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HomeMy WebLinkAboutORD 84-16 - Storm Water DrainageORDINANCE 84-16., �. Z.Z'-5 AN ORDINANCE ADOPTING A STORM WATER DRAINAGE POLICY; SHOWING APPLICABLE TO THE CITY OF GEORGETOWN AND TO ALL OTHERS WITHIN irs UTILITY SERVICE AREA, PROVIDING FOR REJIE4 OF PLANS, AND PROVIDING AND CONTAINING SEVERABILITY CLAUSE, AND DECLARING AN EMERGENCY BE Ir ORDAINED by the City Council, City of Georgetown, Texas that the City of Georgetown hereby adopts.and establishes the policies for storm water drainage planning and management as follows; I. GENERAL POLICIES Storm drainage facilities should be designed in compliance with the provisions of the drainage criteria manual of the City of Austin, Section 2 through 9 and errata sheets dated July 21, 1977 and as amended from time to time. In case of conflict between City of Georgetown Ordinances and manual content, City of Georgetown Ordinances shall prevail. II. DRAINAGE AND STORM SEWERS Adeluate drainage shall be provided within the limits of the property. The protection of adjoining property from any increase in runoff is mandatory. However City may allow a variance for runoff which does not exceed 108 of the existing condition Up to a maximum of five (5) cubic feet per second if so doing will not adversely affect adjoining property. The City reserves the right to eliminate the detention requirement for properties adjacent to major rivers when in the judgement of the City Engineer such elimination would result in a decrease in the peak flood flow . Drainage and storm sewer plans shall be certified by a Registered Professional Engineer and approved by the City Engineer. Review and approval shall in no manner make the City liable for defects in such plans. City of Austin Drainage Criteria Manual will be used for all calculations relative to rainfall runoff quantities, and the design of channels, culverts, storm sewers and detention facilities. The owners of the tracts upon which are located such easements, appurtenances, and detention facilities shall maintain same and be responsible for their upkeep. Notice of such duty to maintain shall be shown on the plats. Construction plans for streets and utility instalation re wired by the City shall include drainage and storm sewer plans prepared by a Registered Professional Engineer which shall be reviewed and approved by the City Engineer and Director of Public Works prior to such construction. City shall make such inspections as are deemed necessary to assure proper installation. Neither the review nor approval of such plans nor the inspection of the completed work will create any liability on the part of the City. IV. Plans for proposed drainage facilities shall be submitted to the City Engineer for acceptance prior to construction. Further, computations for all drainage related design shall be submitted with the plans for review. Data submitted shall include a drainage area map, a summary of methodology employed and resulting data, land use and runoff coefficient assumptions and other pertinent hydrologic and hydraulic data. Certification shall be submitted by the design engineer that the plans and computations are in compliance with the requirements of this policy and the Drainage Criteria Manual, referred to above. Following construction, but prior to acceptance of improvements by the City, the design engineer shall furnish certification that based upon his periodic inspection of the work all improvements, including those covered by this Ordinance, have been constructed in compliance wiht the City's requirements. V. Plans submitted for utility permits other than for those projects already in compliance with this Ordinance shall include a sit•i dr11n-ige lel -in sha w ins thi, necessary drai-naj- r-elate d e;,7 -A facilities designed and provided for in compliance with this policy and the City of Austin Drainage Criteria Manual. Such plans and design calculations for all drainage. facilities shall be submitted to the City Engineer for acceptance prior to issuance of the utility permit. The design engineer shall certify that the plans and calculations for all drainage facilities are in compliance with the policies and criteria of the City of Georgetown. VI. Nothing herein shall be deemed to in any affect the application of the City of Georgetown Subdivision Ordinance in general and Section 507, Subsection 3, titled "Drainage and Storm Sewers." As sane is intended to remain in full force and effect. VII. The standards set forth herein are not intended to be exhaustive and whenever the City Engineer deems it necessary to make additional requirements in order to maximize the effectiveness of the drainage plan in question such. requirements may be made. Likewise, the City Engineer may allow variances or exceptions to such requirements when so doing will not result in drainage or flooding problems sought to be prevented by this Ordinance. Substantial variances or exceptions must be brought to the attention of the City Council and.approved by it at the time of plan approval. The purpose of those provisions is to enable the City Engineer to make such allitional requirements or exceptions in unique or unusual circumstances. VII. Saving clause if any section, subsection, sentence, clause or phrase of this Ordinance is for any reason held to be unconstitutional, void or invalid, the validity of the remaining portions of this Ordinance shall not be affected thereby it being the intent of the City Council in adopting this Ordinance that no portiui thjreof or prevision or reg-ilatiun contained herein shall v become inoperative or fail by reasons of the unconstitutionality or invalidity of any section, subsection, sentence, clause, phrase, or provision of this Ordinance. By motion duly made, same do then pass with the affirmative vote of all the Council Members present. PASSED on this the 13 day'of March 1984 on first reading as an emergency matter. The nature of the emergency is that the passage of this ordinance is necessary in order to better enable said City to regulate construction so as to avoid, flooding, drainage and related problems. Attest: PAT CA LFRO, CITY SECRE'T'ARY JOHJ C. DOERFLE , MAYOR