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HomeMy WebLinkAboutPrimary Health Meridian - Hydrological Assessment ReportPrimary Health Meridian City of Meridian, Ada County, Idaho HYDROLOGICAL ASSESSMENT REPORT 1-20-2014 Revised Calculations only Prepared For: Rocky Mountain Development Boise. ID Prepared By: ENGINEERS SURVEYORS PLANNERS 3023 E. Copper Point Dr. #201 Meridian, ID 83642 Scott Sherrow, PE Date: September 10, 2013 Revised - January 20, 2014 Nvld Allllin B NOISN3WIO 3115 s a ZF oxra38tlOv'xria�aaw V Maim H1ltl3H A8tlWlHd m - N T. a ,� LC .� ✓ S � J-"n� � n in lLI 4Y IVnl e? �J _ ___ 1 ----------- _ I Lo CD J 2, O I� cd II m 6 4 CCU)co a Ga vxQ Zto > I - co RR _ _----_i' CL1 __ _ I t 4 it I -------- 565i � J 1 Q Y I I I O c I M S£IoOIIN y} � r, I Lbiu PROJECT t/rTii._ l� r__ _. _._ JOB 7�i1l�C `�i]t7_ _ LL4i�' DATE:—J ENGINEERS SUBJECT, �+ SURVEYORS DESIGNER: _.C?'SHEET: OF:� .1 n I'll, a I �3 Z IY tN li: aeF7- }7 7e I:�5'C-7D h G�P111 7T2r� C- i111�`� T1`i �7bfc E7>= v'r4�RClr}r TO '}ddC-�T" T -#-,E l4�Z ivy T � sf? �S 3©07-H !t« W 05511 •��5-t-(D.©6ty o'Lrgy��tlkS -S it k RA --TQ ; tr 66y c- ! 6 oo e ft�cf-S ��f,�� rain n7 }S3 SAl+I� Corporate Office: 3302 No. Main St.. Spanish Fork, UT 84660 801.798.0555 www.lei-eng.com Salt Lake Office: 14441 Sauth 980 West . Bluffdale, UT 84065 801.495.2844 Boise Office: 2040 S. Eagle Road . Meridian, ID 83642 208.846.9600 Scott Sherrow From: Mike Schreiber <mikes@cmcompany:com? Sent: Friday, January 17, 2014 12:58 PM To: Scott Sherrow Cc: Erin L Hoobing; Matthew Witt Subject: PH Meridian- Seepage bed Scott, The seepage bed was dug at 40' x 15', 6' of rock then 7' of sand below the 6' of rock. Michael Schreiber Protect Superintendent CM Company Inc Cell (208) 724-0402 nij tiC--s@cnI oP..oa.ny. com www.cmcompany.com 8:208-384-0800 R 208-345-5323 Licenses: Idaho Public Works PWC -C-10654 - Unlimited -1,2,3. RCE -1245 Oregon #52774; Washington #600 626 741 �xl�r`ilvl, �an�pi� rv�rs ` UdtvM jz Q e AIW. r o%- �gi� S:1A1�1P T v1qt-v/-1'O `fico J✓��t1rY�i= ICI=C� = � fid`{ — 1'x'61 - �t9'S �F- Ll' eF r-> <!y (25� z5% V -0)P5 F�rcnvlrs -- ern cr vo1... Revised 1/20/2014 Project Primary Health Meridian Basin Data Basin ID Acres C=0.20 C=0.95 C Ave Tc Min in/hr Q25 CFS 1100 yr in/hr Q100 CFS DB1 0.484 0.077 0.407 0.83 10 2.37 0.95 3.11 1.25 DB2 0.169 0.1 0.069 0.51 10 2.37 0.20 3.11 0.27 Rational Method Q = C*1*A C = (Runoff Coefficient for the Rational Method) A = acres (contributing area) I = in/hr (Rainfall Intensity for the Design Storm Duration) Boise Area Intensity -Duration -Frequency Intensity (inches per hour) Design Storm 2 5 10 25 30 50 100 0.17 10 min 1.21 1.67 1.96 2.37 2.44 2.73 3.11 0.25 15 min 1.02 1.41 1.66 2.00 2.06 2.30 2.62 0.33 20 min 0.85 1.17 1.37 1.67 1.72 1.91 2.28 0.42 25 min 0.74 1.01 1.19 1.44 1.48 1.65 2.02 0.50 30 min 0.71 0.98 1.15 1.39 1.43 1.59 1.82 0.58 35 min 0.59 0.81 0.95 1.14 1.18 1.31 1.50 0.67 40 min 0.54 0.74 0.87 1.05 1.08 1.20 1.37 0.75 45 min 0.50 0.68 0.81 0.97 1.00 1.11 1.26 0.83 50 min 0.47 0.64 0.75 0.90 0.93 1.04 1.17 0.92 55 min 0.45 0.62 0.73 0.88 0.90 1.01 1.15 1.00 1 hour 0.45 0.62 0.73 0.88 0.90 1.01 1.15 2.00 2 hours 0.27 0.36 0.42 0.50 0.52 0.58 0.66 3.00 3 hours 0.20 0.27 0.32 0.37 0.38 0.43 0.48 6.00 6 hours 0.13 0.17 0.20 0.23 0.24 0.27 0.30 12.00 12 hours 0.08 0.11 0.13 0.15 0.16 0.18 0.19 24.00 24 hours 0.05 0.07 0.08 0.09 0.10 0.11 0.12 ACRD Calculation Sheet for Finding Peak Discharge/Volume - Rational Method NOTE: This worksheet is intended to be a guideline to standardize ACHD checking of drainage calculations and shall not replace the Engineer's calculation methodology. These calculations shall establish a minimum requirement. The Engineer's methodology must result in facilities that meet or exceed these calculations in order to be accepted. Userimctinvellowcells. To accept default value tvoe =hi vellow cell and paint to computed cell 1 Project Name Primary Health- Meridian Parking&Building 2 Is area drainage basin map provided7 Yea (map must be included with stormwater calculations) 3. Enter Design Storm For Volume (100yearper ACHD policy) 100 4 Enter number of storage facilities (25 max) nick.,, s6nw nn,,,Ps�mHaan. n 5 Area of Drainage Subbasin( SF or Acres) Acres Acre 6 Determine the Weighted Runoff Coefficient (C) C=[(C1xA1)+(C2xA2)+(Cm,An)]/A Weighted Avg Subbasin 3.11 Subbasin Subbasin Subbasin Subbasin Subbasin Subbasin asin Subbbain Sub s 1 Subbasin 2 3 4 5 6 7 8 9 10 0.48 Enter Percentile Storm I(80[h Percentile = 0.34 in) 80th 0.34 in Enter WQ Volume (Vwo= Cxi(from line above) xAx36D0) Vwn 492 ft, 13 Detention: Approved Discharge Rate to Surface Waters (if applicable) cfs 0.48 0.83 0.83 7 Calculate Overland Flowlime of Concentration in Minutes (Tr) or use default User Celmlate A 1D In [10 Min. V 8 Determine the average rainfall intensity (i) from IDF Curve based on i 3.11 mom 9 Cskm late the Post -Project peak discharge(QPeak) 0,-k 1.25 cls lu Calculate peak Qwq(uses 2 y storm) Qwa 0.4 5 (used for S/G Trap throat velocity, WQ storm conveyance system sizing) Playgrounds 0.10-0.35 11 Calculate total runoff vol IV)(for sizing primary storage) V 1,664 it, V = Ci (Tc=60)Ax360D 12 Calculate Vwq (for sizing WQfacilities) Enter Percentile Storm I(80[h Percentile = 0.34 in) 80th 0.34 in Enter WQ Volume (Vwo= Cxi(from line above) xAx36D0) Vwn 492 ft, 13 Detention: Approved Discharge Rate to Surface Waters (if applicable) cfs 14 Volume Summary Surface Storage: Pond WQ Pond. Forebay+l5%sediment V 565 fta Primary Treatment/Storage Basin V 1,173 ft' Subsurface Storage: Seepage Bed Volume Without Sediment Factor V 1,664 ft See HMP04 Seepage Bed for Design Volume With Sediment estimated Runoff Coetrm'ents for Varlaus Surhoo, Type of 5urfare Runoff ccef kkv.oi C. ausiness Crwrtpwn areas 0.70-0.95 Urban neighborhoodareas 050-0.70 Residendal Single-family MuIH-family 0.35-0.50 0.60-0J5 Reeidenaal(ruraq 0.25-040 Apartmmt dwelling areas oJo Industrial and Commercial uehtarea: Heavy areas 0.80 0.90 Parte, cemeteries 0.10-025 Playgrounds 0.10-0.35 Railroad yard areas 0.20-040 Unimproved areas 0.10-0.30 streets 1/20/2014,11:00 AM C\Documents and Settings\Scott\My Documents\Primary Health - Parking & BnlldVWakuHD-9v%phmd6IDCxls 2014-1-20 Revised ACHD Calculation Sheet for Sizing Seepage Bed With Optional Chambers NOTE: This worksheet is Intended lobe a guideline to standardize ACRD checkingaf drainage calculations and shall not replace the Engineer's calculation method a Ii These calculations shal I establish a minimum requirement. The Engineer's methodology must result in facilities that meet or exceed these calculations In order to be accepted. Note this spreadsheet pulls inlarmation from the "Peak 0,V" tab Calculate Post -Project Flows (for pre -project Rows, increase number of storage facilities to create new tab) User Input In yellow cells. To accept default value type = in yellow cell and point to