if youre doing a full boil you don't really need to worry about hop absorption, however if you need to top it off you might as well 'sparge' them with chilled preboiled water. if your not doing a fulll boil, and have to add water anyways, you should 'sparge' the hops in a strainer, it won't dilute the wort because your adding water already, just gets more hoppy goodness out of it. i place a strainer over my fermenter and collect the hops in there, then rinse them. i usually give it a slight squeeze, and i don't think it does anything to harm it. i don't know of anything in the hops you don't want in there ya know. i even do this when using pellets, whatever gets collected in the strainer gets 'sparged'.