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SECTION 5 Stormwater Related Natural Resources For purposes of the basin planning process, the term "natural resources" pertains specifically to the City's open waterways drainage system and the characteristics of it that provide or assist in providing beneficial stormwater functions such as: storm conveyance, flood storage, water quality preservation or treatment, aquatic and riparian habitat, and water temperature controls. These natural resources include the primary waterway corridors of Eugene and adjoining riparian and wetland areas, and headwater streams and wetlands. These characteristics are described in Section 2.0 of this report. Section 5.1 describes the evaluation process used for the other six stormwater basins in Eugene, and partially completed for this River Road Santa Clara basin plan. Section 5.1 also describes the basin - specific problems and opportunities identified under existing and expected future conditions. A description of existing waterway protection measures, other related efforts underway, and gaps in stormwater related natural resources data is also included. Section 5.2 describes the alternatives selected for addressing these problems and opportunities. 5.1 Evaluation of Natural Resources Under Existing and Expected Future Conditions The following provides the objectives, methods, and results of the stormwater related natural resources evaluation for the River Road Santa Clara basin. ectives of the evaluation • Determine the extent of the open waterway drainage system that should be protected for beneficial stormwater functions. • Determine where existing protection policies apply and where gaps exist. • Determine where restoration efforts should be targeted to improve stormwater functions. • Determine where intervention efforts are needed to correct streambank stability problems. • Determine what other efforts are underway which may ultimately provide protection consistent with stormwater program objectives. Methods used to conduct the evaluation Several methods were used to conduct the natural resources evaluation for the River Road Santa Clara basin including the following: The following information was compiled and reviewed to assess the location, condition, and function of the River Road Santa Clara Basin waterway system. Most of the data were contained in the City's geographic information system (GIS): — Open waterway drainage system. — Draft inventory of the Eugene - Springfield Metropolitan Plan Natural Resources Study. — FEMA floodway and floodplain areas. — National wetland inventory. — Soil Survey of Lane County Area, Oregon (1987), Natural Resources Conservation Service. — Historic photos, hydric soils — to help reconstruct the historic drainage system (i.e., pre - settlement). — Areas with stormwater pipe system. 0:\25695978 Eugene RR -SC Final Basin P1an\Master P1anTINAL 2- 2010\Master_Plan 3- 11- 10_FINAL_ Word _Version.doc 5-1