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Studies APPLICANT 9/25/2020
Goebel Engineering & Surveying, Inc. Engineering Surveying Land Planning Services 23684 Boller Road Elmira, OR 97437 Phone: 541-687-0542 E-mail: goebel@goebelena,com Stormwater Report HIGH BANKS ESTATES Tax Lots 500 & 600 Map 17-02-28-34 Presumptive Approach THROUGH Infiltration Swale EXPIRES: 6/30/2021 Prepared for The City of Springfield July 2020 1P ill01IMUTIa4a STREET + 50% LOT Subcat Reach m Lin k W ENID ROAD INDUSTRIAL WAREHOUSE HIGH BANKS ESTATES-SWALE Prepared by Goebel Engineering & Surveying Printed 7/22/2020 HydroCAD® 10.00-25 s/n 04646 C 2019 HydroCAD Software Solutions LLC Pae 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 1.451 39 >75% Grass cover, Good, HSGA (1 S) 1.814 98 TOTALIMPERVIOUS (1S) W ENID ROAD INDUSTRIAL WAREHOUSE HIGH BANKS ESTATES-SWALE Type lA 24 -hr 5YEAR Rainfall -3.60" Prepared by Goebel Engineering & Surveying Printed 7/22/2020 HydroCAD® 10.00-25 s/n 04646 C 2019 HydroCAD Software Solutions LLC Paee 3 Summary for Subcatchment 1S: STREET +50% LOT Runoff = 1.53 cfs @ 7.88 Ins, Volume= 0.511 at,, Depth= 1.88" Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0.00-48.00 Ins, dt= 0.02 Ins Type IA 24 -hr 5 YEAR Rainfall=3.60" Area(sf) CN Description • 79,036 98 TOTAL IMPERVIOUS 63,203 39 >75% Grass cover, Good, HSGA 142,239 72 Weighted Average 63,203 Tc=5.0 r*ih 44.43% Pervious Area 79,036 0 55.57°/ Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (CIS) 5.0 Direct Entry, MINIMUM TIME Subcatchment 1S: STREET + 50% LOT Hvdronranh Time (hours) ■ a000n 1.53 Cfs Type 1A 24 -hr 5 YEAR Rainfall=3.60" Runoff Area=142,239 sf --Runpff Volume=0.511 of Runoff Depth=1.88" Tc=5.0 r*ih CN=30/98 0 Time (hours) ■ a000n W ENID ROAD INDUSTRIAL WAREHOUSE HIGH BANKS ESTATES-SWALE Type M 24 -hr 5 YEAR Rainfall -3.60" Prepared by Goebel Engineering & Surveying Printed 7/22/2020 HydroCAD® 10.00-25 s/n 04646 C 2019 HydroCAD Software Solutions LLC Paee 4 Summary for Pond 1P: POND-SWALE Inflow Area= 3.265 ac, 55.57°/Impervious, Inflow Depth= 1.88" for 5YEAR event Inflow = 1.53 cfs @ 7.88 Ins, Volume= 0.511 of Outflow = 0.72 cfs @ 8.33 Ins, Volume= 0.511 at,, Atten=53%y Lag= 27.1 min Discarded = 0.72 cfs @ 8.33 Ins, Volume= 0.511 of Routing by Stor-Ind method, Time Span= 0.00-48.00 Ins, dt= 0.02 Ins Peak Elev= 494.22'@ 8.33 Ins Surf.Area= 0.035 are Storage= 0.060 of Plug -Flow detention time= 25.1 min calculated for 0.510 of (100% of inflow) Center -of -Mass det. Lime -25.1 min ( 689.7 - 664.6 ) Volume Invert Avail.Storage Storage Description #1 491.38' 0.109 of 10.00'W x 40.00'Lx 4.00'11 INFILTRATION POND-SWALE Z=3.0 Device Routine Invert Outlet Devices #1 Discarded 491.38' 20.000 in/hr Exflltrafion over Surface area Discarded Outflow Ma 0.72 cfs @ 8.33 In HW -494.22' (Free Discharge) 1=Exflltrafion (Exfiltration Controls 0.72 cfs) Pond 1P: POND-SWALE ■ mnow 1.5s ■Dnsas a In11QW'Arep=3;2Q5'aq Peak 'EI'ev=49'4.22' $torae=0', OGOL a a 0.72 cfs I 24 26 28 36 32 34 36 38 46 42 44 46 48 (nouns) W ENID ROAD INDUSTRIAL WAREHOUSE HIGH BANKS ESTATES-SWALE Type 1A 24 -hr 10 YEAR Rainfall -4.56" Prepared by Goebel Engineering & Surveying Printed 7/22/2020 HydroCAD® 10.00-25 s/n 04646 C 2019 HydroCAD Software Solutions LLC Paee 5 Summary for Subcatchment 1S: STREET +50% LOT Runoff = 1.95 cfs @ 7.99 Ins, Volume= 0.669 at,, Depth= 2.46" Runoff by SBUH method, Split Perviousflmperv., Time Span= 0.00-49.00 Ins, dt= 0.02 Ins Type IA 24 -hr 10 YEAR Rainfall -4.56" Area(sf) CN Description • 79,036 99 TOTAL IMPERVIOUS 63,203 39 >75% Grass cover, Good, HSGA 142,239 72 Weighted Average 63,203 44.43% Pervious Area 79,036 