§ 35-33. Levees.

(a)

The requirements established in this section for levee improvements apply to new levee systems. The requirements do not apply to existing levee systems or modifications to existing levee systems. In the event that an owners desires to build new levees to protect an area from flooding, applicable FEMA and State of Texas guidelines and the all of the following criteria shall apply:

(1)

Levees shall be designed to have a minimum of four (4) feet of freeboard above the standard project flood for the fully developed watershed flows.

(2)

Levees shall be designed according to the Corps of Engineers design criteria whether or not they are federally authorized levees.

(3)

Levee systems shall be designed with interior drainage systems to prevent flooding from local runoff contained within the system for the 100-year design flood.

(4)

Levee systems shall have written operation procedures that address gate closure conditions and an emergency warning plan. A copy of these procedures shall be furnished to the city engineer.

(5)

Automated gate closure systems shall have power from two (2) independent sources and shall be capable of being operated manually.

(6)

Ring levees protecting individual structures proposed for construction after the enactment date of this ordinance shall not be permitted.

(7)

All new levee systems shall have permanent positive closures to the required design elevation. Temporary closures involving sandbagging or other procedures requiring manual operations shall not be permitted.

(8)

Provisions shall be made for ensuring the permanent maintenance of levees either by a flood control district or similar governmental organization or by the existing property owner and all future owners, heirs, or assigns.

(9)

Additional plan requirements include water surface profiles for the design flood and SPF; top of levee profile, definition of interior drainage facilities, including pump station and ponding areas; location of gravity outlets, gatewells and closure structures; and elevation-duration data on the receiving system.

(Ord. No. 2017-10008, § II, 10-26-17)