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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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Template:
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 Surface Water Features and Drainage System <br />This section describes the existing drainage features of the basin including the City's stormwater <br />facilities, open waterways, and wetlands. Refer to Map 5. <br />2.5.1 Waterways <br />Pre - settlement (prior to 1855) morphological conditions in the Willamette Valley reflected a <br />network of shallow, broad swales that would often over -bank during storm events creating <br />ponded conditions. Today, most of the drainages have been altered into narrow, deep and well - <br />defined channels where the management objective of preventing over banking conditions has <br />been accomplished for most small storm events. <br />Five major drainage systems exist in this basin including: the A -1 Channel, Flat Creek, Spring <br />Creek, Highway 99 and the Willamette Overflow (also referred to as the East Santa Clara <br />Waterway). Generally, these open waterways run in a northerly or northwesterly direction. <br />Historically, most of these features meandered along the valley floor before reaching the <br />Willamette River or Long Tom River. Some of these have been altered into narrow, deep and <br />well defined channels designed to collect and convey runoff while others remain relatively <br />undisturbed. <br />2.5.1.1 A -1 Channel <br />The A -1 Channel originates at the junction of Beltline Highway and the Northwest Expressway. <br />It is the largest waterway in this basin flowing northwesterly about three miles through the <br />Highway 99 Industrial Corridor. The channel is surrounded by residential use in the Santa Clara <br />neighborhood changing to adjacent agricultural use as it leaves the UGB. The channel drains <br />into Amazon Creek outside of the Metro Plan boundary. This channel was constructed by the <br />Soil Conservation Service as part of the Lower Amazon and Flat Creek Watershed Improvement <br />Projects primarily for flood control purposes. Vegetation lacks diversity along the channel <br />contributing to poor wildlife habitat. The channel has high enhancement potential however, due <br />to its connectivity with other waterways. The A -1 Channel is listed as a riparian resource site <br />(refer to E60: A -1 Channel) in the adopted 2007 Goal 5 Water Resources Conservation Plan, a <br />refinement plan to the Eugene - Springfield Metro Plan. Protections for two of three identified <br />segments of Site E60 in the form of the Water Resources Conservation Overlay Zone (Eugene <br />Code 9.4910) were adopted by the City of Eugene in November 2005 (effective January 1, 2006) <br />and Lane County in December 2006 (effective January 12, 2007), including setbacks of 20 feet <br />from top of high bank. <br />2.5.1.2 Flat Creek <br />The southern portion of Flat Creek begins near the Northwest Expressway and Park Avenue and <br />flows north towards Beltline Road. With development of Beltline Road and the Northwest <br />Expressway, the natural Flat Creek drainage area south of Beltline Road was diverted into the A- <br />1 Channel, and is no longer hydrologically linked to the northern portion of Flat Creek. The <br />southern portion of Flat Creek includes riparian resource sites E61 (Middle Flat Creek) and E69 <br />0:\25695978 Eugene RR -SC Final Basin P1an\Master P1anTINAL 2- 2010\Master_Plan 3- 11- 10_FINAL_ Word _Version.doc 2-14 <br />
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