55.57°/ Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (CIS) 5.0 Direct Entry, MINIMUM TIME Subcatchment 1S: STREET + 50% LOT HVdraerwh Type 1A 24 -hr i/ 1 YEAR Rainfall=4.56" Runoff • 1 Runoff Depth=2AV W ENID ROAD INDUSTRIAL WAREHOUSE HIGH BANKS ESTATES-SWALE Type M 24 -hr 10 YEAR Rainfall -4.56" Prepared by Goebel Engineering & Surveying Printed 7/22/2020 HydroCAD® 10.00-25 s/n 04646 C 2019 HydroCAD Software Solutions LLC Paee 6 Summary for Pond 1P: POND-SWALE Inflow Area= 3.265 ac, 55.57°/Impervious, Inflow Depth= 2.46" for 10 YEAR event Inflow = 1.95 cfs @ 7.99 Ins, Volume= 0.669 of Outflow = 0.97 cfs @ 9.36 Ins, Volume= 0.669 at,, Atten=55%y Lag= 29.0 min Discarded = 0.97 cfs @ 9.36 Ins, Volume= 0.669 of Routing by Stor-Ind method, Time Span= 0.00-49.00 Ins, dt= 0.02 Ins Peak Elev— 494.96'@ 9.36 Ins Surf.Area= 0.043 are Storage= 0.095 of Plug -Flow detention time= (not calculated: outflow precedes inflow) Center -of -Mass det. Lime -34.5 min ( 702.7 - 669.1 ) Volume Invert Avail.Storage Storage Description #1 491.39' 0.109 of 10.00'W x 40.00'Lx 4.00'11 INFILTRATION POND-SWALE Z=3.0 Device Routine Invert Outlet Devices #1 Discarded 491.39' 20.000 in/hr Exflltrafion over Surface area Discarded Outflow Ma 0.97 cfs @ 9.36 In HW -494.96' (Free Discharge) 1=Exflltrafion (Exfiltration Controls 0.97 cfs) Pond 1P: POND-SWALE ■ mnow -- 1.95 cfs -- - -- --'- --,-- -)- -- ■Dnsas a In11QW'Arep=3;2Q5'ac Peak 'EI'ev=49'4.86 $torape=6.0$5' af 0.27 cfs 24 26 28 36 32 34 36 38 46 42 44 46 48 (nouns) W ENID ROAD INDUSTRIAL WAREHOUSE HIGH BANKS ESTATES-SWALE Type L4 24 -hr QUAL17TRainfa11=1.40" Prepared by Goebel Engineering & Surveying Printed 7/22/2020 HydroCAD® 10.00-25 s/n 04646 C 2019 HydroCAD Software Solutions LLC Paee 7 Summary for Subcatchment 1S: STREET +50% LOT Runoff = 0.55 cfs @ 7.90 Ins, Volume= 0.179 at,, Depth= 0.66" Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0.00-49.00 Ins, dt= 0.02 Ins Type IA 24 -hr QUALITY Rainfall=1.40" Area(sf) CN Description • 79,036 99 TOTAL IMPERVIOUS 63,203 39 >75% Grass cover, Good, HSGA 142,239 72 Weighted Average 63,203 44.43% Pervious Area 79,036 55.57°/ Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, MINIMUM TIME Subcatchment 1S: STREET + 50% LOT 0.fi fWnoff ---0.55 cfs --- -- ---- --- ��- 0.55-.' Type IA 24-h'C-- QUALITYRainfall=1.40"__ Runoff Area=142,239_0 °` Runoff V61ume=0.179 of v a. -----Runoff Depth=,0.66"-- € a.3 --------------- 0.2 ---; F 5.D e� e2 ' es , W ENID ROAD INDUSTRIAL WAREHOUSE HIGH BANKS ESTATES-SWALE Type M 24 -hr QUAL17TRainfa11=1.40" Prepared by Goebel Engineering & Surveying Printed 7/22/2020 HydroCAD® 10.00-25 s/n 04646 C 2019 HydroCAD Software Solutions LLC Paee 9 Summary for Pond 1P: POND-SWALE Inflow Area= 3.265 ac, 55.57°/Impervious, Inflow Depth= 0.66" for QUALITY event Inflow = 0.55 cfs @ 7.90 Ins, Volume= 0.179 of Outflow = 0.33 cfs @ 9.20 Ins, Volume= 0.179 af, Atten=419/y Lag= 19.5 min Discarded = 0.33 cfs @ 9.20 Ins, Volume= 0.179 of Routing by Stor-Ind method, Time Span= 0.00-49.00 Ins, dt= 0.02 Ins Peak Elev= 492.30'@ 9.20 Ins Surf.Area= 0.016 ac Storage= 0.012 of Plug -Flow detention time= 5.9 min calculated for 0.179 of (100% of inflow) Center -of -Mass det. Lime -5.9 min ( 701.6 - 695.7 ) Volume Invert Avail.Storage Storage Description #1 491.39' 0.109 of 10.00'W x 40.00'Lx 4.00'11 INFILTRATION POND-SWALE Z=3.0 Device Routine Invert Outlet Devices #1 Discarded 491.39' 20.000 in/hr Exflltrafion over Surface area Discarded Outflow Max=0.33 cfs @ 9.20 In HW -492.30' (Free Discharge) 1=Exflltrafion (Exfiltration Controls 0.33 cfs) Pond 1P: POND-SWALE 0.35 a ,� -U ■ o aea _ _Ihf14Hr;A rea=3.2f5'ac _ .Pea'k- Elev=4921 .30'- Storag'e=0A121 at 44 46 48