A pool has always been a good way to beat the Arizona heat, with the oldest man-made pools predating the state. Even those who lived in Arizona in the 1800s were smart enough to realize the desert is too hot and its residents were in dire need of some aquatic relief. Although Arizona has plenty of natural water, such as creeks, lakes and waterfalls, many are hidden within the mountains. Early Phoenix residents even swam in the canals before pool…