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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 />calculations for this data are available from the City of Eugene.] The majority of this impervious <br />surface area is concentrated between Highway 99 (west) and the east boundary of the basin. Map <br />3 depicts the existing generalized impervious surface area in pink. Due to the map scale and data <br />restrictions, developed lots are shown entirely in pink. These pink areas are a mix of impervious <br />surface and pervious surfaces associated with the land use such as lawns, streetscapes, parking <br />lot planting, and other landscaped areas. <br />Assuming that future growth in the basin will follow conventional stormwater management <br />drainage practices and will develop according to the land use categories depicted on the Eugene - <br />Springfield Metro Plan designations (see Map 2), the amount of impervious acres in the UGB <br />portion of the basin is projected to increase to 3,044 acres, or 50 percent of the basin's UGB area <br />at buildout. [Note: calculations for this data are available from the City of Eugene.] <br />2.3.3.2 Pervious Surfaces <br />Except for the impervious surface areas noted above, the rest of the basin remains in a pervious <br />condition, consisting mostly in the form of prairie wetlands, forest, agriculture and lawns. <br />Overall, pervious area cover is expected to decrease from the current 62.5 percent of the UGB <br />portion of the basin (3,794 acres) to 50 percent (3027 acres) at UGB buildout. For the purposes <br />of this report, pervious surface areas were identified and grouped into Forest Cover, <br />Landscaping, and Other Vegetated Areas (refer to Figure 2 -4) for the following reasons: <br />Forest Cover is highly effective in reducing runoff volumes, and in preventing erosion (e.g., <br />reduces soil impact by slowing down the velocity of precipitation and by intercepting up to <br />35 percent of it before hitting the ground) and stabilizing steep slopes (established root <br />zones). Areas were included in this category if the forested area exceeded one acre in size. <br />One percent of the River Road Santa Clara basin is currently in forest cover and at UGB <br />buildout, forest cover would decrease to 0 percent. <br />Landscapin areas, including lawns, streetscape and parking lot landscaping are associated <br />with site improvements due to urban development. This category was distinguished to <br />highlight both its positive and potential negative impacts on stormwater resources and is <br />included in the area shaded pink on Map 3. Positive impacts include protection of surface <br />soils, filtration of sediments, and some infiltration (although this is reduced from pre - <br />development conditions). The use of chemical fertilizers, pesticides, and herbicides can <br />cause negative impacts to water quality. The amount of landscaped area in the UGB is <br />projected to decrease from the existing 41 percent to 39 percent at UGB buildout. <br />• Other Vegetated Areas are pervious surfaces not in forest cover or landscaping use, such as <br />agricultural fields, pasture, vacant lots, prairie wetlands, and small clusters of trees (less than <br />one acre). Similar to the landscaping category, these areas have both positive and negative <br />impacts on stormwater resources. Agriculture and pasture uses can be significant <br />contributors of pollutants in this category due to the use of chemical fertilizers, pesticides, <br />0:\25695978 Eugene RR -SC Final Basin P1an\Master P1anTINAL 2- 2010\Master_Plan 3- 11- 10_FINAL_ Word _Version.doc 2-12 <br />
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