Option Description
-w n Wait n seconds between retrievals
-nH Don't create a hostname directory
--cut-dirs n Remove n levels of directory from the locally produced directory tree
-r recursive descent
-k convert links to refer to the local copies
-np Don't exit the subdirectory given by the URL

To grab a directory but not drift outside

wget -w <n sec> -nH --cut-dirs <n levels> -r -k -np <URL>