(A) Determining the REF. The accumulated direct runoff (Q) used to determine the REFs shall be calculated based on an evaluation of the land use and application of a standardized soil type and rainfall event.
(B) The calculated direct runoff (Q) shall be based on the runoff equation in the Soil Conservation Services (SCS) National Engineering Handbook Section 4 - Hydrology. The City has utilized SCS TR-55 “Runoff Curve Numbers for Urban Areas,” and a two-inch rainfall to determine runoff from varied land uses, and to establish REF values.
(C) The established “REF” for various zoning classifications in the city is as follows:
Zoning Classification | REF |
Undeveloped/Vacant Land/Bluffs | 0.843 |
RS/AG | 0.535 |
NRSF/LDSF | 0.640 |
R1, R2, R3 | 1.000 |
B1, B2 | 1.643 |
LI, GI | 1.419 |
(1) The average single family lot in the City of Dundas is 0.315 acres. This results in 3.177 single family lots per acre.
(2) For multiple family housing developments with a homeowners association (HOA), the fee will be charged as follows: the total fee for all parcels in the HOA, including common areas and private roads, will be divided equally among all tax parcels with living units.
(3) The minimum annual fee shall be determined by the City Council, but shall not be less per acre than that for a residential lot.
(4) For any residential parcel exceeding 20,000 square feet, in a residentially zoned area (R1, R2, R3), the first 20,000 square feet will be charged a fee at the residential rate, and the balance of the square footage will be charged at the “Undeveloped Properties” rate.
(D) The REF for land uses not listed above shall be determined by the city based on probable hydrologic response.
(Ord. 2014-01, passed 3-24-2014)