Ord 1982-018 - Laserfiche WebLink

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(2) Individual Disposal Systems. Unsewered lots overlying the Edwards Aquifer Recharge Zone shall use sewage disposal systems that are installed in accordance with the requirements of the Texas Water Development Board Edwards Rule. E. Street and drainage improvements. Plans for street and drainage improvements located within developments which require compliance with this ordinance shall be designed with runoff computed on the basis of a 25-year frequency rainfall in accordance with the City of Austin Drainage Criteria Manuals of the effective date of this ordinance. F. Impervious cover requirements. No person shall develop land, tracts, parcels or lots requiring compliance with this ordinance for the City of San Marcos, Texas, having a slope of 15% gradient or greater, or having highly erodible soils, as identified in Appendix 3, so as to create impervious cover in excess of 35% on slopes from 15% gradient to 25% gradient, or in excess of 20% on slopes over 25% gradient, except in accordance with Section 5. The maximum impervious cover percentage requirement shall only apply to those areas on a parcel of land that are not covered with impervious cover as of the effective date of this ordinance. The impervious cover requirement will pertain to all area within the development which is shown to be on 15% slope or greater by topographical survey performed by a registered surveyor. Those areas within the development which are not on slopes of 15% or greater will be able to be developed to the maximum allowed under applicable laws. Slope contours will be based on existing topography at the time of the effective date of the ordinance. Section 5. Alternative strategies. Notwithstanding any other requirements of this chapter, the developer or builder on any lot, parcel, development or subdivision that is required to comply with this ordinance may elect to use any alternative strategies that are certified by an engineer and accepted by the Director of Public Works, or his designated representative, as having an impact from the rate of stormwater runoff and erosion less than or equal to that which occurred prior to development. A. An applicant may use alternative control strategies to those required by this chapter upon approval of those strategies by the Director of Public Works, or his designated representative. B. The Director of Public Works, or his designated representative, shall rule on the appropriateness of the alternative control strategies within fifteen (15) working days after the applicant has filed his/her request with the Director of Public Works, or his designated representative, and has submitted all necessary supporting data. 8