimum capacity of 50% of the difference between the allowable runoff and a 100-year rainfall event. Also, the site plan must clearly describe where storm water that is not detained will flow off the site. A partial or full variance may be granted, with conditions, by the City only if detention is determined to be unnecessary or impractical.
- Level 3: Above 30,000 square feet impervious surface area. Allowable runoff from the site shall be equal to that of a rainfall intensity of two inches per hour for residential development. When the calculated allowable runoff is exceeded, storm water detention must be designed with a minimum capacity of 100% of the difference between the allowable runoff and a 100-year rainfall event. Also, the site plan must clearly describe where storm water that is not detained will flow off the site. A partial or full variance may be granted, with conditions, by the City only if detention is determined to be unnecessary or impractical. Calculations must be certified by a professional engineer licensed in the State of Iowa and familiar with storm water detention calculations.
149.03 ACCEPTABLE TEMPORARY DETENTION. Acceptable temporary detention may include but is not limited to: on- or off-site detention, on- or off-site absorption areas, joint detention for multiple properties, and provisions made for entire subdivisions.
149.04 WHEN A DETENTION VARIANCE IS GRANTED. When a partial or full detention variance is granted, a fee shall be applied to compensate the City for its costs of making drainage improvements related to the additional surface runoff. The fee calculation shall be six dollars ($6.00) per cubic foot of storm water detention excused by the variance. The fee shall be paid upon completion of construction.
149.05 BUILDING CONSTRUCTION. When building construction takes place on property located in or near a natural surface water drainage area or swale, provisions must be made for excess surface water flows. Any building placed in such an area must be constructed with adjoining grade at least 6″ above the elevation of any downstream surface constraint. In addition, adequate swale provisions must be constructed on the property to allow excess runoff water to flow around the building without blocking or unreasonably restricting surface flows in the natural drainage area.
CHAPTER 150: BUILDING NUMBERING
150.01 DEFINITIONS. For use in this chapter, the following terms are defined:
- “Owner” means the owner of the principal building.
- “Principal building” means the main building on any lot or subdivision thereof.
150.02 OWNER REQUIREMENTS. Every owner shall comply with the following numbering requirements:
- Obtain Building Number. The owner shall obtain the assigned number to the principal building from the Clerk. (Code of Iowa, Sec. 364.12[3d])
- Display Building The owner shall place or cause to be installed and maintained on the principal building the assigned number in a conspicuous place to the street in figures not less than two and one-half (2½) inches in height and of a contrasting color with their background. (Code of Iowa, Sec. 364.12[3d])
- Failure to Comply. If an owner refuses to number a building as herein provided, or fails to do so for a period of thirty (30) days after being notified in writing by the City to do so, the City may proceed to place the assigned number on the principal building and assess the costs against the property for collection in the same manner as a property tax. (Code of Iowa, Sec. 364.12[3h])
150.03 BUILDING NUMBERING PLAN. Building numbers shall be assigned in accordance with the building numbering plan on file in the office of the Clerk.
CHAPTER 151: TREES
151.01 DEFINITION. For use in this chapter, “parking” means that part of the street, avenue or highway in the City not covered by sidewalk and lying between the lot line and the curb line; or, on unpaved streets, that part of the street, avenue or highway lying between the lot line and that portion of the street usually traveled by vehicular traffic.
151.02 PLANTING RESTRICTIONS. No tree shall be planted in any parking or street except in accordance with the following:
- All trees planted in any street shall be planted in the parking midway between the outer line of the sidewalk and the curb. In the event a curb line is not established, trees shall be planted on a line ten (10) feet from the property line.
- Trees shall not be planted on any parking which is less than nine (9) feet in width, or contains less than eighty-one (81) square feet of exposed soil surface per tree. Trees shall not be planted closer than twenty (20) feet from street intersections (property lines extended) and ten (10) feet from driveways. If it is at all possible trees should be planted inside the property lines and not between the sidewalk and the curb.
- Prohibited Trees. No person shall plant in any street any fruit-bearing tree or any tree of the kinds commonly known as cottonwood, poplar, box elder, Chinese elm, evergreen, willow or black walnut.
151.03 DUTY TO TRIM TREES. The owner or agent of the abutting property shall keep the trees on, or overhanging the street, trimmed so that all branches will be at least fifteen (15) feet above the surface of the street and eight (8) feet above the sidewalks. If the abutting property owner fails to trim the trees, the City may serve notice on the abutting property owner requiring that such action be taken within seven (7) days. If such action is not taken within that time, the City may perform the required action and assess the costs against the abutting property for collection in the same manner as a property tax. (Code of Iowa, Sec. 364.12[2c, d & e])
151.04 TRIMMING TREES TO BE SUPERVISED. Except as allowed in Section 151.03, it is unlawful for any person to trim or cut any tree in a street or public place unless the work is done under the supervision of the City.
151.05 DISEASE CONTROL. Any dead, diseased or damaged tree or shrub which may harbor serious insect or disease pests or disease injurious to other trees is hereby declared to be a nuisance.
151.06 INSPECTION AND REMOVAL. The Council shall inspect or cause to be inspected any trees or shrubs in the City reported or suspected to be dead, diseased or damaged, and such trees and shrubs shall be subject to the following:
- City Property. If it is determined that any such condition exists on any public property, including the strip between the curb and the lot line of private property, the Council may cause such condition to be corrected by treatment or removal. The Council may also order the removal of any trees on the streets of the City which interfere with the making of improvements or with travel thereon.
- Private Property. If it is determined with reasonable certainty that any such condition exists on private property and that danger to other trees or to adjoining property or passing motorists or pedestrians is imminent, the Council shall notify by certified mail the owner, occupant or person in charge of such property to correct such condition by treatment or removal within fourteen (14) days of said notification. If such owner, occupant or person in charge of said property fails to comply within 14 days of receipt of notice, the Council may cause the condition to be corrected and the cost assessed against the property.
(Code of Iowa, Sec. 364.12[3b & h])