A. Right To Require Improvements: The city reserves the right to require improvements, provisions of drainage easements and for provision of agreements beyond the boundaries of the subdivision to facilitate flow of water through the addition, to avoid probability of law suits based on damage from changed runoff in the subdivision, and to provide continuous improvement of the overall storm drainage system.
B. Requirements: Requirements outside the addition may include the following:
1. Improvements may be required in channels or storm sewers flowing to or from the addition, or in channels or storm sewers located in adjacent areas that are affected by flow of water from the addition.
2. The following kinds of improvements may be required:
a. Enlargement or replacement of undersized drainage structures to provide free flow.
b. Removal of obstructions.
c. Straightening of channel.
d. Widening or deepening of the channel.
e. Construction of erosion control structures.
f. Back sloping, and/or riprapping of bank.
g. Construction of closed or open paved storm sewers.
C. Property Owner Agreements: Property owner agreements, where required, shall be designed to protect the city from probable law suits for damage caused by changed runoff condition.
D. Retention Reservoirs: When subdivision development will result in increased runoff beyond the boundaries of the subdivision, the city may require the construction of one or more retention reservoirs within the subdivision which will temporarily impound and discharge water from the site at the rate and volume equivalent to the discharge from the site when undeveloped. The design shall be for a 100-year frequency flood. Plans shall be approved by the city's consulting engineer, while the construction and maintenance of retention reservoirs shall be the responsibility of the developer. (Ord. 1978-10, 10-3-1978)