APPENDIX D STORMWATER QUALITY CONTROL INFORMATION AND INFILTRATION SIZING

Transcription

1 APPENDIX D STORMWATER QUALITY CONTROL INFORMATION AND INFILTRATION SIZING

2 Source: TRCA/CVC LID Plannign and Design Guide (Version 1.0)

3 Figure Schematic of perforated pipe system integrated with a grass swale Source: Paul Wisner and Associates, 1994

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5 Infiltration Sizing Canterbury GC Redevelopment Project Number: 1704 Date: September 2015 Designer: ETCK Amount Units Remarks Phosphorus Budget Infiltration Volume Required Total Site Area Total Average Annual Rainfall 758 mm Burketon McLaughlin, Ontario Roof Areas to Soakaways Average roof area m 2 Number of lots 124 Roof Area Drainage to Infiltration m 2 Rainfall depth to soakaway 20 mm Soakaway pit storage volume per lot 4.48 m 3 Total soakaway pit storage volume m 3 Represents 90% of average annual rainfall volume, per Figure 1a from the Wet Weather Flow Guideline - City of Toronto Therefore, soakaways infiltrate 90% of average annual rainfall depth Total Annual rainfall on roofs m 3 Annual Rainfall infiltrated from roofs to soakaways m 3 Preliminary Soakaway Pit Sizing Per Lot Porosity Coefficient 0.4 Clear Stone Media Depth 1.0 m Width 2.5 m Length 3.2 m Provided Volume 3.20 m 3 Road Areas to Road Infiltration Trenches (Street E) Road right-of-way (ROW) area 0.57 ha per draft plan of subdivsiion Road right-of-way (ROW) length 240 m per draft plan of subdivsiion Average ROW imperviousness 75% Driveways, pavement, curbs, sidewalk ROW impervious area 4275 m 2 " Driveways outside of right-of-way 1116 m 2 31 lots with 6m x 6m driveways Total Impervious area to storm sewers 5391 m 2 Rainfall depth to road infiltration trenches 20 mm Total road infiltration trench storage volume m 3 Therefore, road infiltration trenches will infiltrate 90% of average annual rainfall depth Total Annual rainfall (impervious areas to storm sewer) 4086 m 3 Represents 90% of average annual rainfall volume, per Figure 1a from the Wet Weather Flow Guideline - City of Toronto Annual Rainfall infiltrated from ROW to infiltration trenches 3678 m 3 rainfall event 90% of average annual rainfall since capturing 20 mm P:\1704 Geranium Simcoe Street Port Perry\Design\SWM\FSP\1704-p budget infiltration.xls

