Agenda Packet 7-17-19 Work Session

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Ordinance Exhibit DOrdinanceExhibitD DOWNTOWN RIVERFRONT LAND USE COMPONENTS CA 19-1,RA 19-1,Z 19-5,WG 19-3,ST 19-3,and SDR 19-2 April 19,2019 1.Discharged into existing stormwater flood control facilities that, considering all developments that have received tentative or final plan approval as of the date the applicant submits a complete application,have the capacity to handle the stormwater runoff;or This standard ensures that stormwater runoff created by proposed development is discharged to existing or proposed stormwater systems with the capacity to serve or that stormwater runoff is retained or detained on site.The stormwater report from KPFF,dated March 2019 (see Exhibit J) estimated the peak stormwater runoff from the development site using the rational method flow calculation.The northern portion of the site is proposed to discharge into the existing 36"piped stormwater flood control facility that outfalls east of the existing EWEB headquarters building.The existing facility currently receives stormwater runoff from impervious surfaces on the site.The southern portion of the site is proposed to discharge into the existing 60"piped millrace stormwater flood control facility that outfalls directly to the east of the site.The existing facility currently receives stormwater runoff from impervious surfaces on the site.The stormwater service basins have been fully developed for a significant period of time.There are no tentative or final subdivision approvals in the vicinity that would contribute additional flows.The stormwater basin master plan did not identify any existing or future capacity deficiencies based upon future buildout of the site.The stormwater conveyance system is designed in accordance with the planned sub basins and points of discharge. The stormwater memo did not identify any existing capacity deficiencies.Therefore,there is adequate capacity to handle stormwater runoff from the site and this criterion has been met. 2.Retained or detained onsite;or The existing stormwater flood control facilities that serve the proposed development currently have the capacity to serve the proposed development as discussed in subsection (1)above.The development is not proposing to retain or detain any stormwater runoff on site.Therefore,this standard is not applicable. 3.Discharged into a new stormwater flood control facility constructed by the applicant. The existing stormwater flood control facilities that currently serve the development site have the capacity to serve the proposed development as discussed in subsection (1)above.The development is not proposing to construct any off-site stormwater flood control facilities.Therefore,this standard is not applicable. (c)For development proposed within the area shown on Map 9.6791(3)(c) Special Stormwater Flood Control Area Map,the post-development peak flow rate shall not exceed the pre-development peak flow rate for the applicable flood control design storm unless the applicant submits documentation from Junction City Water Control District that the proposed flow rate is acceptable. This standard was established to protect the conveyance ditches of the Junction City Water Control District from an increase in stormwater runoff as the result of the development and urbanization of lands with the City of Eugene's UGB.The standard applies to properties shown on EC Map 9.6791(3)(c).The standard requires the application of hydraulic flow control measures to limits the post-development peak flow rates to that of pre-development conditions.The development site is not located on a property identified on EC Map 9.6791(3)(c).Therefore,this criterion does not apply. City of Eugene 75FINALSUBMITTALJuly 17, 2019, Work Session – Item 2