San Marcos Development Code (effective November 3, 2021)

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C H A P T E R

Environmental Regulations

Article 2: Enhanced Protection Zones

D. 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) Section 6.1.4.2 Flood Control Refer to Chapter 3, Ar ticle 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 Ar ticle 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 and except as follows: 1. Any waterway having a drainage basin of less than 50 acres outside the EARZ, Transition Zone, and Contributing Zone within the Transition Zone and 5 acres within the EARZ, Transition Zone, and Contributing Zone within the Transition Zone measured upstream from the proposed development; 2. The construction of barns or other accessory structures related to agricultural uses. D. Designation required. The water quality zones and buffer zones required by this Ar ticle 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. C. Exceptions. This Ar ticle does not apply to the following:

Division 2: ZONE DESIGNATION

Section 6.2.2.1 Water Quality Zones

A. A water quality zone shall be established for each waterway. Water quality zone have been predetermined by the City for cer tain waterways. A map of such predetermined water quality zones is on file with the City’s Planning and Development Services Depar tment and is available upon request. For

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San Marcos Development Code Amended: November 3, 2021