Don't be so impatient, I didn't tell you to release the stream against anything, I told you to gather a stream of chakra in your palms. You only need to know the fundamentals of gathering the stream and maintaining it in a specific focal point i.e your hands. Do it again.
To answer your question it depends on the situation;
1) Is the source of the either stream connected to you or your opponent? There are water streaming techniques or continuous flow techniques that do not always originate from the user from their body point (mouth, hands, etc). Same goes for lightning you can create a stream without it being physically connected.
Now, then assuming that both streams are connected it would most likely act against you, the lightning user. Reason is, you're directly connected to the lightning itself as the caster and the jutsu that is a water stream is more than likely a distanced technique that, when launched, is closer to you than your opponent by the time it hits your lightning technique. Lightning, unless it's going to possess a stronger force behind it will not stop water. Water is closer to a solid while lightning is a plasma based element. The mol move more freely so the water could still flow to hit you and since you're connected to the stream you'll get electrocuted because your conductivity is greater.
However some streams of lightning are indeed stronger in force. We see Kakashi having an especially hard time dealing with False Darkness from Kakuzu's mask. A concentrated stream or powerful enough lightning can break through water but again, you're assuming both techniques are of equal rank so it would be sufficient to say that, if your stream isn't an exactly powerful stream in terms of force you couldn't stop the water but you could conduct it.
If both techniques are fired close to one another in terms of time frame and both users are distanced nicely away and both jutsu clash at the middle you could argue either way. One way would be that Lightning hits water and is transfered through the water and therefore back to the source (i.e water user) however it doesn't stop and you will get hit with the jutsu that is now enhanced by your own lightning technique. OR you could argue that the progression of the water technique would stop and your lightning would conduct the water and back to the user but that would assume that lightning > water when they're neutral elements.
Again the end result is a matter of the specific type of jutsu that is being preformed. Lightning streams tend not to be inherently destructive unless they are higher ranked storms and again if we're talking about an equal ranked water jutsu that is likely to have it's own amount of volume and force it all depends. It also depends on the amount. Something like Lightning Beast Running or Thunderbolt Flash vs. the massive volume of colliding water way may not do much. However Burial Banquet may be more formidable. Also some A-ranked techniques may not be too useful against it either since the area may be considerably smaller. Another big thing to consider with your question is the volume of each technique.
