San Marcos Development Code (effective Nov. 3, 2021)

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C H A P T E R

Environmental Regulations

C. Waiver for Property Outside of the District. Proper ties located outside the urban stormwater management district that are significantly constrained may be eligible for waivers from requirements under Section 3.9.1.1(F) and Section 6.1.4.1 with the approval of the Responsible Official and when the standards under Section 6.1.1.2(B) are met.

maintain, repair and repor t on such activities in accordance with the San Marcos MS4 Ordinance, Section 86.531. C. The development applicant shall provide the City a copy of TCEQ’s approval of the Water Pollution Abatement Plan prior to receiving a City development permit. Section 6.1.1.5 Calculation of Impervious Cover A. Submittal of a series of applications prohibited. A person may not submit a series of applications for approval of any type of watershed protection plan for distinct sites on a single tract of proper ty nor divide such land into smaller parcels for the purpose of increasing the impervious cover limit on the proper ty. If the Responsible Official determines that an application involves a violation of this subsection, the Responsible Official will apply the impervious cover limitation for the entire tract of proper ty, including those por tions already developed, to the application. B. Computation of Impervious Cover. The measurement of impervious cover shall be in accordance with Section 3.9.1.3 of this Development Code. Pervious cover credit will not be allowed for pervious pavements on the EARZ. character of the soil should be limited in order to prevent erosion and attenuate the impact of contaminants collected and transpor ted by stormwater. Open surface drainage through grass-lined swales is preferred. Drainage objectives can best be accomplished by leaving por tions of a subdivision in an underdeveloped and natural state and located to receive runoff from the developed areas for purposes of unchannelized overland flow. The use of green streets utilizing drainage BMPs such as bioretention, pervious pavers, and bioswales shall be utilized whenever possible. B. Storm Sewers. Construction of enclosed storm sewers and impervious channel linings are discouraged. If stormwater drainage systems and/or culver ts are used, these systems shall be designed to mitigate their impact on water quality through the use of approved control strategies to control Division 2: SITE PLANNING Section 6.1.2.1 Natural Drainage A. Drainage Patterns. Natural drainage patterns shall be preserved whenever possible, and the loss of the pervious

(Ord. No. 2020-60, 9-1-2020)

Section 6.1.1.3 Stormwater Management Fund

A. The amount of payment into the Stormwater Management Fund is set by Council and is fixed by a resolution adopted by the City Council in included in the City’s Development Fee Schedule. B. Payments collected by the City shall be kept separate from other revenue of the City. Funds can only be used within the same watershed where they were collected and shall be dedicated solely to the purchase of land or construction of the following: 1. Retrofit and regional water quality Best Management Practices; C. Any development required to implement the stormwater fee or approved alternatives shall run with the land and any subsequent modification of the parcel that requires more site or building area shall require subsequent action to satisfy the stormwater management fee requirement. Section 6.1.1.4 Compliance with City and TCEQ Rules A. All temporary and permanent Best Management Practices (BMPs) required in the approved watershed protection plan must be constructed, operated and maintained in accordance with the standards, criteria and requirements in the Section 86.531 of the San Marcos MS4 Ordinance found in Chapter 86, Ar ticle 8, Division 2 of the San Marcos City Code, the City’s Stormwater Technical Manual, TCEQ Edwards Aquifer Protection Program rules and the TCEQ Technical Guidance on Best Management Practices, RG 348. B. Proper ty owners responsible for maintenance of permanent BMPs, as determined in accordance with Section 3.9.1.7, shall 2. Regional detention and floodplain storage; or 3. Projects to increase flow conveyance.

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San Marcos Development Code Amended: November 3, 2021