Strong and Chicken Ranch Sloughs, California feasibility study: Phase I

<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>Strong and Chicken Ranch Sloughs, California feasibility study: Phase I </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= 353 WIDTH="537"><div> <IMG SRC="227b0e90.jpg" border=0 width="432" height="233" ALIGN="RIGHT" HSPACE="10" VSPACE="10">The Strong Ranch Slough and Chicken Ranch Slough (SRS / CRS) drainage basin is an urban watershed of approximately 15 square miles within Sacramento County, in northern California. Floods in 1986, 1995, and 1997 caused significant damage in the watershed. Following studies by Sacramento County, the Corps of Engineers undertook a feasibility study to develop and evaluate potential alternatives to reduce flood damages within the watershed. </div> <div> The Sacramento District Corps of Engineers asked us to help in the development of flood damage reduction alternatives. </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= 311 WIDTH="537"><div> We developed watershed runoff models with HEC-1 and computed design storm runoff, developed a model of the channel network and pump station with computer program UNET, and used coincident frequency analysis to develop stage-frequency functions for damage evaluation in the watershed, accounting for the impact of Lower American River (LAR) stages.</div> <div> With input from the Corps' study team and local sponsors, we identified 16 alternative damage reduction plans, and modeled each to obtain water surface profiles. We then inventoried all floodplain property and established stage-damage functions for the system. Using the Corps' risk and uncertainty analysis procedures, as implemented in computer program HEC-FDA, we computed the expected annual damage for each of the 16 damage reduction plans, which were compared to the no-action alternative. Our analysis also included the use of HEC-1, UNET, ArcView, HEC-FDA, HEC-DSS, and Visual Basic for Applications with Excel. </div> <div> We provided a detailed feasibility report with an evaluation of each of the 16 proposed alternatives. The alternatives evaluated include increasing the size of a detention pond and pumps, constructing floodwalls of various configurations along the channel, providing local protection, upgrading existing flood warning systems, and combinations of these.</div> </tD> </tR> <tR> <tD VALIGN=TOP COLSPAN=3 HEIGHT= 496 ><NOBR><div> <IMG SRC="226b0930.jpg" border=0 width="432" height="147" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <div> <IMG SRC="228b0350.jpg" border=0 width="432" height="309" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> </TABLE></div> <bR> <bR> <bR> <bR> </td> </tr></table></body>