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O-85-2203 - 10/24/1985ORDINANCE NO. 2203 AN ORDINANCE AMENDING CHAPTER 3, SECTION II: STORMWATER DRAINAGE POLICY AND CHAPTER 3, SECTION 9: FLOOD DAMAGE PREVENTION REGULATIONS, CODE OF ORDINANCES, CITY OF ROUND ROCK, TEXAS. BE IT ORDAINED BY THE COUNCIL OF THE CITY OF ROUND ROCK, TEXAS, I. That the Stormwater Drainage Policy, Chapter 3, Section II, A.(4), is hereby amended by substituting for (c) and (d) the following: (c) Certified engineering data and calculations are presented which fully describe, explain and justify recommended alternatives. (d) Requests for participation in Regional Ponding will be accepted if the subject tract meets the following conditions as they apply: (i) The proposed development will not result in additional identifiable adverse flooding of other property. (ii)A comprehensive engineering report is submitted with all participation requests. This report should address the following as they apply. (a) If the property is suspected of being located in an area of the watershed where ponding would have an identifiable adverse effect on downstream or adjacent property, a spatial series of hydrographs must demonstrate that releasing the developed flows without ponding would prove advantageous. (b) If no direct access to a main watercourse is available and the outflows from the property will eventually confluence at a point satisfying 2a above. An analysis of the secondary drainage system must also be submitted. The secondary drainage system is defined as any gutter, storm sewer, minor channel, or other similar intermediate drainage facility. (c) If the subject tract does not satisfy the conditions of 2a, it must have access to a designated regional pond. The engineer must submit a report addressing the conveyance capabilities of the secondary drainage system as mentioned in 2b. If the pond is either under construction or proposed for construction, the City Engineer will make a determination of the applicant's participation ability. The criteria for this participation will be based on existing sensitivity in the watershed, as presented in the engineering application report. If participation is denied due to a lack of available facilities, provisions can be made for temporary ponding within the applicant's tract, with the intention of their removal as soon as regional facitlities are made available. (iii)Participation fees will be based upon proposed land use. The fees are as follows: $800.00/acre Single Family $1,600.00/acre Multi Family $2,400.00/acre Commercial/Industrial (aa) Adjustment to these fees will be allowed at the discretion of the City Engineer, if it is determined that certain impervious coverage restrictions (e.g. special watershed ordinances), reduce the actual land use. However, the minimum fee regardless of any land use restrictions, shall not be less than $800.00/acre. (bb) Upon approval of participation, the full participation fee will be due prior to approval of construction plans for single family projects and upon building permit approval for multi-family/commercial/and industrial projects. Waiver of this requirement for any reason shall not relieve the owner of responsibility under civil law to adjacent and downstream property owners. II. That Chapter 3, Section 9.0 (f), Code of Ordinances, City of Round Rock, Texas is hereby amended to read as follows: (f) All development establishing impervious cover or otherwise modifying an existing site shall incorporate facilities to prevent any increase in the peak rate of runoff from a 25 year frequency storm. Impervious cover is defined as a man made or constructed coverage of the natural ground surface with roofs, parking lots, streets, drives, etc. The City Engineer shall be authorized to waive this requirement under one or more of the following circumstances: (i) Approved off-site storage is provided for the required regulation of peak flows. (ii) Construction of a single or two-family residential structure on any legally platted lot creates no more impervious ground cover than 30% of the gross lot surface area. (iii) Certified engineering data and calculations are presented which fully describe, explain and justify recommended alternatives. (iv) Requests for participation in Regional Ponding will be accepted if the subject tract meets the following conditions as they apply: (aa) The proposed development will not result in additional identifiable adverse flooding of other property. (bb) A comprehensive engineering report is submitted with all participation requests. This report should address the following as they apply: (1) If the property is suspected of being located in an area of the watershed where ponding would have an identifiable adverse effect on downstream or adjacent property, a spatial series of hydrographs must demonstrate that releasing the developed flows without ponding would prove advantageous. (2) If no direct access to a main watercourse is available and the outflows from the property will eventually confluence at a point satisfying 2a above. An analysis of the secondary drainage system must also be submitted. The secondary drainage system is defined as any gutter, storm sewer, minor channel, or other similar intermediate drainage facility. (3) If the subject tract does not satisfy the conditions of 2a, it must have access to a designated regional pond. The engineer must submit a report addressing the conveyance capabilities of the secondary drainage system as mentioned in 2b. If the pond is either under construction or proposed for construction, the City Engineer will make a determination of the applicant's participation ability. The criteria for this participation will be based on existing sensitivity in the watershed, as presented in the engineering application report. If participation is denied due to a lack of available facilities, provisions can be made for temporary ponding within the applicant's tract, with the intention of their removal as soon as regional facilities are made available. (cc) Participation fees will be based upon proposed land use. The fees are as follows: $800.00/acre Single Family $1,600.00/acre Multi Family $2,400.00/acre..Commercial/Industrial 1. Adjustment to these fees will be allowed at the discretion of the City Engineer, if it is determined that certain impervious coverage restrictions (e.g. special watershed ordinances), reduce the actual land use. However, the minimum fee regardless of any land use restrictions, shall not be less than $800.00/acre. S • 2. Upon approval of participation, the full participation fee will be due prior to approval of construction plans for single family projects and upon approval for multi -family/ commercial/and industrial projects. Waiver of this requirement for any reason shall not relieve the owner of responsibility under civil law to adjacent and downstream property owners. III. A. All ordinances, parts of ordinances, or resolutions in conflict herewith are expressly repealed. B. The invalidity of any section or provision of this ordinance shall not invalidate other sections or provisions thereof. READ. and APPROVED on first reading this the day oft`l / '1 1 , 1985. READ, APPROVED and ADOPTED on second reading this the eg9day of , 1985. ATTEST: ,Ykl.) Z4 NE LAND, Ci y Secretary 07-71-11 MIKE ROBINSON, Mayor City of Round Rock, Texas