I too have prayed for rain and tried to cut water usage at my home. As I have done this, I have realized that my prayers for rain can create problems elsewhere.
In a simple example, I had a painting project to do outside to help improve an area of my home. I booked time in my schedule to paint outside on a Saturday, but when that Saturday came, the skies were threatening rain.
I did not have a lot of free time in my schedule, and rain that day could delay the painting until a few weeks later. I found myself offering a silent prayer that it would not rain that day so that I could paint.
As I did that, I realized that I had offered the same prayer earlier too, when I had scheduled an outdoor gathering for my neighborhood. The night it was scheduled for had a storm come in and make everything too cold and windy (the rain came a little later) for people to gather outside. That night I had said a silent prayer that the weather could cooperate for that night.