Ord 2016-050/revisions to the San Marcos City Code of Ordinance Chapter 39: Flood Damage Prevention Ordinance

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(3) Removal of significant tree stands within a floodplain; (4) Site preparation for construction of structures or improvements, including grading or removal of topsoil within a floodplain. (c) Authority. The regulations in this Article are authorized under the City's Charter, V.T.C.A., Water Code § 16.315 and § 26.1.77. (d) Exceptions. Fill -in drainageways that are not mapped by FEMA are exempt from the requirements of this article provided that the watershed area contributing to the floodplain that is affected by placement of fill is wholly owned by the applicant. (e) Coordination of applications. If jurisdictional waters of the United States exist on the property to be reclaimed, the applicant shall provide the city with a copy of all reports, studies, plans and other data that are submitted to the U.S. Army Corps of Engineers in conjunction with an application for approval of a Federal Section 404 permit. Sec. 39.49.1. Fill. (a) Fill sites, upon which structures will be constructed or placed, must be compacted to 95 percent of the maximum density obtainable with the Standard Proctor Test method or an acceptable equivalent method; (b) Fill slopes shall not be steeper than one foot vertical to two feet horizontal; (c) Adequate protection against erosion and scour is provided for fill slopes. When expected velocities during the occurrence of the base flood are greater than five feet per second armoring with stone or rock protection shall be provided. When expected velocities during the base flood are five feet per second or less protection shall be provided by covering them with vegetative cover; (d) Fill shall be composed of clean granular or earthen material. Sec. 39.49.2. Compensatory Storage. Fill within the special flood hazard area shall result in no net loss of natural floodplain storage, or increase in water surface elevations during the base flood. The volume of the loss of floodwater storage due to filling in the special flood hazard area shall be offset by providing an equal volume of flood storage by excavation or other compensatory measures at or adjacent to the development site. Sec. 39.050. Preservation of natural features. No wetlands or other significant natural features shall be reclaimed within a water quality zone or buffer zone established under articles 1, 2 or 3 of chapter 5 of the city's land development code authorized under a mitigation plan prepared in accordance with this