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Home My WebLink AboutSDP201900062 Study 2020-04-29ROUDABUSH, GALE & ASSOC., Inc. A PROFESSIONAL CORPORATION Serving Virginia Since 1956 Available Fire Flow Report Prepared for: Georgetown and Hydraulic Water Distribution System County of Albemarle, Virginia Prepared by: Roudabush, Gale & Associates, Inc. 914 Monticello Rd. Charlottesville, Virginia 22902 Q:\residata\Projects\Civil Projects\2019\19.0125\ENGINEERING\CALCULATIONS-NARRATIVES\FIRE FLOW REPORT\Georgetown and Hydraulic Cover Sheet.docx ROUDABUSH, GALE & ASSOC., Inc. A PROFESSIONAL CORPORATION Serving Virginia Since 1956 Table of Contents subiect l . Introduction 2. Calibration 3. Normal Demands 4. Fire Flow Requirements 5. Findings 6. Conclusions and Recommendations Attachments A. Area Map B. System Map — Predeveloped C. System Map — Post Developed D. ISO-NFF Calculations E. Water Demand F. Junction (Node) Report G. Pipe Report H. Fire Flow Analysis I. Existing Hydrant Tests Q:\residata\Projects\Civil Projects\2019\19.0125\ENGINEERING\CALCULATIONS-NARRATIVES\FIRE FLOW REPORT\Georgetown and Hydraulic Table of Contents.docx ROUDABUSH, GALE & ASSOC., Inc. A PROFESSIONAL CORPORATION Serving Virginia Since 1956 Section 1— Introduction: This project is the development of design requirements of a water distribution network, and all associated appurtenances for a commercial development proposed to be developed at the intersection of Georgetown Rd. and Hydraulic Rd. This study is intended to document the system fire flow requirements and outline an infrastructure that will deliver those requirements. This new system will connect to the adjacent public water system (owned and operated by the County), and consideration must be made accordingly. Section 2 — Calibration: Hydrant flow tests were conducted by County forces near the project connection points (see existing hydrant tests). A water model was developed to replicate the flows documented in that test. The proposed development was not included in the calibration of the theoretical reservoir and theoretical pump. Nodes and pipes that simulate the proposed section were added along with their corresponding demands (see Appendices B and Q. Section 3 — Normal Demands: Residential lots for the project buildout have been totaled (estimated). The peak hour demands were calculated (see Appendix E) by the individual nodes that were impacted within the water model. Projected uses were developed in accordance with values from Table A of 12VAC5-590- 690, which were multiplied by four (4) to arrive at a Peak Hourly Demand factor. Section 4 — Fire Flow Requirements: The Insurance Service Offices has provided a method by which to determine the required fire flow for a building with a given design. This method takes into consideration the material used for the framework of building construction, the occupancy of the building, and exposure/communication