I just purchased a transfer pump from wayne pumps. It comes with an low water suction attachment. I have not used the pump yet (arrived yesterday) but with the new attachments that I put on aqueon water changer I will unscrew the gravel vac portion of the vacuum and attach it to the transfer pump and vacuum the bottom while pumping out the water. I don't know if the pump will have enough power to attach a sprinkle but I'm sure you would be able to water garden or plants. Here is a link to the transfer pump and there is a video on the web showing the put used for aquarium water changes.
http://www.farmandfleet.com/products/495819-wayne-transfer-pump.html#.UT0O91cRurA , this pump comes in 12v or 115v. I have not tried the pump yet but I do believe that it will work. I was searching for a way to change water quicker without wasting water and this is what I came up with.
Though this seems to be an expensive alternative I will keep this in mind as well..
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