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Home My WebLink AboutFIRE FLOW TESTING - 03-00051 - Teton River Village Building #2 - 3 UnitsSEP 24 2003 1:07PM FORSGREN ASSOCIATES INC R 208 356 0206 FORSG REN ASSOCIATES/ INC. FAX A COMPANY OF ENGINEERS AND SCIENTISTS DATE COMPANY NAME ATTENTION FAX NO. September 24, 2003 City of Rexburg Blair Kay 359-3022 SUBJECT Fire Flow Test for Dl Teton River Village FROM Jeff Lindgren TEL NO. 208-356-9201 FAX NO. 208-356-0206 NUMBER OF PAGES 5 COMMENTS: INCLUDING THIS PAGE IF THERE ARE PROBLEMS WITH THIS TRANSMISSION, PLEASE LET US KNOW AT ONCE. A COMPANY OFENGINEERS AND SCIENTISTS 350 NORTH 2ND EASTIREXBURG, ID 83440/(208) 356-9207 /FAX (209) 356-0206 REXSURG / 80ISE /WYOMING / WENATCHEE / SALT LAKE CITY/ SACRAMENTO /COLORADO WWW.FCRSGREN.COM SEP 24 2003 1:07PM FORSGREN ASSOCIATES INC R 202 35G 0200 p.2 FORSGREN ASSOCIATES INC. September 12, 2003 Mr. Doug Kourth Ellsworth -Paulsen Construction, Inc. 195 East 600 South American Fork, UT 84003 RE: Fire flow re- testing for Teton River Village development in Rexburg Dear Doug: We completed the flow re -testing at the development site this morning. We used the hydrant on the looping line on the north side of the Jack in the Box to measure system static and residual pressures. The hydrant opened for flow metering was at the northwest corner of the site on the main line near O'Dell's Furniture Store. We measured a flow of 2,700 gpm at a residual system pressure of 61 psi. Static pressure before testing was 79 psi. Using a modified Hazen Williams equation calculation recommended by the manufacturer of our flow meter, flow at 20 psi is expected to be 5,130 gpm- Available flow un a water system can vary widely throughout the day and year based on system use. Under the instantaneous flow conditions at the precise time the test was conducted, the 4,500 gpm flow requirement was met. City staff stated that due to the increased population with school in session, the 75 hp booster pump to the north was running at the time of this test. This explains the increased flow as compared to the previous test. I spoke with John Millar, City Engineer about what would happen if there were a major structure fire and the booster pump wasn't running. He said they would manually turn the booster pump(s) on to meet fire flow requirements - If you have any questions, please contact me at (208)-356-9201. Sincerely, 4e# 44V PE S�t��SYF41 � Brent "Husk" Crowther, PE 4 Forsgren Associates, hie. J0763 Enclosure — flow calculations Cc: Blair Kay, Rexburg City 6�:'y::il<titiurt.h-l'aulset�°•.I00) i'ivf,-,40{:oknfn'.M! Corresix)mkrwa ,011 (1icnr,.0u'w40'3 Iii -d' 11',,e Tc� ii doc A COMPANY OF PROFESSIONAL ENGINEERS CENTRAL OFFICE 350 NORTH 2ND EAST /REXBURG, IDAHO 83440 / (208) 356-9201 REXBURG / BOISE / EVANSTON / WEST VELLOWSTONE / SALT LAKE CITY / WENATCHEE SEP 24 2003 1:07PM FORSGREN ASSOCIATES INC R 208 356 0206 P.3 E Alow EE �SSOCEA F ESe INC, OWNER -PROJECT " ✓�aea`"!-- BY DATE PROJECT NO_ CHK'D BY DATE FEATURE �" �j y SHEET OF SEP 24 2003 1:07PM FORSGREN ASSOCIATES INC R 208 356 0206 p.4 FORSGREN ASSOCIATES INC. September 24, 2003 Mr, John R. Watson, Architect JRW & Associates 1 152 Bond Ave. Rexburg, Idaho 83440 RE: Fire flow re -testing for proposed Deseret Industries development in Rexburg Dear John: We completed the requested flow retesting at the proposed site this morning. We again used the hydrant at Horkley's Exxon service station at the northwest comer of 2"d East and 7`E' North to measure system static and residual pressures. The hydrant again opened for flow metering was to the south, near the northeast corner of the proposed development site. This hydrant is also on the west side of 2"d East across from the Sears store. We measured a flow of 2,300 gpm at a residual system pressure of 65 psi. Static pressure before testing was 76 psi. Using a modified Hazen Williams equation calculation recommended by the manufacturer of our flow meter, flow at 20 psi is expected to be 5,540 gpm. Available flow in a water system can vary widely throughout the day and year based on system use. The required flow shown in the code review from Rexburg -Madison County Emergency services is 4,250 gpm. Under the instantaneous flow conditions at the precise time the test was conducted, the 4,250 gpin flow requirement was met. City staff stated that due to the increased population with school in session, the 75 hp booster pump to the north was running at the time of this test. This explains the increased flow as compared to the previous test. I spoke with John Millar, City Engineer about what would happen if there were a major structure fire and the booster pump wasn't running. He said they would manually turn the booster pump(s) on to meet fire flow requirements, As always, if you have any questions, please contact me at (208)-356-9201. Sincerely, ��t�a6►STE (f PE �O B en "Husk" Crowther, PE 03 Forsgren Associates, Inc. �� Enclosure — flow calculations NZ! It Cc: Blair Kay, Rexburg City } lIy Vv`-,Itaxbt�r2 D.1'1100 il�Ti14D CaanrtitiI H Covrnsp�"n ceai,, ;0( (Ak'(W.9,2403 DI llJi w'I-i;&[.doc; A COMPANY OF PROFESSIONAL ENGINEERS CENTRAL OFFICE 350 NORTH 2ND EAST / REXBURG, IDAHO 83440 / (208) 356-9207 REXBURG / BOISE / EVANSTON I WEST YELLOWSTONE / SALT LAKE CITY / WENATCHEE