Why Working With Winter's Water?

Today I went back to work for "the man". While working for him, I remembered a winter oh so long ago. It was the storm of 96. I recalled how my siblings and I had to wear helmets when we went outside because my parents were afraid of falling branches. I remember wanting to make a snowman, but only being able to carve shapes out of ice. Why did I remember this? Back to today. While I was pouring some water in the concrete we were mixing, "the man" said it was water from that storm. Why did he have this water? Where had he stored it, and why was it being used to make concrete in 2007? I'll probably never know the answers to those questions, but I will always remember the winter I carved ice in a helmet.