A. Classification: For the purposes of this title, drainage shall be classified as follows:
1. Surface drainage is runoff of such a limited quantity and/or slow rate that it does not cause erosion of a defined channel.
2. A minor tributary is any drainage channel having a drainage basin of six hundred forty (640) acres (one square mile) or less in area.
3. A major tributary is any channel having a drainage basin of not less than one square mile or greater than twenty five (25) square miles.
4. A river is any channel having a drainage basin of greater than twenty five (25) square miles.
B. Responsibility: It is intended that responsibility for drainage be allocated as follows, unless otherwise specifically designated:
1. The developer of a subdivision is responsible for the following:
a. All surface drainage on the subdivision.
b. All increase in surface drainage outside the subdivision which results from the development of the subdivision.
c. The improvement of all minor tributaries lying within the subdivision.
d. Any significant increase in rate or quantity of runoff in any minor or major tributary or river which results from the development of the subdivision.
e. Provision for the maintenance of all floodway and flood fringe areas of major tributaries and rivers which have not been dedicated to the public.
2. The city and other levels of government will be responsible for the following:
a. The improvement of floodways or major tributaries.
b. The improvement of river floodways.
c. The maintenance of floodway and flood fringe areas dedicated to the public. (Ord. 1978-10, 10-3-1978)