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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 />2.8.1 Permeability <br />Soil permeability measures the rate of water movement through the soil horizon. This factor is <br />important in managing stormwater quantity and quality. Soils with slow permeability rates are <br />more likely to result in higher stormwater runoff volumes than soils of high permeability. Under <br />these conditions, larger and more extensive stormwater facilities are needed to accommodate <br />new development where space permits. In more densely developed areas, slow permeable soils <br />may be better suited to stormwater conveyance and storage facilities than infiltration facilities. <br />Storage facilities could include detention ponds and treatment ponds where time is desired for <br />settling and filtering purposes. <br />Compared with other Eugene basins, soil permeability in the River Road Santa Clara basin <br />within the UGB is relatively high with 81% being moderately slow and 17% being moderate to <br />very rapid. The following table displays the distribution of soil permeability for the basin. <br />Table 2 -6 <br />Soil Permeability in the River Road Santa Clara Basin <br />Location <br />Permeability <br />(percent) <br />Very <br />Moderately <br />'Moderate <br />Moderately <br />Slow <br />Very <br />No Data* <br />Total <br />Rapid <br />Rapid <br />Slow <br />Slow <br />Within <br />4% <br />3% <br />10 % <br />81% <br />0% <br />1% <br />1% <br />100% <br />UGB <br />Outside <br />8% <br />2% <br />3% <br />74% <br />3% <br />8% <br />2% <br />100% <br />UGB <br />Total <br />7% <br />3% <br />7% <br />78% <br />1% <br />1 3% <br />1% <br />100% <br />Basin <br />*Includes borrow pits and water features such as ponds Source: USDA Soil Survey ofLane County Area, <br />Oregon, 1987. <br />2.8.2 Runoff Potential <br />Soil groups have been rated according to their runoff potential under nonvegetated and saturated <br />conditions without consideration of topographic conditions. Runoff potential measures a soil's <br />capacity to permit infiltration and can be used to describe the degree of runoff expected during <br />storm events. For example, soils rated with a low runoff potential are more likely to have high <br />infiltration rates and, conversely, soils with a high runoff potential are more likely to have low <br />infiltration rates. Hydrologic stormwater models often use this parameter in conjunction with <br />slope and surface cover factors for estimating surface flows under undeveloped conditions. <br />As shown on Map 7, the River Road Santa Clara basin within the UGB contains soil groups with <br />runoff ratings ranging from moderately low (16 %), moderately high (71 %) to "high" (11 %). The <br />following table displays the distribution of potential runoff qualities of the basin: <br />0:\25695978 Eugene RR -SC Final Basin P1an\Master P1anTINAL 2- 2010\Master_Plan 3- 11- 10_FINAL_ Word _Version.doc 11 -26 <br />
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