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Imaginary surface

The airspace (primary, approach, transitional, horizontal, and conical surfaces) designated by the floor area ratio.

Impact fee schedule

The table of impact fees to be charged per unit of development, computed by the formula adopted under Chapter 22.88 MMC, indicating the standard fee amount per dwelling unit that shall be paid as a condition of residential development within the city.

Impervious surface

A hard surface area that either prevents or retards the entry of water into the soil mantle as under natural conditions prior to development or that causes water to run off the surface in greater quantities or at an increased rate of flow from the present under natural conditions prior to development. Common impervious surfaces include, but are not limited to, rooftops, walkways, patios, driveways, parking lots, storage areas, concrete or asphalt paving, gravel roads, packed earthen materials, and oiled macadam or other surfaces which similarly impede the natural infiltration of stormwater.

Incandescent bulb

A lamp that produces light through the application of electrical energy to a wire filament, which glows as it is heated.

Indoor fitness and health club

Commercial establishment having a membership and/or open to the general public to use its health and fitness equipment.

Indoor recreational facility

An entertainment use in which facilities for engaging in sports and recreation are provided within an enclosed structure, and in which any spectators are incidental and are not charged admission. Examples include but are not limited to bowling alleys, roller- and ice-skating rinks, dance halls, racquetball courts, physical fitness centers and gyms greater than three thousand five hundred square feet in area, and video game parlors.

Industrial use

A land use classification relating to, concerning, or arising from the assembling, fabrication, finishing, manufacturing, packaging, or processing of goods, or mineral extraction.


Infrastructure includes, but is not limited to, the roads, sanitary sewer, municipal water, curb, gutter, sidewalk and streetscape required in the development of a subdivision, including off-site mitigation for roads, schools, and parks.

Inpatient facilities, including substance abuse and mental health facilities

Establishments engaged in providing diagnostic, medical treatment, and monitoring services for inpatients who suffer from mental illness or substance abuse disorders. The treatment requires an extended stay in the hospital. These establishments maintain inpatient beds and provide patients with food services that meet their nutritional requirements. They have an organized staff of physicians and other medical staff to provide patient care services. Psychiatric, psychological, and social work services are available at the facility. These hospitals provide other services, such as outpatient services, clinical laboratory services, diagnostic X-ray services, and electroencephalograph services. Includes land uses specified in NAICS Industry Group No. 622210.

Institutional use

A nonprofit or quasi-public land use classification, such as a religious institution, library, public, or private school, hospital, or government-owned or government-operated structure or land used for public purpose.


The number of dwelling units per acre for residential development and floor area ratio and/or occupancy load for nonresidential development, such as commercial, office, and industrial uses.

Interest rate

The current interest rate as stated in the Bond Buyer Twenty-Bond General Obligation Bond Index.

(Ord. 033/2022 § 1 (Exh. A); Ord. 013/2019 § 2)