Re: AWWA vs. USD
I looked it up yesterday to answer the same question for myself. Wiki and Google are sure easy tools to use. While reading a related article, I came across a story of a house burning to the ground because the firefighters on scene couldn't find a hydrant with a high enough flow rate to extinguish the hot attic fire that developed. It took them an hour to find a good one, and by then it was too late(that city didn't color-code and the crews didn't have hydrant maps). On a firefighter messageboard, I saw a post about one city using the codes due to fragile water mains. The mains were so old that, if the pumpers were pulling max pressure, the mains would collapse under the stress. The codes in that case warned the crews what rate to set the pumps for.
Originally posted by zooropa
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