The urlrewrite component's urlrewrite.xml can map the 'tides/nnnnnnn' URL to a pipeline:

<rule>
   <condition type="method">GET</condition>
   <from>^/tides/(.+)</from>
   <to>/request.pd?location=$1</to>
</rule>

And we'll change the web.xml to invoke that component:

<filter>
   <filter-name>UrlRewriteFilter</filter-name>
   <filter-class>org.tuckey.web.filters.urlrewrite.UrlRewriteFilter</filter-class>
   <init-param>
     <param-name>confReloadCheckInterval</param-name>
     <param-value>60</param-value>
   </init-param>
</filter>
    
<filter-mapping>
   <filter-name>UrlRewriteFilter</filter-name>
   <url-pattern>/*</url-pattern>
   <dispatcher>REQUEST</dispatcher>
   <dispatcher>FORWARD</dispatcher>
</filter-mapping>

Keep in mind you need to copy the supporting jar files into 'WEB-INF/lib'.