Agenda - Council - 09/28/1999 - Laserfiche WebLink

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:! storage capacity. The following are the recommended guidelines for determining additional storage: I · American Water Works Association; reservoirs should be of sufficient size to sustain a peak demand (discounting pumping) of more than 6 hours. I ° Minnesota Department of Health; storage should be equivalent to average day demand (it should be noted that their departments emphasis is on residential concerns). '1 ~ · Bonestroo, Rosene, Anderlik & Associates; 27 to 30 percent maximum day demand. I · RLK & Associates (Gary Brown); (1) identify largest 7 to 8 sprinkled buildings (square footage) (2) list fire flow rating in thousand gallons per minute (3) choose fire flow rating 5th from highest, i.e.: 2000 gallons per minute, tower(s) should flow 2000 GPM for 2 hours, 3000 GPM I tower should flow 3000 GPM for 3 hours. I ° The Public Protection Department of ISO Commercial Risk Services, Inc.: has not yet responded with a recommendation. I The least arbitrary in terms of fire protection would seem to be RLK's guideline. Ramsey's current elevated storage is .5 million. The following are the various storage scenarios: I ~19~7 (Actual) [ AWWA Averhge Average IxfN Dept of Health Boonestroo RLK 1999 (est.) AWWA MN Dept. of Heatth Boonestroo RLK Recommended Storage .72+ million .78 million .86 million Pending* .79 millioa~' ¥ i~. :. Recommended Storage 1.03+ million 1.15 million 1.24 million Pending* 1.14 million *Recommended storage amount is pending staff compilation of sprinkled building data. Water Pr0ducti~n The following represents the millions of gallons pumped from 1995 - 2000 (or the estimate). While the overall growth rate may diminish somewhat in 1999 over levels in 1997 and 1998, a 20% increase over the preceding year is used as more homeowners continue to add irrigation systems. The table also shows that 96 irrigation was normal vs. 97 which had below normal demand after the