Well, it certainly was nice seeing real rainbows in the Rainbow challenge. The non-rainbows were okay for sure, but every time I came across a real rainbow it was nice. So, awesome for you for getting a capture of a real rainbow.
I think what really hurt the image was the overall grayness. The dirt looks nice, but the sky is just so bland. Like mentioned before, if you had cropped on the top, I feel that this would have been a stronger image. Also, maybe a levels or curves adjustment would have helped.
Coming across this in voting I was just struck by the concept here. Your title was very nice in conveying your message, and the image just brought out some emotion in me. I thought of droughts and people not having enough water, and rainbows and hope. So even though your image is not as strong, technically, as it could be, I applaud it overall.
Nice double rainbow. For me, the red of the dirt is a good strong compliment and enhances the colors of the bottom rainbow. I also like the vertical format.