CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region www.ctcswp.ca CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region Tier 1 Water Budget CTC SPC Meeting # 2/09 – Agenda Item # 6.1 February 17, 2009 Gayle SooChan, P.Geo. Director, Groundwater Resources, CLOCA Dirk Kassenaar, M.Sc. P.Eng E.J. Wexler, M.Sc., M.Sc. (Eng) 1 Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region www.ctcswp.ca CLOSPA Tier 1 Water Budget Process/ Timelines • Earthfx Inc. – Prepared the T1 Water Budget Study for the CLOCA jurisdiction – draft completed Jan 08 • Peer Review process initiated Feb 08 • Revised per comments and re-circulated to Peer reviewers for sign-off Aug 08 • Additional comments received from municipality Oct 08 • Revised per final comments, distributed to SPC Feb 09 for acceptance • Formal Peer Review Team : Durham Region (Works Dept.), Papadoupolos & Associates, Dr. R. Gerber, TCC Source Protection Region, Ministry of Natural Resources, Conservation Ontario. • MOE-CR and LSGB Source Protection Region were also invited to comment and provided material. No comments were however received. Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region www.ctcswp.ca Peer Review Comments: on Draft Tier 1 • In our opinion, this is an excellent report that provides a solid framework for those charged with managing water-resources in the CLOCA area. • The analyses have been conducted to a high technical standard. • Peer Reviewers main suggestions for revisions were associated with some unique methodologies in determination of the groundwater supply factor which affected the stress calculations. The study team was directed to revise the document to ensure provincial consistency in results. • Revisions/corrections were also made to the PTTW data used by the review team. These corrections resulted in revised stress calculations. • Revisions were also made to ensure compliance with the Directors Rules (changes since the historical technical guidance). Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region www.ctcswp.ca CLOSPA Tier 1 Water Budget Presentation • Earthfx Inc.: • Dirk Kassenaar, M.Sc. P.Eng • E.J. Wexler, M.Sc., M.Sc. (Eng) Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region www.ctcswp.ca CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region Draft Accepted Tier 1 Water Budget for the Central Lake Ontario Source Protection Area Meeting Presentation – February 17, 2009 Dirk Kassenaar, M.Sc., P.Eng. EJ Wexler, M.Sc. M.E. P.Eng. Earthfx Inc. 5 Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region www.ctcswp.ca Presentation Outline • Tier 1 Water Budget Objectives • Overview of Selected Approach • Subwatershed assessment areas • Modelling approach • CLOCA Watersheds: Overview • Summary of Tier 1 Water Budget Components • Water Demand, Supply, Reserve • Stress Assessment Results • SGRA Analysis • Conclusions Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region www.ctcswp.ca Tier 1 Water Budget: Objectives and Steps • A Tier 1 water budget is a screening level assessment of water supply and water demand in the study area • Identify subwatersheds needing a more detailed assessment • Calculate “% Water demand” = Water Demand/Supply • Calculated on annual and monthly basis for both groundwater and surface water • Assign a low, moderate or significant “stress” level based on thresholds • Think Low, Medium or High “ Relative Demand Level” • Thresholds are conservative and meant only for screening • A Tier 2 is a more detailed and complex assessment to confirm the stress levels, • A Tier 3 is needed to actually assess sustainability, risk and ecological stress • Additional analysis included in this study: • SGRA – Significant Groundwater Recharge Areas Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region www.ctcswp.ca Water Budget Components Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region www.ctcswp.ca Overview of CLOCA Tier 1 Approach • Delineate assessment areas (subwatersheds): Guidance recommends 20 to 100 km 2 assessment area • • Estimate Water Demand: • Compile MOE permit data, estimate rural and agricultural water use • Correct water demand for locally returned water (consumptive use) and seasonal usage patterns • Estimate Water Supply: • Tier 1 Guidance allows either spreadsheet or numerical flow model • Modelling approach selected for CLOCA: adapt existing models • USGS MODFLOW (groundwater flow model) • USGS PRMS (Precipitation – Surface Runoff model) • Calculate % Water Demand and assign stress levels Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region www.ctcswp.ca CLOCA Subwatersheds: Overview • Location • South slope of Oak Ridges Moraine • Geologic environment • 1 Minute geologic history of CLOCA • High recharge Oak Ridges Moraine sediments both within and just north of CLOCA study area • Subwatershed Assessment Areas • Surface watershed boundaries not necessarily groundwater shed boundaries (lateral groundwater underflow) Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CLOCA Subwatersheds www.ctcswp.ca Bowmanville CLOCA Oshawa Soper Lynde Harmony Darlington Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region Land Use Classification www.ctcswp.ca Bowmanville Oshawa Soper Lynde Harmony Darlington Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region Physiography www.ctcswp.ca Bowmanville Oshawa Soper Lynde Harmony Darlington Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region Surficial Geology www.ctcswp.ca Bowmanville Oshawa Soper Lynde Harmony Darlington Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region Geologic Cross Section www.ctcswp.ca B A Oak Ridges Aquifer Thorncliffe Aquifer Scarborough Aquifer B A Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region www.ctcswp.ca Subwatershed Assessment Areas • Assessment area logically selected based on historic Area Watershed km2 surface water subwatersheds Lynde Creek 132 Pringle Creek 28 Guidance recommends 20 to 100 km 2 areas • Corbett Creek 15 Goodman Creek 10 Selected areas: 6 to 132 km 2 • Oshawa Creek 110 Harmony Creek 47 Farewell Creek 36 • However: surface watershed boundaries not always a Robinson Creek 6 good indication of groundwatershed boundaries Tooley Creek 11 Black Creek 24 Darlington Creek • Multiple aquitard layers isolate the lower aquifers, 16 Bowmanville Creek 90 allowing underflow Westside Creek 6 Soper Creek 75 Bennet Creek 7 • Model area extends beyond CLOCA boundaries to allow Lake Catchments 24 calculation of lateral inflows • Note: Some other studies have assumed that lateral inflows are negligible at a Tier 1 assessment level Made possible through the support of the Government of Ontario
CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region CTC Source Protection Region Model Area www.ctcswp.ca Made possible through the support of the Government of Ontario
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