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Home My WebLink About3067 ! r ORDINANCE N0. 3 0 6 7 AN ORDINANCE OF THE CTTY OF AUBURN, WASHINGTON, ESTABLISHING A SURFACE WRTER RUNOFF POLICY IN THE CITY OF AUBURN AND REQUIRING THE SUBMISSION OF ORAINAGE PLANS IN CONJUNCTION WITN LAND DEVELOPMENT PROPOSALS. THE CITY COUNCIL OF THE CITY OF AUBURN, WASHINGTON, DO ORDAIN AS FOLLOWS : Section 1. PURPOSES. The City Council finds this Ordinance is necessary in order to minimize water quality degredation by preventing the siltation of the City's creeks, streams, rivers, lakes and other water bodies; to protect property owners adjacent to developing land from increased and accelerating runoff rates which would cause erosion or flooding of abutting property; to preserve capacity of existing storm drainage system within developed areas; to promote sound de- velopment policies which respect and preserve the City's water courses; to insure the safety of City roads, street surfaces and rights of way; and to decrease surface water damage to public and private property. Section 2. DEFINITIONS. (a) "Computations" shall mean calculations, including coefficients and other pertinent data, made to determine the drainage plan with rate of flow of water given in cubic feet per second (cfs). (b) "Department" shall mean the Department of Public Works. (c) "Detention" refers to holding runoff for a short period of time and then releasing it to the natural water course where it returns to the hydrologic cycle. (d) "Developmental coverage" shall mean all developed surface areas within the subject property including, but not limited to, rooftops, concrete or asphalt paved driveways, carports, accessory buildings and parking areas. (e) "Director" shall mean the Director Qf the Department of Public Works. Page One Ordinance No. 3067 4-28-76 . r (f) "Drainage area" shall mean the watershed (acreage) contributing surface water runoff to and including the subject property. (g) "Drainage plan" shall mean a plan for receiving, handling and transporting surface water within the subject property. (h) "Peak discharge" shall mean the maximum surface water runoff rate (cfs) determined for the design storm frequency. (i) "Receiving bodies of water" sha11 mean creeks, streams, rivers, lakes, storm sewers and other bodies of water into which surface waters are directed, either naturally or in manmade ditches or open and closed systems. (j) "Retention" refers to schemes whereby water is held for a considerable length of time. The water may never be discharged to a natural water course, but it may be consumed by plants, evapora- tion or infiltration into the ground. (k) "Storm sewer" shall mean a closed system utilized in conveying storm water. (1) "Subject property" shall mean the tract of land which is the subject of the permit and/or approval action. Section 3. SUBMISSION OF A DRAINAGE PLAN. All persons app1ying for any of the following permits and/or approvals shall submit for approval a drainage plan with their application and/or request: (a) Grading Permit (b) Shoreline Substantial Development Permit (both inside and outside Shorelines Boundary) (c) Subdivision Approval (d) Short Plat Approval, except where construction will be residential (e) Rezones (1) If type of development is known or requested by Public Works because of storm drainage deficiencies in the area. Page Two Ordinance No. 3067 4-2$-76 a J • 1 (2) zn the event the type of development is not know at the time of the rezoning, the petitioner shall be advised and furnished a copy of the requirements of the Surface Water Runoff Policy. (f) Special Property Use Permits (g) Conditional Use Permits (if requested by Public Works because of storm drainage deficiencies in the area). (h) Building permits where the permit relates to 5,000 or more square feet of development coverage within the property with or without a surfaced or unsurfaced parking area. (i) Surfaced or unsurfaced parking and outdoor storage areas not in conjunction with building permit for a building or structure. The plan submitted during one permit/approval process may be subsequently submitted with further required applications. The plan shall be supplemented with additional information at the request of the Department of Public Works. The plan requirement established in this Sectian will not apply when the department determines that the proposed permit and/or activity: (a) Wi11 not seriously and adversely impact the water quality conditions of any affected receiving bodies of water, and/or (b) Will not alter the drainage patterns, increase the peak dis- charge and cause any other adverse effects in the drainage area. National Pollutant Discharge Elimination System (NPDES) Regulations as adopted by the City of Auburn shall be utilized in the design of the storm drainage system. Section 4. CONTENTS OF A DRAINAGE PLAN. All persons applying for any of the permits and/or approvals contained in Section 3 of this Ordinance shall provide a drainage plan, stamped by a Registered Professional Engineer, for surface water flows entering, flowing within and leaving the subject property. The detailed form and contents of the drainage plan shall be described in procedures provided by the department. The procedures will set forth the manner of presenting the following required information: Page Three Ordinance No. 3067 4-28-76 ' , . (a) Background computations for sizing drainage facilities: (1) Legal description of the permit area as requested in Section 