Surface Water Wellhead Protection Area E WHPA-E Consultation - - PowerPoint PPT Presentation

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Surface Water Wellhead Protection Area E WHPA-E Consultation - - PowerPoint PPT Presentation

Mar 08, 2024 32 likes •237 views

Consultation February 2015 Consultation February 2015 Saugeen Sa Sa Saugeen en, Gr en, Gr Grey Grey ey Sa ey Sa Sauble, Nor Sauble, Nor orth orth ther ther ern Bru ern Bru Bruce Bruce e Pen e Pen Peninsula Sou Peninsula Sou

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Groundwater Under the Direct Influence of Surface Water

Wellhead Protection Area E

WHPA-E

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Wellhead Protection Areas

  • WHPA-A: a 100 m radius around a municipal well
  • WHPA-B: the area where water can flow to the well in 2 years
  • WHPA-C: the area where water can flow to the well in 5 years
  • WHPA-D: the area where water can flow to the well is less than

25 years and not within WHPAs A, B or C

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WHPA-E

  • WHPA-Es can only apply to GUDI wells

– GUDI is groundwater under the direct influence of surface water

  • WHPA-E is the 2-hour time-of-travel (ToT) within the surface

water body that influences the well

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WHPA-E

  • WHPA-Es have been delineated for the following wellheads:

– Tobermory (MNBP) – Oliphant, Amabel-Sauble, Huron Woods, Foreman, Shallow Lake, Pottawatomi, Tara, Chatsworth, Walter’s Falls and Kimberley (GSCA) – Chepstow, Hanover, Lake Rosalind, Markdale, Neustadt and Durham (SVCA)

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WHPA-E Delineation

  • Identification of a point within a surface water body where

interaction with the groundwater aquifer is most likely:

– If the point is within a small water body and water from anywhere in the water body can reach the point in less than 2 hours during any two-year runoff event, the WHPA-E includes the entire water body – If the point is within a large water body, the delineation of the WHPA- E requires other variables, such as the streamflow velocity to delineate the two-hour ToT

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WHPA-E Delineation

  • From this point, the 2-hour ToT must be delineated
  • For all streams that are within the 2-hour ToT, the 120-metre

setback, Conservation Authority regulation limits and further transport pathways (e.g. agricultural tile drainage) were added

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WHPA-E Redelination (2014)

  • Most WHPA-E delineations encompass the entire waterbody,

but six are on larger watercourses. They are;

– Amabel-Sauble, Tara, Chatsworth, Walter’s Falls, Chepstow and Durham

  • These six were chosen for redelineation
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WHPA-E Redelination (2014)

  • Why redelineate?

– Updated stream network – Updated elevation model (terrain) – Used new software to find more accurate stream velocities – Updated regulated areas from CA – Assumed all fields were tile drained

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  • Created 1 m DEMs using SOCET GXP (Grey Sauble’s new 3D

software) with SWOOP 2010 data

Methodology

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NEW OLD

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  • Collected stream cross-section information from the DEM by

drawing profiles in 3D Stereo viewing

– Representative cross-section for each unique stream section

Methodology

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  • Used Conveyance Estimation System (CES) Software to model stream velocities
  • Inputs

– Cross-Section Data – Roughness (used previous fieldwork images) – Slope (calculated using elevation values from new DEM)

  • Output

– Graph of average velocity (m/s) with change in elevation – Use the velocity at bank-full

Methodology

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  • Apply representative velocities to stream segments and

calculate upstream to 2-hr ToT

Methodology

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WHPA-E Threats

  • Activities within properties located within the WHPA-E may be

considered a threat to the drinking water source

  • WHPA-E threats;

– Application of ASM, NASM and grazing – Storage (permanent and temporary) of ASM, NASM and outdoor livestock yards

  • Policies will apply
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WHPA-F

  • If the water quality of the well shows contamination that

cannot be attributed to WHPA A-D or the surface water in the vicinity (WHPA-E), a larger contributing area may be delineated (WHPA-F)

  • No WHPA-F has been delineated for this region
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Thank You

Questions?

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Emily Vandermeulen

Program Supervisor

e.vandermeulen@waterprotection.ca (519) 470-3000 x 105