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HomeMy WebLinkAboutSTORMWATER CALCS - 11-00378 - Birch Legacy ApartmentsASPEN ENGINEERING.INC. 10727 N YELLOWSTONE HWY. IDAHO FALLS,IDAHO 83401 208-542-1911 PROJECT NAME:Birch Legacy Apartments PROJECT #:2011.021 CLIENT:Doug Gibson -DG Architects DATE:12/1/2011 Input Result STORMWATER CALCULATIONS -100 year storm PRE DEVELOP SITE AREA =83385 Square Feet 1.91 Acres C VALUE = COMPOSITE C 5992 Sq.Ft.-Hard Surface 1880 Building 1666 Landscaping 73847 Unimproved C VALUE WEIGHTED C 0.90 5392.8 0.95 1786 0.15 249.9 0.30 22154.1 0.35 Tc =(minutes) i (10)*= i (100)*= Qp10 =C*i10*A Qp100 =Ci*100*A 11.68 tc=c(LnsA-.5)A0.467 2.18 in/hour 3.51 in/hour 1.48 CFS 2.38 CFS L (length)=180 feet S (slope)=0.01 feeUfeet c =0.83 feet,1.44 meters n=0.02 smooth pavements 0.30 Poor grass/bare sod 0.40 Average grass 0.80 Dense grass POST DEVELOP C CHANGES COMPOSITE C 51353 Sq.Ft.Hard Surface 15365 Building 16667 Landscaping C VALUE WEIGHTED C 0.90 46217.7 0.95 14596.75 ·0.15 2500.05 0.76 Tc =(minutes) Qp10 =C*i10*A Qp100 =Ci*100*A 3.76 tc=0.0078(LAO.77/S0.385)length =180 feet slope = 3.17 CFS 5.10 CFS (EQUALS PEAK RUNOFF =REQUIRED FD.CAPACITY) 0.02 feeUfeet FRENCH DRAINS ;tormtech Chamber Rock Dimension Barel!Volume Btm soil perm. 12 6 8 0.100 each inches feet ftImin. 45.9 cubic feet of storage per chamber =12 chambers tota Coarse sand and Gravel+ WEIGHTED DEPTH OF PRECIPITATION OVER ENTIRE SITE 0.28 inches (Volume of runoff w/o percolation) In other words,it can rain 0.28 inches and the french drains will hold the entire runoff volume without any ercolation DISSIPATION CAPACITY (soil perm.X btm.area) 44.79 cf/min Greater than Required -OK cf cf cf cf PROVIDED STORAGE VOLUME Chamber 550.8 Barrel 339.29 Rock 584.00 Total 1474.09 *From IDF Curve generated from NOAA Atlas 2 data and NOAA Spreadsheet +Table 4.1 ''Typical Values of Permeability Coefficients"-Braja M.Das, Intensity-Duration-Frequency -Rexburg,Idaho Intensity (inches per hour)Duration 25102550100 1====================================================================5 1.311.842.18 2.66 3.063.51 10 1.021.431.692.06 2.382.72 15 0.861.211.431.742.01 2.30 30 0.590.840.99 1.211.391.59 1 0.380.530.630.760.88 1.01 2 0.230.310.370.45 0.520.58 3 0.180.230.280.340.390.43 6 0.120.150.180.22 0.250.27 12 0.080.100.110.14 0.160.18 24 0.050.060.070.080.100.11 -•..J::-I/) Q)J::oc: ~ I/)c: Q)- c:0.50 0.00 -;(- -x- 5 10 15 30 1 2 3 6 12 24 Duration in minutes and hours StormYech SC-740 Chamber Designed to meet the most stringent industry performance standards for superior structural integrity while providing designers with a cost-effective method to save valuable land and protect water resources.The StormTech system is designed primarily to be used under parking lots thus maximizing land usage for commercial and municipal applications. ~ ACCEPTS 85.4"(2170 mm)INSTALLED 90.7"(2300 mm) SC-740 Chamber Detention'Retention'Recharge Subsurface Stormwater ManagementSM ~StormTech® I- ~ \W -.'W 'W .W"..W'.-x~·.')f ~') o 0 0 0 r9-' o 0=000 0 0 ~ (H ..X ••.£1.[1.K ..K ...K x._..,11 ~ SC-740 End Cap 11 51.0"(1295 mm)~1 StormTech SC-740 Chamber (not to scale) Nominal Chamber Specifications Size (L x W x H) 85.4"x 51.0"x 30.0" (2170 x 1295 x 762 mm) Chamber Storage 45.9 ft3 (1.30 m3) Minimum Installed Storage* 74.9 ft3 (2.12 m3) Weight 74.0 Ibs (33.6 kg) Shipping 30 chambers/pallet 60 end caps/pallet 12 pallets/truck THIS CROSS SECTION DETAILS THE REQUIREMENTS NECESSARY TO SATISFY THE LOAD FACTORS SPECIFIED IN THE AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS SECTION 12.12 FOR EARTH AND LIVE LOADS USING STORMTECH CHAMBERS Typical Cross Section Detail (not to scale) ~ MADE IN THE USA THE INSTALLED CHAMBER SYSTEM SHALL PROVIDE THE LOAD FACTORS SPECIFIED IN THE AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS SECTION 12.12 FOR EARTH AND LIVE LOADS,WITH CONSIDERATION FOR IMPACT AND MULTIPLE VEHICLIE PRESENCES. 