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SECTION 3 <br />Flood Control Eualnation <br />Therefore, the following model adjustments were recommended that are shown as shaded in <br />Table 3 -4. <br />Table 3 -4 <br />Model Adjustments and Associated Model Results for Node 74406 <br />* For Average Connected Impervious Areas: Effective imp. % = 0.1 * (Mapped Imp. %) (equation # I - Appendix C) <br />** For Low Connected Impervious Areas: Effective imp.% = 0.04 * (Mapped Imp. %) (equation # 4 - Appendix C) <br />0:\25695978 Eugene RR -SC Final Basin P1an\Master P1anTINAL 2- 2010\Master_Plan 3- 11- 10_FINAL_ Word _Version.doc 3-8 <br />Storm <br />Observed <br />Simulated <br />Alternative Model Adjustments <br />Difference (ft) <br />Event Date <br />Freeboard (ft) <br />Freeboard (ft) <br />No initial Changes <br />12/28/2005 <br />5.00 <br />3.20 <br />1.80 <br />1 <br />No initial Changes <br />12/30/2005 <br />9.00 <br />4.47 <br />4.53 <br />No initial Changes <br />12/31/2005 <br />6.00 <br />3.03 <br />2.97 <br />I mp. % Reduced using Average Formula* <br />12/28/2005 <br />5.00 <br />3.57 <br />1.43 <br />2 <br />mp. '/o educed using Average Formula* <br />12/30/2005 <br />9.00 <br />5.75 <br />3.25 <br />mp. % Reduced using Average Formula* <br />12/31/2005 <br />6.00 <br />3.11 <br />2.89 <br />I mp. % Reduced using Low Formula* * <br />12/28/2005 <br />5.00 <br />4.20 <br />0.80 <br />3 <br />Imp. % Reduced using Low Formula* * <br />12/30/2005 <br />9.00 <br />6.17 <br />2.83 <br />I mp. % Reduced using Low Formula* * <br />12/31/2005 <br />6.00 <br />3.17 <br />2.83 <br />Saturated Hydraulic Conductivity Increase by <br />12/28/2005 <br />5.00 <br />3.20 <br />1.80 <br />0% <br />Saturated Hydraulic Conductivity Increase by <br />4 <br />12/30/2005 <br />9.00 <br />4.47 <br />4.53 <br />Saturated Hydraulic Conductivity Increase by <br />12/31/2005 <br />6.00 <br />3.03 <br />2.97 <br />0% <br />Basin width decrease by 50% <br />12/28/2005 <br />5.00 <br />3.20 <br />1.80 <br />5 <br />Basin width decrease by 50% <br />12/30/2005 <br />9.00 <br />4.47 <br />4.53 <br />Basin width decrease by 50% <br />12/31/2005 <br />6.00 <br />3.03 <br />2.97 <br />Model includes only non Drywell areas <br />12/28/2005 <br />5.00 <br />3.20 <br />1.80 <br />Model includes only non Drywell areas <br />6 <br />12/30/2005 <br />9.00 <br />4.47 <br />4.53 <br />Model includes only non Drywell areas <br />12/31/2005 <br />6.00 <br />3.06 <br />2.94 <br />Model includes only non Drywell areas with <br />I mp. Reduced by Average Formula* <br />12/28/2005 <br />5.00 <br />3.57 <br />1.43 <br />Model includes only non Drywell areas with <br />7 <br />I mp. Reduced by Average Formula* <br />12/30/2005 <br />9.00 <br />5.75 <br />3.25 <br />Model includes only non Drywell areas with <br />,Imp. Reduced by Average Formula* <br />12/31/2005 <br />6.00 <br />3.14 <br />2.86 <br />Model includes only non - Drywell areas with <br />I mp. Reduced by Low Formula ** <br />12/28/2005 <br />5.00 <br />4.20 <br />0.80 <br />Model includes only non - Drywell areas with <br />8 <br />I mp. Reduced by Low Formula ** <br />12/30/2005 <br />9.00 <br />6.17 <br />2.83 <br />Model includes only non - Drywell areas with <br />mp. Reduced by Low Formula ** <br />12/31/2005 <br />6.00 <br />3.17 <br />2.83 <br />* For Average Connected Impervious Areas: Effective imp. % = 0.1 * (Mapped Imp. %) (equation # I - Appendix C) <br />** For Low Connected Impervious Areas: Effective imp.% = 0.04 * (Mapped Imp. %) (equation # 4 - Appendix C) <br />0:\25695978 Eugene RR -SC Final Basin P1an\Master P1anTINAL 2- 2010\Master_Plan 3- 11- 10_FINAL_ Word _Version.doc 3-8 <br />