Res 2021-246 approving a Development Agreement with HK Baugh Ranch, LLC, HK Riley’s Pointe, LLC, and Benchmark Acquisitions, LLC, to regulate the annexation and future development of approximately 1,142 acres of land

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x - - - _ - SUBDIVISIONS Section 3.9.1.3impervious Cover Calculation and C. At the discretion of the Responsible Official,the owner of the Limitations property to be developed shall dedicate drainage improvements Paved roads, sidewalks, parking areas, parking lots, buildings to the public in a right-of-way rather than a drainage easement. and other impermeable construction covering the natural land D. In determining whether drainage improvements should be surface shall be considered impervious cover.The methods to be dedicated to the public,the Responsible Official shall take the used to calculate the percent of impervious cover created by the following factors into consideration: development of a parcel or tract of land are described in the City Stormwater Technical Manual. Note that the area of impervious 1• Drainage improvements associated with a single cover for a surface may be reduced based on data acceptable to development shall remain private;and the Responsible Official showing that the surface has a significant 2. Drainage improvements that serve streets or other public degree of permeability. property or may serve multiple developments or provide Section 3.9.1.4Erosion Prevention and Highly Erodible regional detention/treatment shall be dedicated to the Soils. public. Erosion prevention and restoration measures detailed in the City E. Drainage easement and right-of-way widths shall be specified Stormwater Technical Manual shall be utilized to attain nature by the City as necessary for inspection and maintenance of mimicking drainage objectives. Refer to the Technical Manual for a facilities as well as to accommodate areas anticipated to be list of local soils that have a high potential for erosion based on Soil inundated by stormwater. Conservation Service data. F. Full detention basin design may be deferred until the site Section 3.9.1.5Drainage Requirements During Construction development permit stage if the property owner submits a ,.request for detention deferral" demonstrating an understanding During construction,on-site drainage shall be maintained so that of the implications of such design deferral AND the following water surfaces are not increased upstream or downstream of the notes are placed on the subdivision plat AND supporting site when compared to pre-project conditions unless fully contained documentation is provided. within a drainage easement or designated right-of-way. 1. "Stormwater detention is required for this property.The Section 3.9.1.6Drainage Improvement Responsibility engineer of record for this subdivision plat has estimated that an area of approximately acres and a A. Drainage improvements required by this Article shall be volume of approximately acre feet will be provided at the sole expense of the owner of the property to be required for this use.This is an estimate only and detailed developed, unless otherwise expressly provided to the contrary analysis may reveal different requirements." in a subdivision improvements agreement. 2. "No building permit shall be issued for this platted B. Drainage easements shall be provided to the public by the property until a Stormwater detention system design has owner of property to be developed for the purposes of been approved by the City of San Marcos or applicable drainage master planning of all drainage improvements, open county if in the ETJ." or enclosed,and all storm water flows to the limits of the one hundred (100)year floodplain as determined in accordance with anticipated fully-developed contributing area land use conditions and allowing continuous access for inspection, operation, maintenance and rehabilitation of all drainage improvements. 3:60 San Marcos Development Code Amended:September 1, 2020