HomeMy WebLinkAbout1981 01 23 - DER Hydrant Requirementsi'
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3319 MAGUIRE BOULEVARD , 4 ` GOVERNOR
SUITE 232 - �-
a'i 1� i JACOB D. VARN
ORLANDO, FLORIDA 32803 a' (�f/(•, ;_ SECRETARY..
ALEX SENKEVICH
!1*4' OF F`oe��A DISTRICT MANAGER
STATE OF FLORIDA �o0TE
DEPARTMENT OF ENVIRONMENTAL REGULATION ' GAw
ST. JOHNS RIVER DISTRICT
January 23, 19 81
OSJ-81-0232
George Liner, Utilities Director
Indian River County Utilities Department
Post Office Box 1750
Vero Beach, Florida 32960
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Dear Mr. Liner:
Indian River County - MW
Hydrant Requirements
This will serve to confirm receipt of your letter dated January
21, 1981 requesting information as to the criteria that will al-
low hydrants to be installed in any development.
There is one basic requirement which this Department imposes when
determining whether or not hydrants should be included in a par-
ticular public water system. That requirement is that the system
must be designed to maintain a minimum pressure of 20 psi at all
points in the distribution system under -all conditions of flow.
This requirement can be found in two references. The first is
Chapter 17-22 of the Florida Administrative Code, Section 106(3)(f)
which states.... "High service pumping and distribution facilities
shall be designed to provide maximum hourly system demand without
development of distribution pressures lower than 20 psi or other
health hazards." The second is Section 8.1.1 ("Pressure") of the
1976 Edition of Recommended Standards for Water Works, which is
incorporated by reference into Chapter 17--22 F.A.C. under Section
106(4). This -Section (8.1.1) states... "All water mains, including
those not designed to provide fire protection, shall be sized
after a hydraulic analysis based on flow demands and pressure re-
quirements. The system shall be designed to maintain a minimum
pressure of 20 psi at ground level at all points in the distribution
system under all conditions of flow."
CONTINUED . . . .
onlymal t.� lied on 100'1/1- reevvIed paper
Pursuant to the above requirement, we generally utilize two(2)
criteria. These are:
Water Main Design
Section 8.1.2 ("Diameter") of the 1976 Edition of
Recommended Standards for Waterworks states ....
"The minimum size of water main for providing
fire protection and serving fire hydrants shall
be six inch diameter."
Plant Capacity
The water plant should be capable of satisfying
a minimum 500 gpm fire flow demand (residential
situation.) in addition to 1/2 maximum daily system
demand, for a period of 4 hours. This is consistent
with the general fire -fighting requirements of , the
c,y
National Board of Eire Underwriters as referenced in
various sanitary engineering texts, etc. '
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In certain cases we have approved water system designs which depict
hydrant leads but which specify that the hydrants themselves will
not be installed until the plant has the capability to meet the
demand
Our position in all of this has been,to assure that adequate pressure'.
can be maintained in the system under all conditions in order to
protect the public health of the consumers.
We trust that
the above information will be of some assistance to you.
Sincerely,
.i"
WMB f hm
cc: Glenn Dykes,
•�- Neil Nelson
Ed Schmucker
DER - Tallahassee
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"We Me Bostwick, Jr.,P. E.
District Engineer
Water and Wastewater