<div dir="ltr"><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><br></div></div></div></div></div></div></div></div><div class="gmail_quote"><br><div dir="ltr"><br clear="all"><div><div dir="ltr" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><br></div></div></div></div></div></div></div></div><div class="gmail_quote"><br><div dir="ltr"><br clear="all"><div><div dir="ltr" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><br></div></div></div></div></div></div></div></div><div class="gmail_quote"><br><div dir="ltr"><p style="text-align:center;clear:both"><img src="cid:bcf5feed-05fb-49a1-b569-8fdc3cf3e711" alt="SDSU_CSRC Logo.jpg" style="margin-left:1em;margin-right:1em"></p><p class="MsoNormal" align="center" style="line-height:normal;color:rgba(0,0,0,0.87);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;text-align:center"><span style="color:black"><font face="verdana, sans-serif"><br><br>DATE:</font></span><font face="verdana, sans-serif"><span style="font-size:10pt;color:black"> </span><span style="font-size:13.5pt;color:black"> <br></span><b><font size="4">Friday, October 23, 2020</font></b></font></p><p class="MsoNormal" align="center" style="line-height:normal;color:rgba(0,0,0,0.87);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;text-align:center"><b><span style="font-size:18pt"><font face="verdana, sans-serif"><br></font></span></b></p><p class="MsoNormal" align="center" style="line-height:normal;color:rgba(0,0,0,0.87);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;text-align:center"><font face="verdana, sans-serif"><span style="font-size:10pt;color:black"></span></font></p><p class="MsoNormal" align="center" style="line-height:normal;color:rgba(0,0,0,0.87);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;text-align:center"><span style="color:black"><font face="verdana, sans-serif"><br></font></span></p><div dir="ltr" style="color:rgba(0,0,0,0.87)"><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;font-size:14px;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;text-align:center"><font face="verdana, sans-serif"><span style="font-size:10pt;color:black"></span></font></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;font-size:14px;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;text-align:center"><font face="verdana, sans-serif"><span style="color:black"></span></font></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;font-size:14px;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;text-align:center"><font face="verdana, sans-serif"><span style="color:black">TITLE:</span><span style="font-size:10pt;color:black"><br></span></font></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;font-size:14px;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;text-align:center"><font face="verdana, sans-serif"><span style="font-size:10pt;color:black"></span></font></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;font-size:14px;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;text-align:center"><font size="6" face="verdana, sans-serif"></font></p><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal;font-size:14px;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;text-align:center"><font size="6" face="verdana, sans-serif"><b><span style="background-image:none;background-position:0% 0%;background-repeat:repeat"></span></b></font></p><div style="text-align:center"><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:normal"><span style="color:rgb(0,0,0);text-align:left"><font face="verdana, sans-serif" size="4"><b>Ecohydrologic Recovery and Runoff Prediction After Fire in Southern California</b></font></span><font face="verdana, sans-serif" size="4"><b> </b></font></p></div><div style="font-size:14px;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;text-align:center"><font face="verdana, sans-serif"><font size="6"><b><br></b></font><font size="6"><b></b></font></font><p class="MsoNormal" style="margin-top:1em;margin-bottom:1em;line-height:normal"><b><font face="verdana, sans-serif"><span style="font-size:11pt;color:black"></span></font></b></p><font face="verdana, sans-serif"><font size="6"><b></b></font><font size="6"><b><span style="font-size:12pt"></span></b></font><font size="6"><b></b></font><font size="6"><b><span style="font-size:11pt"></span></b></font></font></div><p class="MsoNormal" align="center" style="margin-top:1em;margin-bottom:1em;line-height:norm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><p class="MsoNormal" style="margin-top:1em;margin-bottom:1em;line-height:normal;font-size:14px;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;text-align:center"><span style="color:black"><font size="2" face="verdana, sans-serif">ABSTRACT:</font></span></p></div><div