potential. Taking these factors into account, a needed fire flow (NFF) was determined to be 2500 GPM, with a 20 psi residual. Calculations for this NFF are provided in Appendix D. (Source: Insurance Service Offices "Needed Fire Flow Method" as presented in AWWA M31) Section 5 — Findings: This system is essentially comprised of an extension of the current pressure zone. Modeling within Bentley Systems' WaterCAD shows that there is a total of 2,989 gpm available at the proposed hydrant location. Q:\residata\Projects\Civil Projects\2019\19.0125\ENGINEERING\CALCULATIONS-NARRATIVES\FIRE FLOW REPORT\Georgetown and Hydraulic Report Body.docx ROUDABUSH, GALE & ASSOC., Inc. A PROFESSIONAL CORPORATION Serving Virginia Since 1956 Section 6 — Conclusions and Recommendations: The conclusion of this study: L All waterlines should be fitted with a normal compliment of bends, isolation valves, automatic air relief valves, and fire hydrant assemblies. II. The system design, inspections, pipe materials, construction, bedding, cover, etc. shall be in accordance with, as well as with specific permission of, the County of Albemarle, and their current specifications and standards. Q:\residata\Projects\Civil Projects\2019\19.0125\ENGINEERING\CALCULATIONS-NARRATIVES\FIRE FLOW REPORT\Georgetown and Hydraulic Report Body.docx Appendix A: Project Area 6� ParcelIO: 060FO-00-OG-00600 Owner: GONZALEZ-ESKEL, ANGELICA —Lt, J Gepr9etoWrr Gr'n "r Q:\residata\Projects\Civil Projects\2019\19.0125\ENGINEERING\CALCULATIONS-NARRATIVES\FIRE FLOW REPORT\Appendix A.docx R-2 Calibration Reservoir ROUDABUSH, GALE & ASSOC., Inc. A PROFE SSIOV AL CORPORATION Serving Virginia Since 1956 PMP-2 Callbratlon Pump nt 10246) Georgetown/Hydraulic Water Model Schematic Pre -Developed No Scale J-1, J-12 ROUDABUSH, GALE & ASSOC., Inc. A PROFESSIONaI CORPORATION Serving Virginia Since 1956 Georgetown/Hydraulic Water Model Schematic Post -Developed NO &MI Calibration Reservoir -2 Calibration Pump 3��ZI20 pro�e�(-c1�,�,!,;` ucw r f U c o (y1 f 4�tof Appendix D-1: ISO Hand Calculations F. Cot)/�, ��1- i;�hsrru��-+o�� isss cA vc / ieu - 676 q + C' "« o 1 + 76 1) _ �rrf Occ upoaoL�1l Fac , 0� Fx�xsu.re �� u�ll�•tu,r1'� c��ion ---( X� ��C-- �' Sld.e � (,k If 0ii `L)CL,iCI',�� iO�e Slcifc 0 �- 6UL1id;nd I S W,14,10 !06 (7 14 a►�o { Ici. l"L6t'd - h�e eAcr- , -� �1� ��;7�.Ii:fce. I'o �:;��Sec� ��! , ii � • 2�1 � 5 Uyd; au li G rid ,� �s 1 S�. Y1 !�Xt CU-C Wc[!' -111,i cc J,); t 0�,Jk Vul =�275o)Co�5�C1,o�� = z.�zu, ;);; , Appendix D-2: Hydraulic Area Q Appendix D-3: Hydraulic Area N LL LL U- U- U- r. Q LL LL LL LLLLLL 0�000 in > Co Co Co Co Co Co N rn rn rn N m N (O N 00 �O N O NO � M T N U (O�N�� i..i CD � Y N N N M m a w w w w w w Z UUU �j UU m 0 0 ii aaa ii as p O U _ rn Co Co Co U v) CO CO -j � Z ��amv ,� N ��amv ,� c9 — Q w Q Q Q w z z Q J > zzzaaa O > zzaaa w LU LU LU w LU LU O OW O VJ rn Q o Uw W Qm w Wu �o -- Q o .