6 Infiltration Sizing Canterbury GC Redevelopment Project Number: 1704 Date: September 2015 Designer: ETCK Preliminary Road Infiltration Trench Sizing Required Infiltration trench volume per road length 0.45 m 3 /m Porosity Coefficient 0.4 Clear Stone Media Depth 1.20 m Width 1.0 m Length 1.0 m Provided Volume per road length 0.48 m 3 /m Road Areas to Road Infiltration Trenches (Street C Window Road Portion, Adjacent to Simcoe Road) Road right-of-way (ROW) area 0.4 ha per draft plan of subdivsiion Infiltration trench length 150 m Block 130 Average ROW imperviousness 75% Driveways, pavement, curbs, sidewalk ROW impervious area 3000 m 2 " Driveways outside of right-of-way 324 m 2 9 lots with 6m x 6m driveways Total Impervious area to storm sewers 3324 m 2 Rainfall depth to road infiltration trenches 20 mm Total road infiltration trench storage volume 66.5 m 3 Therefore, road infiltration trenches will infiltrate 90% of average annual rainfall depth Total Annual rainfall (impervious areas to storm sewer) 2520 m 3 Represents 90% of average annual rainfall volume, per Figure 1a from the Wet Weather Flow Guideline - City of Toronto Annual Rainfall infiltrated from ROW to infiltration trenches 2268 m 3 rainfall event 90% of average annual rainfall since capturing 20 mm Preliminary Road Infiltration Trench Sizing Required Infiltration trench volume per road length 0.44 m 3 /m Porosity Coefficient 0.4 Clear Stone Media Depth 1.20 m Width 1.0 m Length 1.0 m Provided Volume per road length 0.48 m 3 /m Road Areas to Road Infiltration Trenches (Street A Adjacent to lot 5) Road right-of-way (ROW) area 0.33 ha per draft plan of subdivsiion Infiltration trench length 40 m Adjacent to Lot 5 Average ROW imperviousness 75% Driveways, pavement, curbs, sidewalk ROW impervious area 2475 m 2 " Driveways outside of right-of-way 324 m 2 9 lots with 6m x 6m driveways Total Impervious area to storm sewers 2799 m 2 Rainfall depth to road infiltration trenches 20 mm Total road infiltration trench storage volume m 3 Therefore, road infiltration trenches will infiltrate 90% of average annual rainfall depth Total Annual rainfall (impervious areas to storm sewer) 2122 m 3 Represents 90% of average annual rainfall volume, per Figure 1a from the Wet Weather Flow Guideline - City of Toronto Annual Rainfall infiltrated from ROW to infiltration trenches 1909 m 3 rainfall event 90% of average annual rainfall since capturing 20 mm Preliminary Road Infiltration Trench Sizing Required Infiltration trench volume per road length 1.40 m 3 /m Porosity Coefficient 0.4 Clear Stone Media Depth 2.00 m Width 1.8 m Length 1.0 m Provided Volume per road length 1.44 m 3 /m Total Annual Rainfall Volume Infiltrated 7855 m 3 budget) (Excludes soakaways, as already included in water P:\1704 Geranium Simcoe Street Port Perry\Design\SWM\FSP\1704-p budget infiltration.xls

7 Effective Drainage Area to Stormwater Filter Canterbury GC Redevelopment Project Number: 1704 Date: September 2015 Designer: ETCK Catchment 222b - To stormwater filter Total Catchment Area 4.41 ha Total Roof Area 1.29 ha (assumed roof area) Remaining Total Catchment Area 3.12 ha Of remaining Catchment Area: ROW Area % impervious ROW Area impervious-ha Driveways (63 driveways, 6 m x 6 m) 1.30 impervious-ha Weight Runoff Coefficeint for filter sizing Area C CxA Impervious Area Pervious Areas P:\1704 Geranium Simcoe Street Port Perry\Design\SWM\FSP\1704-p budget infiltration.xls

8 Determining Number of Cartridges for Flow Based Systems Date 25/09/2015 Black Cells = Calculation Site Information Project Name Canterbury GC Redevelopment Project Location Port Perry, ON OGS ID MFS Drainage Area, Ad 7.71 ac (3.12 ha) Impervious Area, Ai 2.97 ac Pervious Area, Ap 4.74 % Impervious 39% Runoff Coefficient, Rc 0.50 Treatment storm flow rate, Q treat 1.99 cfs (56.4 L/s) Peak storm flow rate, Q peak TBD cfs Filter System Filtration brand MFS Cartridge height 22 in Specific Flow Rate 1.67 gpm/ft 2 Flow rate per cartridge gpm SUMMARY Number of Cartridges 64 Media Type Perlite Annual TSS Removal 80% Percent Runoff Capture 90% Recommend (2) MFS814 vaults installed in parallel with bypass 2012 CONTECH Engineered Solutions conteches.com 200 Enterprise Drive Scarborough, ME Phone Fax of 1