3 A-J with a contoured topographical map, with acreage indicated and existing storm drainage facilities in the im- mediate vicinity of the improvement. (2) Calculations of the peak discharge and amount of surface water currently entering and leaving the subject property in cubic feet per second. These calculations should consider the entire drainage basin. (3) Calculations of the peak discharge and amount of runoff which will be generated by a 25-year storm within the subject property if development is allowed to proceed. (4) Determination of the peak discharge and amount of water that will be generated by a 25-year storm frequency at various points on the subject property. (b) Proposed improvements for handling the computed runoff, (1) Where open ditch construction is used to handle drainage within the tract, a minimum of 15 feet shall be provided between any structures and the top of the bank of the defined channel. Maximum allowable side slope 2:1. (2) Where a closed system is used to handle drainage within the tract, all structures shall be a minimum of ten (10) feet from the closed system. Section 5. DESIGN CRITERIA FOR ALL DRAINAGE PLANS. (1) Surface water entering the subject property shall be received at the natural1y occurring location and surface water exiting the subject property Page Four Ordinance No. 3067 4-28-76 . shall be discharged at the natural location with adequate entegy dissipators to control erosion and minimize downstream damage and with no diversion at any of these points; and (2) The peak discharge from the subject property may not be in- creased due to the proposed development over the maximum peak discharge rate from any of the preceding 3 years land uses; and (3) Retention/detention facilities must be provided in order to handle all surface water in excess of the peak discharge. Exemptions from any or all of the foregoing requirements may be permitted only after a determination by the department, employing the following criteria: (a) Capacity of downstream facilities; (b) Acceptability of receiving bodies of water; (c) Possibility of adverse effects of retention. Section 6. REVIEW AND APPROVAL OF THE PLAN. All storm drainage plans including calculations prepared in connection with any of the permits and/or approvals listed in Section 3 shall be submitted for review and approval to the Department of Public Works. Section 7. EFFECTIVE DATE. The effective date of this Ordinance shall be five (5) days after its enactment. Further, all plats receiving preliminary approval subsequent to the effective date of this Ordinance must comply with the terms of the Ordinance. In the case of all additional actions enumerated in Section 3, the terms of this Ordinance will apply where final action by the City has not been taken prior to the effective date of the Ordinance. Section 8. SEVERABILITY. If any provision of this Ordinance or its application to any person or property is held invalid the remainder of the Ordinance or the app1ication of the provision to cther persons or circumstances shall not be effected. Section 9. FEE SCHEDULE. First Review 5 acres and under----------------------- $ 50.00 5- 20 acres---------------------------- 10.00 acre Over 20 acre---------------------------- 200.00 minimun and 5.00 acre In excess of 40 acres Page Fiue Ordinance No. 3067 . . m . (Requirements of Sections 4 and 5 must be addressed) Subsequent reviews 1/2 first review (Failure to incorporate City of Auburn review comments will be cause for return to applicant disapproved). Section 10. This Ordinance shall take effect and be in force five (5) days from and after its passage, approval and publication, as provided by law. INTRODUCED: MAY 3, 1976 PASSED: MAY 3, 1976 APPROVED: MAY 3, 1976 ~jET'O[r~ M A Y 0 R ATTEST: City Clerk APOVED AS TO FORM: w ; E 1 " 1 ~ r ~v City Attorney PUBLISHED: MAY 7, 1976 Page Six and last Ordinance No. 3067 4-28-76 q~ e~:~~~~~".~:.`t ~~'.~6Y'Rr.+~dY'+¢=~'►$~i~.`r~~' .s~";f k.' a c i ~ d ,~.ct'~,~ ~s t.,gr . 1 . , u~,~ ,~£i 4`[' yx ~ wfi~ v~e 1"~, ~ u A ~1'~,y S~ . i fa ~ i' ':t + y~; t , Mag 10, 1976 y t. . . m TO: City' L`QUncilmen FFtOM. 5tanley P. Kersey. Mayor ` k . . . . ~r 5UBJECT; ` Qxciinance 3067 - Surface Water Runoff Policy I am herewitl2 returning Ordinance 3067, "Suzface Water Runoff Policy" to you with my veto. The reasans for'rrry ` veto axe as fol2ows: Tha.s Ordinance has been discussed by the St.reet Cqnunittee periodical.ly for appxox.zmately one year. Atna time du.ring this tiine do I have the know.tea"ge that this proposal `has been discussed wa.th persons whv might be affected by its passage.' - This O,rdinance is similar to an Ordinanoe in King Cnunty. Mx: Lea has stated that sma11 changes hatre been made` by the staff and 5'treet Ccarrmeittee: These chanqes should be-Zooked at c.Zosely to deterntine r,. the effect that they mzght lzave upon the, City and/or the DeveZoper and , to ins ure their fairness and 'equ.i ty . I am in support of the concept of th.zs 'ardinance, but helieve that Ordinances sucla as this should be circulhted _prioz`` ta' passage, xather than q:uickly advpting and -then considering ammendments. The O.rdinanloe . gives no dixection to the process :in appeal.zrag decisiorzs nor ;capabilities ` of alternative act.ions which may be taken. Efforts shoul8 be maae ta es tabli:nc capabili ties .far sma.Z.Z developments wi thout txeinendous expense for compZicated data to meet neec3s of plans requzred. 4Sta!ey P Kersey, Mayor 'cc« G.Zobe News Radio KA5Y , 5PKljo :