15.02.080 - Determination of fee (formula).

The amount of surface water runoff shall be established by using the following tables and formula: A.

Rainfall Factor: The fee shall be assessed on the basis of 1.4 inches of rainfall per hour (which is the acceptable one-hundred-year standard). This shall be known as factor A in the formula.

B.

Area Factor: The rainfall factor shall be multiplied by the number of acres in the development or subdivision. This factor shall be known as factor B in the formula.

C.

Land Use Factor:

1.

The following table shall be used to determine the runoff from various types of development:

General Land Use Classification Runoff Coefficients

Undeveloped 0.15

Residential:

Single-family 0.35

Two-family 0.45

Multiple-family 0.60

Suburban estates 0.25

Commercial:

Neighborhood 0.60

General 0.80

Drive-in movies 0.70

Industrial:

Light 0.60

Heavy 0.80

Agriculture 0.15

Institutional 0.30

Parks and recreation: 0.20

Utilities and transportation 0.50

Streets 0.85

Vacant 0.15

Other: determined by City Engineer

2.

Differential runoff will be determined by evaluating the land use before the development C1 and after the development C2. The difference (C2 - C1) will be multiplied by the factors A and B to determine the additional runoff in cubic feet per second.

D.

The number of cubic feet per second of increased runoff caused by the proposed development shall be known as Factor f.

E.

The formula for determining the service fee for water runoff and storm drain shall be determined by the following formula:

A × B × (C 2 − C 1 ) = F

F × amount set by resolution of

the City Council = Service Fee.

(Ord. No. 2020-02, § III(Exh. B), 1-8-2020)