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Admin Order 58-12-14
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Admin Order 58-12-14
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Last modified
11/7/2012 2:23:00 PM
Creation date
11/7/2012 2:09:00 PM
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City Recorder
CMO_Document_Type
Admin Orders
Document_Date
11/2/2012
Document_Number
58-12-14
Author
CRO
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SECTION 2 Study Area Characteristics <br />2.5.4 Drywell Drainage System <br />Drywells are underground structures that collect stormwater runoff which is then discharged into <br />the ground where it mixes with the groundwater. The River Road Santa Clara stormwater basin <br />is unique compared to other Eugene -area basins in its frequent use of drywells for managing <br />stormwater. Approximately 22% of the River Road Santa Clara stormwater basin currently <br />drains to drywells. This area has historically utilized drywells because it lacks a continuous <br />stormwater system and because the flatness of the topography and the relatively high <br />permeability of the soils are conducive to stormwater management through this method. There <br />are 785 known drywells in the River Road Santa Clara basin. Of those drywells, 634 (81 %) are <br />privately owned, 79 (10 %) are owned by Lane County, and 72 (9 %) are owned by the City of <br />Eugene. Drywells come in numerous configurations which are collectively termed <br />"Underground Injection Controls" or "UICs." <br />2.5.5 Maintaining the Drainage System <br />The Lane County Public Works Department, the Junction City Water Control District, and the <br />City of Eugene share limited maintenance responsibilities in this basin. Lane County Public <br />Works Department is responsible for stormwater facility maintenance in the unincorporated <br />portions of this basin. This maintenance activity is limited to drainage problems that directly <br />affect County right -of -way, such as roadside ditches, culverts, and bridge crossings. The <br />Junction City Water Control District is responsible for maintenance of irrigation ditches, <br />channels and waterways within the District's boundaries, which lie in the unincorporated areas <br />north of Eugene in the Flat Creek, A, A -1 and A -2 Channel watershed boundaries. The City is <br />responsible for maintaining areas that have been annexed to the City. The City and County share <br />maintenance responsibilities in this basin which results in greater efficiencies for both <br />jurisdictions. <br />2.5.6 Floodplain <br />A flood insurance study for the Federal Emergency Management Agency (FEMA) has been <br />conducted within the River Road Santa Clara basin. As part of this study, areas subject to the <br />100 -year flood event have been identified. One thousand two hundred seventy acres of <br />floodplain have been mapped within the basin. There are approximately equal acres of <br />floodplain within and outside the UGB. Most of the broad floodplain area is associated with the <br />Willamette River in the northeast portion of the basin just outside the UGB. Ribbons of <br />floodplain are also located adjacent to the five primary waterways that flow through the basin. <br />(See Map 5) More detailed floodplain studies necessary to map floodway boundaries have not <br />been conducted for this basin. <br />2.6 Water Quality <br />This section provides a description of water quality conditions in the River Road Santa Clara <br />basin. Water quality conditions can vary dramatically depending on time of day, weather <br />conditions, land use activities conducted in the watershed, and location in the water body. <br />Therefore, without significant amounts of data, it is often difficult to adequately evaluate water <br />N:ASTORMWATER \City of EugencARR_SC Stormwater Basin Plan\2012 Document \Master_ Plan _9- 18- 12_DR-AFT Word Version.doc 2 -17 <br />
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