ORD-2025-01 Development Code Effective January 25, 2025

6

CHAPTER

Environmental Regulations

Article 2: Enhanced Protection Zones

E. Exceptions to stormwater quality and stream protection volume requirements are allowed under the following conditions provided that disconnected impervious cover and treatment through vegetative filter strips or similar means is included: 1. Development applications proposing solely the construction or expansion of a single family home. 2. Plats of four (4) lots or less where the lots subdivided from the parent parcel do not exceed 0.5 acres each, are restricted by zoning or deed to 65% impervious cover or less, and are served by an existing street. An exemption is not allowed for the submittal of a series of plats of four (4) lots or less with the intention of producing a tract that is greater than four (4) lots. (This Section was approved by Ord. No. 2020-60, 9-1-2020 and by Ord. No 2021-47, 8-3-21, Ord. No. 2023-72, 10-17 2023) Section 6.1.4.2 Flood Control Refer to Chapter 3, Article 9: Stormwater Collection and Drainage Conveyance Systems for flood control performance standards.

Division 1: GENERAL

Section 6.2.1.1 Purpose, Applicability and Exceptions

A. Purpose. The purpose of the standards in this Division are to protect water quality in more sensitive areas and to prevent flood damage throughout the City and its Extraterritorial Jurisdiction. B. Applicability. This Article applies to development affecting any waterway including the Blanco and San Marcos Rivers located within the City or its Extraterritorial Jurisdiction unless otherwise stated in this Development Code C. Designation required. The water quality zones and buffer zones required by this Article shall be designated when a plat is required for a development, and shall be shown on all associated watershed protection plans, plats, site permits, and building plans. Unless required by the Responsible Official to be dedicated as a flowage easement and dedicated for public maintenance, water quality zones and buffer zones shall be privately held and maintained. A. A water quality zone shall be established for each waterway. Water quality zone have been predetermined by the City for certain waterways. A map of such predetermined water quality zones is on file with the City’s Planning and Development Services Department and is available upon request. For waterways not associated with a predetermined water quality zone by the City, the following options are available: 1. FEMA-mapped Option. For any waterway with a FEMA defined floodway, a water quality zone shall be established 100 feet in width, measured from the boundary of the defined floodway on each side of the waterway if located outside the EARZ, or as all land within a distance of 100 feet from a bank of the San Marcos River or a side channel that returns to the main channel, whichever is greater, (Ord. No. 2023-72, 10-17-2023) Division 2: ZONE DESIGNATION Section 6.2.2.1 Water Quality Zones

6:8

San Marcos Development Code Amended: January 21, 2025