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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 3 Flood Control Euaination <br />In order to identify flood related problems and opportunities, a flood control evaluation was <br />completed for the drainage system in the River Road Santa Clara basin that is described in <br />Section 2.5 and illustrated on Map 5. A computer model was used to predict capacity <br />deficiencies in the existing storm drainage system. Section 3.1 provides a brief description of the <br />computer model and a summary of the hydrologic and hydraulic model input data. Section 3.2 <br />describes the model validation process, and Section 3.3 provides a description of model results. <br />Section 3.4 provides a general description of the identified flood - related problems. Section 3.5 <br />describes the project alternatives and development standard alternatives that were selected to <br />address the identified flooding problems. <br />3.1 Hydrologic/Hydraulic Model Development <br />To develop a flood control strategy for the River Road Santa Clara basin, a computer model was <br />used to evaluate hydrologic /hydraulic conditions of the public storm drainage system. The storm <br />system was evaluated under both existing and buildout land use conditions. The City of Eugene <br />selected the XP -SWMM model software to conduct these analyses. In general, the evaluation <br />concentrated on the conveyance capacity of the significant components of the public drainage <br />system; typically, all storm sewer pipes with a diameter equal to or greater than 36" and the <br />associated open waterways on the Willamette Overflow (also referred to as the East Santa Clara <br />Waterway), Spring Creek, Flat Creek, and the A -1 Channel. <br />The River Road Santa Clara basin drainage system, including pipes, open channels and drywells, <br />is shown on Figures 3 -2 through 3 -8. Figure 3 -1 provides an index map that illustrates the <br />relative locations of Figures 3 -2 through 3 -8 in the basin. Modeled drainage segments and <br />locations of the proposed capital projects are also illustrated on Figures 3 -2 through 3 -8. <br />The City -wide storm drainage basin planning summary in Volume I contains detailed <br />information regarding the process and sources of information that were used for identifying <br />flooding problems and opportunities. Section 3 of Volume I specifically includes detailed <br />information regarding the following: <br />• Model selection process. <br />• Sources of model input data. <br />• Design storm selection process. <br />• Model calibration (note: while Volume I contains calibration information that was applied <br />City -wide during the development of the 2002 basin plans, a separate model validation was <br />conducted that is specific to the River Road Santa Clara basin and is described in Section 3.2 <br />of this plan). <br />This section of the River Road Santa Clara report provides a summary of the basin specific <br />hydrologic and hydraulic data used in the models. <br />3.1.1 River Road Santa Clara Basin Hydrologic Data <br />The original River Road Santa Clara Study was an initial study towards development of a <br />stormwater basin master plan and was created in 2002. The Study identified a number of <br />0:\25695978 Eugene RR -SC Final Basin P1an\Nlaster P1an\FINAL 2- 2010\Master_Plan 3- 11- 10_FINAL_ Word _Version.doc 3-1 <br />
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