— o �o - a IU U Z m m W U LL m W 0 J 1 11 11 'I li pC r d O rn � N w > t � O) %% / \\ 7 a"+ \\ O O \\ / \\\ \ \\ / \\\ /�\ 00 t J J W g � N s= U Appendix E-1: Water Demand Junction Demand Control Center Scenario Summary ID 92 Label Fire Flows Analysis 2 Notes Demand Fire Flow Analysis ID Label Demand (Base) (gpm) Pattern (Demand) Zone 34 1-1 0.00 Fixed <None> 36 1-2 0.00 Fixed <None> 38 1-3 0.00 Fixed <None> 40 1-4 0.00 Fixed <None> 42 1-5 0.00 Fixed <None> 46 1-7 0.00 Fixed <None> 44 1-6 0.00 Fixed <None> 56 1-8 0.00 Fixed <None> 59 1-9 9.72 Fixed <None> 70 1-10 0.00 Fixed <None> 72 1-11 0.00 Fixed <None> 74 1-12 0.00 Fixed <None> 76 1-13 0.00 Fixed <None> 78 1-14 0.00 Fixed <None> Bentley Systems, Inc. Haestad Methods Solution WaterCAD Georgetown Hydraulic 3-19-20.wtg Center [10.02.03.06] 3/19/2020 27 Siemon Company Drive Suite 200 W Page 1 of 1 Watertown, CT 06795 USA +1-203-755-1666 Appendix E-2: Water Demand Report (ERC Calculation) Junction Demand Control Center Scenario Summary ID 92 Label Fire Flows Analysis 2 Notes Demand Fire Flow Analysis ID Label Number of Unit Unit Demand Demands 34 3-1 0.000 SFD - Residence 36 3-2 0.000 SFD - Residence 38 3-3 0.000 SFD - Residence 40 3-4 0.000 SFD - Residence 42 3-5 80.000 SFD - Residence 44 3-6 80.000 SFD - Residence 46 3-7 40.000 SFD - Residence 56 3-8 0.000 SFD - Residence 59 3-9 0.000 SFD - Residence 70 3-10 21.000 SFD - Residence 72 3-11 7.000 SFD - Residence 74 3-12 0.000 SFD - Residence 76 3-13 4.000 SFD - Residence 78 3-14 4.000 1 SFD - Residence Demand (Base) Pattern (Demand) Zone (gpm) 0.00 Fixed <None> 0.00 Fixed <None> 0.00 Fixed <None> 0.00 Fixed <None> 66.64 Fixed <None> 66.64 Fixed <None> 33.32 Fixed <None> 0.00 Fixed <None> 0.00 Fixed <None> 17.49 Fixed <None> 5.83 Fixed <None> 0.00 Fixed <None> 3.33 Fixed <None> 3.33 Fixed <None> Bentley Systems, Inc. Haestad Methods WaterCAD Georgetown Hydraulic 3-19-20.wtg Solution Center [10.02.03.06] 3/20/2020 27 Siemon Company Drive Suite 200 W Page 1 of 1 Watertown, CT 06795 USA +1-203-755-1666 Appendix F: Junction (Node) Report Label Elevation (ft) Zone Demand (gpm) HydraulicPressure Grade (ft) (psi) Is Active? Demand Collection Unit Demand Collection J-1 611.8 <None> 0 788.4 76 TRUE <Collection: 1 item> <Collection: 0 items> J-2 614.2 <None> 0 788.4 75 TRUE <Collection: 1 item> <Collection: 0 items> J-3 612.45 <None> 0 788.4 76 TRUE <Collection: 1 item> <Collection: 0 items> J-4 609.7 <None> 0 788.4 77 TRUE <Collection: 1 item> <Collection: 0 items> J-5 616.75 <None> 0 788.4 74 TRUE <Collection: 1 item> <Collection: 0 items> J-6 623.95 <None> 0 788.4 71 TRUE <Collection: 1 item> <Collection: 0 items> J-7 577.6 <None> 0 788.4 91 TRUE <Collection: 1 item> <Collection: 0 items> J-8 611.89 <None> 0 788.4 76 TRUE <Collection: 1 item> <Collection: 0 items> J-9 568.22 <None> 10 788.4 95 TRUE <Collection: 1 item> <Collection: 0 items> J-10 605.8 <None> 0 788.4 79 TRUE <Collection: 1 item> <Collection: 0 items> J-11 596 <None> 0 788.4 83 TRUE <Collection: 1 item> <Collection: 0 items> J-12 596 <None> 0 788.4 83 TRUE <Collection: 1 item> <Collection: 0 items> J-13 578.2 <None> 0 788.4 91 TRUE <Collection: 1 item> <Collection: 0 items> J-14 532.01 <None> 0 788.4 111 TRUE <Collection: 1 item> <Collection: 0 items> Appendix G-1: Pipe Report ID Label Length (Scaled) (ft) Start Node Stop Node Diameter (in) Material Hazen -Williams C Has Check Valve? 