computed call I ProjectName Primary Health - Meridian Parking&Building 2 Enter number of Seepage Beds (25 max) 1 3 Design Storm 100 4 Weighted Runoff Coefficient C 9.83 Link tor 0��`' 5 Act. A(A... s) 0.48 acres Peak O.VTR552 _- 6 Approved discharge are for the given storm (If applicable) 0.90 cfs Y JDesign Vol W/15% Sed for Pem< a 111 V 1,664 it, 0% Sediment for Perc IS in/hr Volume Req. 8 set Total Design Width of All Drain Rock W ls.o it 95et Total Design Depth of All Drain Rock D 60ft Rock Only, Do Not include Filter Sand Depth orCover For additional Volume Store in 10 Vold Ratio of Drain Rock Was 04 Sand Layer. 0.4 for Ls"a" drain rock and 3/4" Chips 11 Design Infiltration Rate B1 in/hr max) Peru 8 In/hr 12 Area InflltraHon Aperc 690 ftz 13 Volume Infiltration Vperc 460 ft'/hr 14 Size of Pelf Pipe Dia pipe 181n 15 Calculate Total Storage per Foot Spf 36:2 ft'/ft Spf=Apf=WxD-Ao, rp.xVoids+l/2 Porf_Area 16 Calculate Design Length L U5e 40' 've IT Override Value Required for Chambers SJ Check Storage for Pea Rate far 24 -Hour Period Storm Duration I 4 Runoff Vol Perc Vol Pre-Pmj Vol Max Vol Regd Min Hr in/hr a, it, it, fts fts 10 0.17 3.13 1.25 749 D 0 749 15 0.25 2.62 1.05 949 0 9 949 30 0.50 1.82 0.73' 1,315 0 0 1,315 60 Loo 1.15 0.46 1,664 D 0 120 2.00 0.66 026 1,899 460 0 1,439 180 3.00 0.48 0:19 2,103 920 0 3,183 360 6,00 0.30 9.12 2,603 2,300 0 393 720 12.00 11.19 0.08 3,326 5,061 D 0 1440 24,00 0.12 9.05 4,049 10,582 0 9 Total Design Vol. 1,664 override 18 Tlmetc Drain 3.3 hours 90% valance in 24 -hours minimum 19 Total Length of Pert Pipe 46 ft NREFI >= 1.2 20 Pert Pipe Check, 4perf, Comak; INCH where DperiCdxAxJ(2xgxH) Optional StorageChambers Note, This assumes chambers are organized in a rectangular layout. 1 Type of Chambers 4-StormTank, 3.0'x1.51x1.5' 2Volume to store V 0 it,3 Installed Chamber Width CW 1.50 ft nstalled Chamber Depth Cd 1.50 ft nstalled Chamber Length Cl 3.00 ft Vold Factor Installed Chember-Sterage Volume 6.75 ft'/ft Total Number of Unite Required 0 as 4 Area of Irritation Aperc ft° s Volume Infiltration Vperc 0 ft'/hr 6 Time to Drain hours 90% volume in 24 -hours minimum 1/20/2014, 11:01 AM C:\Documents and Settings\Scott\My Documents\Primary Health- Parking &Building ACHD � 9;aApi1➢R0II320 Revised ACHD Calculation Sheet for Sand/Grease Traps NOTE: This worksheet is intended to be a guideline to standardize ACHD checking of drainage calculations and shall not replace the Engineer's calculation methodology. These calculations shall establish a minimum requirement. The Engineer's methodology must result in facilities that meet or exceed these calculations in order to be accepted. User input in yellow cells. To accept default value type = in yellow cell and point to computed cel 1 Project Name Primary Health - Meridian Parking & Building linNson IIll llnlaykm[xFY. 1 ence for Throat widths (inch) Baffle Throat Boise Velocity Is the Vault Size Number of Peak Flow Spacing width Area (ftp) 0.5 fps Velocity G S/G Traps Q-cfs inch inch 60.0 max. ok? 1000 G 1 1.25 1 19 48 6.33 0.20 60 ence for Throat widths (inch) 1/20/2014, 11:00 AM C:\Documents and Settings\Scott\My Documents\PrimaryEteeith5...90orik2DE gilding ACHD Method SD Cals 2014-1-20 Revised ADS Boise Lar -ken WQU, Vault BMP 16 G 48.0 50.5 n/a G 60.0 61.5 n/a 1000 n/a n/a 60 1500 n/a n/a 60 1/20/2014, 11:00 AM C:\Documents and Settings\Scott\My Documents\PrimaryEteeith5...90orik2DE gilding ACHD Method SD Cals 2014-1-20 Revised