314-2"(19-50 mm)CLEAN,CRUSHED,ANGULAR STON SC-740 CHAMBER ADS 601 GEOTEXTILE OR EQUAL DESIGN ENGINEER IS RESPONSIBLE FOR ENSURING THE REQUIRED BEARING CAPACITY OF SUBGRADE SOILS· CHAMBERS SHALL MEET ASTM F 2418-05 "STANDARD SPECIFICATION FOR POLYPROPYLENE (PP)CORRUGATED WALL STORMWATER COLLECTION CHAMBERS." GRANULAR WELL GRADED SOIUAGGREGATE MIXTURES,<35%FINES.COMPACT IN 6"(150 mm) LIFTS TO 95%STANDARD PROCTOR DENSITY.SEE THE TABLE OF ACCEPTABLE FILL MATERIALS. 51"(1295 mm)MIN.12"MIN.(305 mm)TYP. Note:Add 1.13 cu.ft.(0.032 m3)of storage for each additional inch (25 mm)of stone foundation. SC-740 Cumulative Storage Volumes Per Chamber Assumes 40%Stone Porosity Calculations are Based Upon a 6"(152 mm)Stone Base Under the Chambers. Depth 01 Water CumulativeTotal System inSystem Chamber StorageCumulative Storage Inches(mm) FP (m3)FP (m3) 42(10671 !45.90 (1.300)74.90 (2.121) 41(1041 I 45.90 (1.300)73.772.089) 40(1016 Stone 45.90 (1.300)72.642.057 39(991) Cover 45.90 (1.300)71.522.025) 38(965 +45.90 (1.300) 70.391.993) 37(948 45.90 (1.300)69.261.961 ) 36(914) 45.90 (1.300)68.14 (1.929) 35(889) 45.85 (1.298)66.98 (1.897 34(864 45.69 (1.294)65.751.862) 33 838 45.41 (1.286)64.461.825 32 813 44.81 (1.269)62.971.783 31 787 44.01 (1.246)61.361.737 30 762 43.06 (1.219)59.661.689 29(737 41.98 (1.189)57.891.639 28(711 40.80 1.155)56.051.587 27(686 39.541.120)54.171.534) 26(660 38.181.081)52.231.479) 25(635 36.74 (1.04050.231.422 24(610 35.22 (0.97748.191.365 23(584 33.64 (0.95346.111.306 22(559 31.99 (0.906)44.001.246) 21(533 30.290.858 41.851.185) 20(508 28.540.808 39.671.123) 19(483 26.740.757 37.471.061) 18 457 24.890.705)35.230.997) 17 432 23.00 (0.651)32.960.939 16 406 21.06 0.596)30.680.869 15 381 19.09 0.541)28.360.803 14 356 17.080.484)26.030.737 13 330 15.040.426)23.680.670 12(305 12.97 0.367)21.310.608 11(279 10.870.3091 18.920.535 10(254 8.740.247)16.510.468 9(229) 6.58 0.186)14.090.399 8(203) 4.410.125)11.660.330 7(178) 2.210.063)9.210.264 6(152 i06.760.191 5(127 I05.630.160 4(102 Stone Foundation 04.510.125) 3(76 03.380.095) 2(51) I02.250.064) 1(25) t01.13 (0.032) Amount of Stone Per Chamber STANDARD LIMITED WARRANTY OF STORMTECH LLC ("STORMTECH"):PRODUCTS (A)This Limited Warranty appiies solely to the StormTech chambers and endplales manufactured by StormTeeh and sold to the original purchaser (the "Purchaser").The chambers and endplales are collectively referred to as the "Products." (B)The struelural integrity of the Products.when installed strictly in accordance with StormTech's written Installation instructions at the tIme of installation,are warranted to the Purchaser against defective materials and workmanship for one (1)year from the date at purchase.Should a de- fect appear in the Limited Warranty period,the Purchaser shall provide StormTcch with written notice of the alleged defect at StormTech's corporate headquarters wiltlin ten (10)days of the discovery of the defect.The notice shall describe the aliened defect in reasonable detail. Storrnlech agrees to supply replacements for those Products determined by Sturm lech tu be defective and covered by this Limited Warranty.The supply at