The account is this.  Elijah, who has just proclaimed that there would be a drought in the land, is sent by God to stay by the brook at Cherith.  Ravens brought him bread and meat in the morning and evening.  Elijah had nothing to do but to drink from the brook and eat the food that God was miraculously providing.  It must have been a pleasant and wonderful time in the life of this servant.  Then the brook dried up.  I imagine the disappointment of Elijah as he walks down to the brook that morning, only to find it dry.  

I suppose that sometimes it's the same for us.  Sometimes the Lord's blessings flow so freely that it seems as though the floodgates of heaven have been opened.  Yet on occasion the brook dries up, and we seem to be left only with disappointment.  Whether our brook of blessing was a happy marriage, believing children, financial prosperity, good health, or whatever else we receive, when it dries up, we take it personally.  We feel that since God was blessing us, and the blessing ceased, that perhaps that God's feeling for us has changed.  I suppose that this is why the scripture tells us that "the brook dried up, because there had been no rain in the land."  It wasn't because that God stopped caring about Elijah, or that He had stopped watching over Elijah, but simply that there was a drought in the land.  And this what brooks do during a drought. 

As a matter of fact, God had a contingency plan.  There was a widow in Zarephath that would now provide for Elijah.  And as we read on we find that this provision is miraculous as well. 

So what's the point.  It seems that even as God is allowing one brook to dry up, He is causing another to flow.  Often when a brook dries up, we focus so intently on the disappointment that we fail to see the other brooks that are flowing into our lives.  We can waste much of our lives trying to pump water into a dry brook, when it would be so much easier and more pleasant to simply move on to one that is flowing.