Yuba-Feather Supplemental flood control project, Phase IV

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" rowspan="2" width=185 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> <A HREF="index.htm" TARGET="_top" TITLE="David Ford Consulting Engineers"><U><B><IMG SRC="0d058960.png" border=0 width="88" height="150" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></U></A></div> <bR> <div>    <FONT SIZE="1" COLOR="#000000" FACE="Verdana" > </FONT></div> <div> <B> <TABLE BORDER="0" CELLPADDING="4" CELLSPACING="1" WIDTH="156" BORDERCOLORLIGHT="#FFFFFF" BORDERCOLORDARK="#FFFFFF" FRAME="VOID" RULES="NONE" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 27 WIDTH="146"><div> David Ford Consulting Engineers, Inc.</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 27 ><NOBR><div> 2015 J Street, Suite 200</div> <div> Sacramento, CA 95811</div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 27 WIDTH="146"><div> tel: 916.447.8779</div> <div> fax: 916.447.8780</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 27 WIDTH="146"><div> <A HREF="mailto:support@ford-consulting.com" TARGET="_top" TITLE="mailto:support@ford-consulting.com"><U>support@ford-consulting.com</U></A></div> </tD> </tR> </TABLE></B></div> <div>    </div> <bR> <div> <A HREF="index.htm" TARGET="_top" TITLE="David Ford Consulting Engineers"><U>Home</U></A></div> <div> <A HREF="id461.htm" TARGET="_top" TITLE="About us"><U>About us</U></A></div> <div> <A HREF="news.htm" TARGET="_top" TITLE="News"><U>News</U></A></div> <div> <A HREF="hydrologic_engineering.htm" TARGET="_top" TITLE="Hydrologic engineering"><U>Hydrologic engineering</U></A></div> <div> <A HREF="water_resource_planning.htm" TARGET="_top" TITLE="Water resource planning"><U>Water resource planning</U></A></div> <div> <A HREF="flood_economic_and_risk_analyses.htm" TARGET="_top" TITLE="Flood economic and risk analyses"><U>Flood economic/risk analyses</U></A></div> <div> <A HREF="flood_warning.htm" TARGET="_top" TITLE="Flood warning"><U>Flood warning</U></A></div> <div> <A HREF="decision_support_system_development.htm" TARGET="_top" TITLE="Decision support system development"><U>Decision support systems</U></A></div> <bR> </td> <td valign="top" colspan=2 height=40 BGCOLOR="#3366CC" TEXT="#080000" bgproperties="fixed" background="14400980ezthpx.png"> <div> <B>Yuba-Feather Supplemental flood control project, Phase IV</B></div> <div> </div> </td> </tr><tr> <td valign="top" height=440 colspan=2 BGCOLOR="#FFFFFF" TEXT="#080000" bgproperties="fixed" background="06c00962egerdp.png"> <div> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="1" WIDTH="547" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP COLSPAN=3 BGCOLOR=#CC0000 HEIGHT= 16 WIDTH="537"><div> <B>Situation</B></div> </tD> </tR> <tR> <tD VALIGN=TOP COLSPAN=3 HEIGHT= 216 WIDTH="537"><div> In the past half-century, levees on the Yuba and Feather Rivers in Northern California have failed five times. These levee breaks have resulted in the loss of 41 lives and caused significant property damage in the areas adjacent to the confluence of the two rivers. The Three Rivers Levee Improvement Authority (TRLIA), a joint powers agency between Reclamation District 784 and Yuba County, has taken a proactive role in investigating alternative means of providing supplemental flood control in the region. TRLIA has already constructed levee fixes and setbacks along the Yuba River, Bear River, and lower Feather River. Now, TRLIA is evaluating alternatives for enhancing the upper Feather River levee south of Marysville. This evaluation is Phase IV of the overall Yuba-Feather Supplemental Flood Control Project.</div> </tD> </tR> <tR> <tD VALIGN=TOP COLSPAN=3 BGCOLOR=#339933 HEIGHT= 16 WIDTH="537"><div> <B>Action</B></div> </tD> </tR> <tR> <tD VALIGN=TOP COLSPAN=3 HEIGHT= 849 WIDTH="537"><div> TRLIA asked us to evaluate the damage reduction benefits of the proposed Feather River alternatives, using procedures that would be acceptable to the Corps of Engineers and to the California Department of Water Resources (DWR). Our assignment called for us to compute economic benefits for 3 proposed inundation-reduction alternatives and to prepare a technical document describing our methods and summarizing our findings. These alternatives considered levee strengthening and levee setback alternatives.</div> <div> The possibility of multiple locations of inflow to the impact areas provided an additional technical challenge for this work. To account for this, we developed an innovative scheme that computed system-wide EAD based on levee-failure risk along the various damage reaches in the study area.</div> <div> We submitted our analysis for review by DWR staff. We represented TRLIA at various meetings with DWR and California State Reclamation Board staff in which the analysis and conclusions were reviewed and discussed. We responded to all comments on the economic and risk analysis. According to the DWR economists, "Overall the economic analysis is well done, especially the flood damage analysis."</div> <bR> <div> <IMG SRC="219b0040.jpg" border=0 width="432" height="516" ALIGN="BOTTOM" HSPACE="0" VSPACE="10"></div> </tD> </tR> </TABLE></div> <bR> <bR> <bR> <bR> </td> </tr></table></body>