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10 FOR INFORMATIONAL PURPOSES ONLY NOT INTENDED AS A CONSTRUCTION DOCUMENT - BYPASS AND JUNCTION STRUCTURES MAY OR MAY NOT BE SUPPLIED BY CONTECH - MFS SYSTEM 5'-0" MIN. RECOMMENDED BYPASS MANHOLE JUNCTION MANHOLE BYPASS TO OUTFALL 5'-0" MIN. RECOMMENDED BYPASS WEIR LENGTH AND CREST ELEVATION TO BE DETERMINED BY CONTECH ENGINEERED SOLUTIONS LLC MFS SYSTEM ACTUAL ORIENTATION AND LAYOUT MAY VARY DUE TO SITE SPECIFIC CONSIDERATIONS MEDIA FILTRATION SYSTEM MFS THIS PRODUCT IS PROTECTED BY U.S. PATENT: 6,998,038; RELATED FOREIGN PATENTS, OR OTHER PATENTS PENDING. The design and information shown on this drawing is provided as a service to the project owner, engineer and contractor by Contech Engineered Solutions LLC ("Contech"). Neither this drawing, nor any part thereof, may be used, reproduced or modified in any manner without the prior written consent of Contech. Failure to comply is done at the user's own risk and Contech expressly disclaims any liability or responsibility for such use. If discrepancies between the supplied information upon which the drawing is based and actual field conditions are encountered as site work progresses, these discrepancies must be reported to Contech immediately for re-evaluation of the design. Contech accepts no liability for designs based on missing, incomplete or inaccurate information supplied by others Enterprise Dr ive, Scar borough, ME FAX TYPICAL PARALLEL BYPASS LAYOUT MFS STORMWATER TREATMENT SYSTEM DATE: 3/25/15 SCALE: NONE PROJECT No.: SEQ. No.: N/A DRAWN: SDS CHECKED: ---

11 ECHELON ENVIRONMENTAL 505 HOOD ROAD UNIT 26 MARKHAM, ON L3R 5V6 P E info@echleonenvironmental.ca Annual TSS Removal Efficiency Using Historical Weather Data Area (ha) = 2.12 Engineer: SCS Consulting Group Ltd. C = 0.45 Contact: Erich Knechtel, P. Eng. Rational Conv converts from m3/s to l/s Report Date: 14-Sep-15 CDS Model: PMSU2025_5 Flowrate = 45 l/s Site: Canterbury GC Redevelopment Weather Station: Location: Port Perry, ON PSD: FINE OGS ID: Area 3 Rainfall Intensity Range (mm/hr) Total Rainfall* (mm) Rainfall intensity mm/hr (I) Runoff Rate Per The Rational Method (l/s) Q = C x I x A x 2.77 Rainfall Volume % CDS Flow Rate (l/s) Operating Rate Efficiency** (%) Relative Efficiency (%) % % % % % % % % % % % % % % % % % % % % % % TSS Removal: 88.9% Efficiency Adjustment: 6.5% Net Annual TSS Removal: 82.4% Net Annual Volume Treated: 96.8% * Historical Data including years 1982 to 1998 from Ontario Climate Centre ** CDS Efficiency based on Washington Department of Ecology TAPE Water Quality Control Test Protocol *** Adjustment for use of 60 minute time step data on site with a time of concentration less than 30 minutes

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14 ECHELON ENVIRONMENTAL 505 HOOD ROAD UNIT 26 MARKHAM, ON L3R 5V6 P E info@echleonenvironmental.ca Annual TSS Removal Efficiency Using Historical Weather Data Area (ha) = 7.92 Engineer: SCS Consulting Group Ltd. C = 0.45 Contact: Erich Knechtel, P. Eng. Rational Conv converts from m3/s to l/s Report Date: 24-Sep-15 CDS Model: PMSU4040_8 Flowrate = 170 l/s Site: Canterbury GC Redevelopment Weather Station: Location: Port Perry, ON PSD: FINE OGS ID: Area 1 & 2 Rainfall Intensity Range (mm/hr) Total Rainfall* (mm) Rainfall intensity mm/hr (I) Runoff Rate Per The Rational Method (l/s) Q = C x I x A x 2.77 Rainfall Volume % CDS Flow Rate (l/s) Operating Rate Efficiency** (%) Relative Efficiency (%) % % % % % % % % % % % % % % % % % % % % % % TSS Removal: 89.0% Efficiency Adjustment: 6.5% Net Annual TSS Removal: 82.5% Net Annual Volume Treated: 96.8% * Historical Data including years 1982 to 1998 from Ontario Climate Centre ** CDS Efficiency based on Washington Department of Ecology TAPE Water Quality Control Test Protocol *** Adjustment for use of 60 minute time step data on site with a time of concentration less than 30 minutes

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