Update index.html

index.html

@@ -23,6 +23,7 @@
           <!-- put class="selected" in the li tag for the selected page - to highlight which page you're on -->
           <li class="selected"><a href="index.html">Home</a></li>
           <li><a href="Biomass.html">Biomass Simulator</a></li>
+          <li><a href="Water.html">Urban Water</a></li>
           <li><a href="FWEADE.html">FWE ADE</a></li>
           <li><a href="Visualization.html">Visualization</a></li>
           <li><a href="contact.html">Contact Us</a></li>