dir="ltr" style="color:rgba(0,0,0,0.87);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px"><font face="verdana, sans-serif"><br></font></div><div><div></div></div><div dir="ltr" style="color:rgba(0,0,0,0.87)"><font face="verdana, sans-serif" size="4"><span style="color:rgb(34,34,34)"><br></span></font></div><div dir="ltr" style="color:rgba(0,0,0,0.87)"><span style="color:rgb(0,0,0)"><font face="verdana, sans-serif" size="4">Following wildfires, the probability of flooding and debris flows increase, posing risks to human lives, downstream communities, infrastructure, and ecosystems. In southern California (USA), the Rowe, Countryman, and Storey (RCS) 1949 methodology is an empirical method that is used to rapidly estimate post-fire peak streamflows. The accuracy of RCS for 33 watersheds under current conditions is re-evaluated. Pre-fire peak streamflows yielded a bias of 0.162 cms/km2 and -0.792 cms/km2 for the 2- and 10-year recurrence interval events, respectively. Post-fire, RCS underpredicted peak streamflows for 2-, 5-, and 10-year events for most watersheds. It was demonstrated that RCS overgeneralizes watershed processes and does not adequately represent the spatial and temporal variability in systems affected by wildfire and extreme weather events. Machine learning was used to identify critical watershed characteristics to develop a multi-variable model. Numerous parameters including local physiography, land cover, geology, slope, aspect, rainfall intensity, and soil burn severity were incorporated into a random forest algorithm. Important parameters were identified, which guided an analytical solution for calculating post-fire peak streamflows in small catchments in southern California during the first year after fire (R2= 0.82). A case study of the 2018 Holy Fire will highlight the influence of climate and watershed characteristics on post-fire processes. Specifically, Landsat 8 enhanced vegetation index (EVI) and ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS) evapotranspiration (ET) and evaporative stress index (ESI) were used to represent vegetation conditions pre- and post-fire and analyzed for the entire burned area. Results demonstrate a suite of satellite-based vegetation indices that can be used by planners to improve the assessment of hydrologic recovery and predict runoff potential following wildfire.</font></span><font face="verdana, sans-serif" size="4"><span style="color:rgb(34,34,34)"> </span><span style="color:rgb(34,34,34)">  </span></font><span style="font-family:"Times New Roman",serif;color:rgb(34,34,34)"> </span><font face="verdana, sans-serif" size="4"> </font><font face="verdana, sans-serif" size="4"><br></font><font face="verdana, sans-serif"><br></font></div><div dir="ltr" style="color:rgba(0,0,0,0.87);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px"><font size="4" face="verdana, sans-serif"> <br></font></div><div dir="ltr" style="color:rgba(0,0,0,0.87);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px"><font size="4" face="verdana, sans-serif"><br></font><p class="MsoNormal" style="margin:0in 5.2pt 0.0001pt 0in;line-height:13.91px"><font face="verdana, sans-serif"><br></font></p><font size="4" face="verdana, sans-serif"></font></div><font face="verdana, sans-serif" style="font-size:14px"><font size="4"><font color="#000000">Host:</font><font color="rgba(0, 0, 0, 0.870588235294118)"> </font><font color="#000000">Jose Castillo</font></font><br></font><div style="color:rgba(0,0,0,0.87);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px"><font size="4" face="verdana, sans-serif"><br></font></div><div style="color:rgba(0,0,0,0.87);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px"><p class="MsoNormal" style="margin-top:1em;margin-bottom:1em;line-height:normal"><font face="verdana, sans-serif" size="4"><span style="font-weight:bold">Note:</span><span style="font-weight:bold"> </span>Videos of previous colloquium talks<span style="text-align:center"> can be seen on the CSRC website in the colloquium archive section or on the </span><a href="https://www.youtube.com/channel/UCN0ZEztlmyDqG2pm-Rle_Eg/feed" rel="nofollow" style="color:rgb(26,115,232);text-align:center" target="_blank">CSRC YouTube page here</a><span style="text-align:center">.</span></font></p><p class="MsoNormal" style="margin-top:1em;margin-bottom:1em;line-height:normal"><font face="verdana, sans-serif" size="4"><span style="text-align:center"><br><br></span></font></p><p class="MsoNormal" style="margin-top:1em;margin-bottom:1em;line-height:normal"><font face="verdana, sans-serif" size="4"><span style="text-align:center"><br></span></font></p></div></div>

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