Barrie Creeks, Lovers Creek, and Hewitt's Creek Subwatershed Plan

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The Barrie Creeks, Lovers Creek and Hewitt’s Creek Subwatershed Plan Table 4-17: Tier One results - current annual groundwater stress assessment (SGBLS, 2009) Subwatershed Surplus Annual AvailableSupply Reserve Groundwater GW Area Precip AET Baseflow Water Mean Flow GW SW GW SW Consumption Stress km2 mm/a mm/a mm/a m3/s mm/a m3/s mm/a mm/a m3/s mm/a m3/s mm/a m3/s mm/a m3/s m3/a mm/a % Hewitts Creek 18 890 562 328 0.1 240 0.1 114 202 0.1 302 0.2 11 0.00 71 0.04 257,000 15 8% Lovers Creek 60 873 560 313 0.4 232 0.2 112 194 0.4 195 0.4 11 0.01 74 0.14 610,000 10 6% Barrie Creeks 38 905 563 341 0.3 226 0.1 110 226 0.3 218 0.3 11 0.01 73 0.09 13,220,000 352 164% Note: Values rounded for presentation purposes 10 - 24% of available supply being taken AET - Actual Evapotranspiration 25% or more of available supply being takenGW - Groundwater SW - Surface Water Table 4-18: Tier One results - future annual groundwater stress assessment (SGBLS, 2009). Surplus Annual AvailableSupply Reserve Groundwater GW Area Precip AET Baseflow Subwatershed Water Mean Flow GW SW GW SW Consumption Stress km2 mm/a mm/a mm/a m3/s mm/a m3/s mm/a mm/a m3/s mm/a m3/s mm/a m3/s mm/a m3/s m3/a mm/a % Hewitts Creek 18 890 562 328 0.1 240 0.1 114 202 0.1 302 0.2 11 0.00 71 0.04 357,000 20 11% Lovers Creek 60 873 560 313 0.4 232 0.2 112 194 0.4 195 0.4 11 0.01 74 0.14 928,000 15 8% Barrie Creeks 38 905 563 341 0.3 226 0.1 110 226 0.3 218 0.3 11 0.01 73 0.09 13,231,000 353 164% Note: Values rounded for presentation purposes 10 - 24% of available supply being taken AET - Actual Evapotranspiration 25% or more of available supply being takenGW - Groundwater SW - Surface Water Table 4-19: Tier One results - current monthly groundwater stress assessment (SGBLS, 2009). Subwatershed Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Lovers Creek 5% 4% 5% 5% 5% 8% 8% 8% 8% 4% 4% 5% Barrie Creeks 168% 151% 170% 167% 168% 160% 164% 164% 159% 166% 162% 168% Hewitt’s Creek 8% 7% 8% 8% 8% 8% 8% 8% 8% 7% 8% 8% Moderate Significant >25% & < 50% >50% >20% & 50% Chapter 4: Water Quantity – Surface and Groundwater 195
The Barrie Creeks, Lovers Creek and Hewitt’s Creek Subwatershed Plan Tier 2 Water Budget Results The objectives and approach of the Tier 2 Water Budget Assessment are similar to those of the Tier 1 in that the overall goal is to quantify water supply, reserve, and demand. Once these budget components are estimated the “percent water demand” equation and stress level assessment screening thresholds are the same between Tiers. The methods used to quantify the water budget components, however, are more robust in a Tier 2 study (AquaResource and Golder, 2010). The Tier 2 Water Budget for the Barrie Creeks, Lovers Creek, and Hewitt’s Creek subwatersheds (AquaResource and Golder, 2010) conducted a comparison analysis of existing, planned, and future conditions for average annual, monthly basis, and two-year drought scenarios. The completion of the analysis helps to determine whether stress on the groundwater resources can be anticipated under various scenarios. The stress assessment evaluates the ratio of the consumptive demand for permitted and non-permitted users to water supplies, minus water reserves, within each subwatershed. The major components of the water budget have been estimated and tabulated as described in the preceding sections, including water supply, water demand, and water reserve. Existing Conditions The percent water demand was calculated for the Barrie Creeks and Hewitt’s Creek subwatersheds using estimates of groundwater supply, reserve, and consumptive demand. The water demand used in the stress assessment is discussed in Sections 4.3.3 and 4.4.1. The estimated consumptive demand for permitted and non-permitted users was used in calculating the subwatershed’s potential for stress under existing conditions. The groundwater supply component for the stress assessment was calculated as being the average annual recharge plus the lateral inflow of groundwater to the subwatershed. The groundwater reserve component of the stress assessment was calculated to be 10% of the estimated groundwater discharge to streams. The volume of groundwater discharge on a subwatershed basis was estimated using the FEFLOW numerical model and is illustrated on Figure 4-10. The figure illustrates that the Lake Simcoe portion of the study area discharges very little groundwater on an annual basis, less than 500 L/s. The results of the existing conditions stress assessment are shown on Table 4-20, Table 4-21, and Table 4-22. The existing conditions stress assessment indicated that the Barrie Creeks subwatershed has the potential to be significantly stressed, whereas the Hewitt’s and Lovers did not. Table 4-20: Groundwater stress assessment - existing conditions (AquaResource and Golder, 2010). Subwatershed Groundwater Supply (L/s) Recharge Flow In Total Supply Ground water Reserve (L/s) Consumptive Demand (L/s) Annual Average Monthly Maximum Month of Max Demand Percent Water Demand (%) Annual Average Monthly Maximum Hewitt’s & Lovers Creek 312 0 312 19 21 30 June 7% 10% Barrie Creeks (includes a small portion of Willow Creek that contains a Barrie well) 251 362 614 0 470 522 July 77% 85% Chapter 4: Water Quantity – Surface and Groundwater 196
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Barrie Creeks, Lovers Creek, and He
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Acknowledgements The Barrie Creeks,
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• East of the Barrie Creeks subwa
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Fish Habitat -Fish communities in t
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Table of Contents TABLE OF CONTENTS
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3.5.4 Water Temperature - thermal d
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5.3.11 Climate Change 237 5.4 ASSES
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6.5.10 Improving data management 31
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LIST OF FIGURES CHAPTER 1 Figure 1-
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Figure 2-34: Annual precipitation (
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CHAPTER 4 Figure 4-1: Hydrologic cy
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Figure 5-11: Pathways by which impe
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Figure 7-11: Riparian area with app
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Table 3-4: Surface water quality co
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CHAPTER 5 Table 5-1: Fish species c
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The Barrie Creeks, Lovers Creek and
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Creek ANNE ST N BAYFIELD ST N LINE
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7.4 Urban interactions - land use,
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Barrie Creeks, Lovers Creek, and Hewitt's Creek Subwatershed Plan

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