33 P-1 36 R-1 PMP-1 48 Ductile Iron 130 FALSE 35 P-2 41 PMP-1 J-1 48 Ductile Iron 130 FALSE 57 P-3(1) 57 J-1 J-8 12 Ductile Iron 130 FALSE 58 P-3(2) 189 J-8 J-2 12 Ductile Iron 130 FALSE 39 P-4 113 J-2 J-3 12 Ductile Iron 130 FALSE 41 P-5 88 J-3 J-4 12 Ductile Iron 130 FALSE 43 P-6 131 J-4 J-5 8 Ductile Iron 130 FALSE 45 P-7 397 J-5 J-6 8 Ductile Iron 130 FALSE 60 P-8(1) 243 J-9 J-7 8 Ductile Iron 130 FALSE 61 P-8(2) 19 J-3 J-9 8 Ductile Iron 130 FALSE 62 P-11 253 J-1 J-2 12 Ductile Iron 130 FALSE 63 P-12 265 J-7 J-3 8 Ductile Iron 130 FALSE 71 P-13 659 J-4 J-10 12 Ductile Iron 130 FALSE 73 P-14 835 J-10 J-11 12 Ductile Iron 130 FALSE 75 P-15 35 J-11 J-12 12 Ductile Iron 130 FALSE 77 P-16 455 J-12 J-13 8 Ductile Iron 130 FALSE 79 P-17 800 J-13 J-14 8 Ductile Iron 130 FALSE 85 P-18 60 R-2 PMP-2 48 Ductile Iron 150 FALSE 97 P-19 158 PMP-2 J-1 48 Ductile Iron 150 FALSE Appendix G-2: Pipe Report Minor Loss Coefficient (Local) Flow (gpm) Velocity (ft/s) Headloss Gradient (ft/ft) Has User Defined Length? Length (User Defined) (ft) Is Active? 0.6 (N/A) (N/A) (N/A) TRUE 1 FALSE 0.6 (N/A) (N/A) (N/A) TRUE 1 FALSE 0.6 206 0.59 0 FALSE 0 TRUE 0.6 206 0.59 0 FALSE 0 TRUE 0.6 206 0.59 0 FALSE 0 TRUE 0.6 163 0.46 0 FALSE 0 TRUE 0.6 133 0.85 0 FALSE 0 TRUE 0.6 67 0.43 0 FALSE 0 TRUE 0.6 33 0.21 0 FALSE 0 TRUE 0.6 43 0.27 0 FALSE 0 TRUE 0.6 (N/A) (N/A) (N/A) TRUE 246 FALSE 0.6 (N/A) (N/A) (N/A) FALSE 0 FALSE 0 30 0.09 0 FALSE 0 TRUE 0 12 0.04 0 FALSE 0 TRUE 0 7 0.02 0 FALSE 0 TRUE 0 7 0.04 0 FALSE 0 TRUE 0 3 0.02 0 FALSE 0 TRUE 0 206 0.04 0 TRUE 1 TRUE 0 206 0.04 0 TRUE 1 TRUE Appendix H-1: Fire Flow Table Report Label Zone Fire Flow Iterations Satisfies Fire Flow Constraints? Fire Flow (Needed) (gpm) Fire Flow (Available) (gpm) Flow (Total Needed) (gpm) Flow (Total Available) (gpm) J-1 <None> (N/A) FALSE 0 (N/A) (N/A) (N/A) J-2 <None> (N/A) FALSE 0 (N/A) (N/A) (N/A) J-3 <None> (N/A) FALSE 0 (N/A) (N/A) (N/A) J-4 <None> (N/A) FALSE 0 (N/A) (N/A) (N/A) J-5 <None> 6 TRUE 1500 2471 1567 2538 J-6 <None> 3 TRUE 1500 2066 1567 2132 J-7 <None> (N/A) FALSE 0 (N/A) (N/A) (N/A) J-8 <None> 3 TRUE 2500 2989 2500 2989 J-9 <None> (N/A) FALSE 0 (N/A) (N/A) (N/A) J-10 <None> 6 TRUE 1500 2698 1517 2716 J-11 <None> 6 TRUE 1500 2698 1506 2704 J-12 <None> (N/A) FALSE 1500 (N/A) (N/A) (N/A) J-13 <None> 4 TRUE 1500 2444 1503 2447 J-14 <None> 3 TRUE 1500 2265 1503 2269 Appendix H-2: Fire Flow Table Report Pressure (Residual Lower Limit) (psi) Pressure (Calculated Residual) (psi) Pressure (Zone Lower Limit) (psi) Pressure (Calculated Zone Lower Limit) (psi) Junction w/ Minimum Pressure (Zone) Pressure (System Lower Limit) (psi) 20 (N/A) 0 (N/A) (N/A) (N/A) 20 (N/A) 0 (N/A) (N/A) (N/A) 20 (N/A) 0 (N/A) (N/A) (N/A) 20 (N/A) 0 (N/A) (N/A) (N/A) 20 23 20 20 J-6 (N/A) 20 20 20 37 J-5 (N/A) 20 (N/A) 0 (N/A) (N/A) (N/A) 20 20 0 15 J-6 (N/A) 20 (N/A) 0 (N/A) (N/A) (N/A) 20 23 20 20 J-6 (N/A) 20 22 20 20 J-6 (N/A) 20 (N/A) 20 (N/A) (N/A) (N/A) 20 20 20 28 J-6 (N/A) 20 20 20 29 J-13 (N/A) Appendix H-3: Fire Flow Table Report Pressure (Calculated System Lower Limit) (psi) Junction w/ Minimum Pressure (System) Is Fire Flow Run Balanced? Pressure (Calculated Residual @ Total Flow Needed) (psi) (N/A) (N/A) FALSE (N/A) (N/A) (N/A) FALSE (N/A) (N/A) (N/A) FALSE (N/A) (N/A) (N/A) FALSE (N/A) 20 J-6 TRUE 52 37 J-5 TRUE 41 (N/A) (N/A) FALSE (N/A) 15 J-6 TRUE 35 (N/A) (N/A) FALSE (N/A) 20 J-6 TRUE 58 20 J-6 TRUE 61 (N/A) (N/A) FALSE (N/A) 28 J-6 TRUE 61 29 J-13 TRUE 67 Appendix I-1: Existing Hydrant Flow Tests eciym*Weml nes4esnOwPj!N1, OP* for more dr#aits. En301e(:C *m � � Fiotir7eNiam ftmmiB COUMY Hydrant Flow Date of Report Serviceu rit 11T/20la • Test Report Loestlort WesSGate for Barclay Place Oat* #nd Tlma of Tint IV1412013 �,05'60 PM Mnuras of Flow $ ?rpm- Six* I Inchas) Pressure Kyrdram 10146 Static 1Pressurt (pall 75 A411du*l Pntsiura R P{I ) 61 Q?D Looped Q2O Multiple lalinc Hydrants f ON Sin& Fl-Dw CipriA$WT"t*qiL` ftO mW Hydrant rtl 11121 Pitpt Prys#ute AL 0ll) ss Yyllow 1 71 Tmrkow l Flow HydrarFt I12 Pitvt Prespurm 12 (pall (Ir1114w 3 11 TMFivw 2 o� Flow Hydtant 95 Mot Pressur■ n9lp"I Yellow 3 rJ T Fk7w b Total Ertlmated Flow (Fprn} 1036 AWWA = Calcul tkm [Spa) 2168 IND,fur nQZ ltl[dLeS rsY+r! Pr4Wea'Pb"W■NXIERfrimu Its r.+?rr HmW to Wide open wAmllrrarrwryrrnfar.xiMmlftRrm".rrmmILriiwrMtwurdLirt hwmeVvip-4wry A, IW5 Nr r+'r NW"V mPWLd4++Rn+afrr. rr��,r y�wa�dr.fs:�r PI--. Ma r*oy+:. >rr per Existing Hydrant Flow Test I Hydrant Test Report Appendix I-2: Existing Hydrant Flow Tests Existing Hydrant Flow Test 1 Hydrant Test Location Appendix I-3: Existing Hydrant Flow Tests ern AE W Locution: 11,481,829.401 3,912,744.949 Feet W Field Value ModefType K81-A ModWy8ar 1983 Fii ModelSi2e (Inches) 5 1j4" Comments Ar HydVa€Dist 2' 6" FRONT Manufacturer Kennedy Valve 1ti: InspectorNeme <null> W InService Yes InstaliDate <nulf> Yearinstalled 0 Cr GeneraiArea Terrell Pressure Zone Stillhouse W ASSitUD WFH10856 Inc Status Active �A Criticality <nulf? ate Average Hort2ontal Accuracy (m) <null> Pw Hyd IDS56 9tE FlowHydl 1D857 FlowHyd2 <null? !tE FlowHyd3 <null> ier TesLmdy t 8/23/2019 1:47:00 PM j Location Terrell Rd ve StatPres 91 ResidPres 80 qCr i ROU 91 i C Pitot2 <nulf> Pitot3 <null> MinFlow 2 is T@SFFlowl 1333 TestFlow2 0 les TesiFl0w3 0 TotFlow 1333 Estconsump 2666 vte AWWAQ20 3648 Comments <nulf? ESRIGNSS FIXDATETIME <null> A. Identified 1 feature 0857 4P Existing Hydrant Flow Test 2 Hydrant Test Report and Location