replacement products is the sale remedy of the Purchaser for breaches of this Limited Warranty.StormTech's liability specifically excludes the cost of removal and/or installation of the Products. (C)THIS LIMITED WARRANTY IS EXCLUSIVE.THERE ARE NO OTHER WARRANTIES WITH RESPECT TO THE PRODUCTS,INCLUDING NO IMPLIED WARRANTIES OF MERCHANT-ABILITY OR OF FITNESS FOR A PARTICULAR PURPOSE. (0)This Umitcd Warranty only applies to the Products v.A1en the Products arc installcd in a single layer. UNDER NO CIRCUMSTANCES,SHALL THE PRODUCTS BE INSTALLED IN A MULTI-LAYER CONFIGURATION. (E)No representative of StormTech has the authority to change this Limited Warranty in any manner or to extend this Limited Warranty.This Limited Warranty does not apply to any person other than to the Purchaser. (F)Under no circumstances shall StorrnTech be liable to the Purchaser or to any third party for prod- uct liability claims:claims arising from the design.shipment.or installation of the Products,or the cost of other goods or services related to the purchase and installation of the Products.For this Limited Warranty to apply,the Products must be installed in accordance with all site condi- tions required by state and local codes;all other applicable laws;and StormTech's written in- stallation instructions. (0)THE LIMITED WARRANTY DOES NOT EXTEND TO INCIDENTAL,CONSEQUENTIAL,SPE- CIAL OR INDIRECT DAMAGES.STORMTECH SHALL NOT BE LIABLE FOR PENALTIES OR LIQUIDATED DAMAGES,INCLUDING LOSS OF PRODUCTION AND PROFITS;LABOR AND MATERIALS;OVERHEAD COSTS;OR OTHER LOSS OR EXPENSE INCURRED BY THE PURCHASER OR ANY THIRD PARTY.SPECIFICALLY EXCLUDED FROM LIMITED WAR- RANTY COVERAGE ARE DAMAGE TO THE PRODUCTS ARISING FROM ORDINARY WEAR AND TEAR;ALTERATION,ACCIDENT,MISUSE,ABUSE OR NEGLECT;THE PRODUCTS BEING SUBJECTED TO VEHICLE TRAFFIC OR OTHER CONDITIONS WHICH ARE NOT PERMITTED BY STORMTECH'S WRITTEN SPECIFICATIONS OR INSTALLATION INSTRUC- TIONS;FAILURE TO MAINTAIN THE MINIMUM GROUND COVERS SET FORTH IN THE INSTALLATION INSTRUCTIONS;THE PLACEMENT OF IMPROPER MATERIALS INTO THE PRODUCTS;FAILURE OF THE PRODUCTS DUE TO IMPROPER SITING OR IMPROPER SIZING;OR ANY OTHER EVENT NOT CAUSED BY STORMTECH.THIS LIMITED WAR- RANTY REPRESENTS STORMTECH'S SOLE LIABILITY TO THE PURCHASER FOR CLAIMS RELATED TO THE PRODUCTS,WHETHER THE CLAIM IS BASED UPON CON- TRACT,TORT,OR OTHER LEGAL THEORY. Stone Foundation Depth 6"(150 mm)I 12"(305 mm)I 18"(460 mm)StormTech SC-740 5.5 (4.2)I6.2 (4.7)I6.8 (5.2) Stone Foundation Depth ENGLISH TONS (CUBIC YARDS) 6"12"18" StormTech SC-740 3.8 (2.8 yd3)4.6 (3.3 yd3)5.5 (3.9 yd3) METRIC KILOGRAMS (METER') 150 mm305mm460mm StormTech SC-740 3450 (2.1 m3)4170 (2.5 m3)4490 (3.0 m3)- Note:Storage volumes are in cubic feet per chamber.Assumes 40%porosity for the stone plus the chamber volume. Note:Volumes are in cubic yards (cubic meters)per chamber.Assumes 6"(150 mm) of separation between chamber rows and 18"(460 mm)of cover.The volume of excavation will vary as the depth of the cover increases. Note:Assumes 6"(150 mm)of stone above,and between chambers. Volume of Excavation Per Chamber BareChamberand Stone Chamber Stone Foundation Depth Storage in.(mm) IP (m3) 6 (150)12 (305)18 (460) StormTech SC-740 45.9 (1.3)74.9 (2.1)81.7 (2.3)88.4 (2.5) Storage Volume Per Chamber 74.90 (2.121o Printed in U.S.A.©Copyright.All rights reserved.StormTech LLC,2007 20 Beaver Road,Suite 1041 Wethersfield I Connecticut I 06109 860.529.8188 I 888.892.2694 I fax 866.328.8401 I fax 860-529-8040 I www.stormtech.com Printed on recycled paper @ S16-090508