presented by Carl Fiset Engineer Centre Lac-Brome December 8, 2012
Contents � Length of the presentation: 1 hour � Current aqueduc network � Supply � Water quality � Consumption � Consumption � 2011-2012 problems � Action Plan � Question period
Units, conversion and abbreviations � Principal flow unit: L/min. (liters per minute) � Secondary flow unit : USGPM (US gallons per minute) � Volume unit: m³ (cubic meters) � 1 m³ (cubic meter) = 1000 L (liters) 1 m³ (cubic meter) = 1000 L (liters) � 1 USGPM = 3,785 l/min. � 1 liter = 0,258 US gals. � MDDEFP: Ministère du Développement Durable, de l’Environnement, Faune et des Parcs � MAMROT: Ministère des Affaires Municipales, Région et Occupation du Territoire
Method used to obtain water � Artesian well � Infiltation gallery
Method used to obtain water Artesian well : � Drilling into the ground where water flows spontaneously � Aquifer: a geological formation that is sufficiently porous and/or fractured or cracked and permeable containing an underground water table (natural replenishment) table (natural replenishment)
Method used to obtain water Infiltration gallery: � Filter pipe(perforated pipe)installed horizontally capturing water from the underground water table using a pump Vent Silt backfill material Coarser sand Strainer 2 to 4 mm Undisturbed soil
Current aqueduc network
AQUEDUC NETWORK: - Network -45,6km of pipes -1,583 residence -175 fire hydrants Bondville Reservoir -one blow-off -142 valves -About 20% leakage = network considered healthy according to MAMROT -Totalproduction: 1,929 L/min. -Production required: 2,750-3,000 L/min. -Production required: 2,750-3,000 L/min. -Deficit to be filled about 1,000 L/min. Bailey Sector: -LB-4-99 -LB-1-97 -(Trial infiltration gallery) -(Permanent infiltration gallery) Jolibourg well Spring Hill Reservoir
Supply � Bailey Sector (Bolton West): 82,4% of total production
Bailey Sector Flow LB-4-99 LB-1-97 � LB-4-99: Jolibourg � Built in1999 � Draws groundwater in an aquifer at the level of the rocky subterranean layer at a depth of 43.3 meters subterranean layer at a depth of 43.3 meters � Authorized at a flow rate of 1,134 L/min. � Chlorinated and pumped to the Spring Hill reservoir � Equipped with a magnetic flowmeter and a water-level probe (lowering of groundwater) � 58.7% of total production
Bailey Sector Flow LB-4-99 LB-1-97 � Well LB-1-97 Jolibourg � Built in 1997 to replace the Bailey 2 well � Draws groundwater in an aquifer of sand and gravel at a depth of 14.34 meters depth of 14.34 meters � Authorized at a flow rate of 455 L/min � Chlorinated and pumped to the Spring Hill reservoir � Equipped with a magnetic flowmeter and a water-level probe (lowering of groundwater) � 23.6% of total production
Bailey Sector � Trial infiltration gallery � Built in 2007 to replace the Bailey surface well, deemed too vulnerable � Small-scale constrution in order to evaluate potentiel � Small-scale constrution in order to evaluate potentiel � Draws groundwater close to Coldbrook Stream at a depth of 3.5 meters using filter pipes (perforted pipes) installed horizontally � Potentiel flow of 280 L/min. � Equipped with a magnetic flowmeter � Operated between November 2009 and August 2012 � No authorization from MDDEFP
Bailey Sector � Permanent infiltration gallery � Built in 2011 to increase the capacity of the small gallery � The large infiltration gallery draws groundwater in the same way as the trial infiltration gallery but at a depth of 6 meters � Flow about 665 L/min. � Manganese concentration of 0.5 mg/L is above the esthetic standard of 0.05 mg/L (no danger for health) 0.05 mg/L (no danger for health) � Treatment possible but expensive: � Green sand filter: $200 000 + installation and building � Capacity for manganese dilution with the other wells: 0.136 mg/L � An increase in the inflow from Coldbrook Stream could possibly reduce the mangenese concentration: repair breach in dam and dredging � Use of large infiltration gallery has the effect of drying up the trial infiltration gallery: 665-280= 385 (a gain of 385 L/min.) � This source could be used with caution in the case of periods of high consumption, low supply or major fire. � No authorization form MDDEFP
Manganese � Permanent infiltration gallery � No danger to health � Unstable in water and precipitates and produces sediment in the form of black silt � Water has bad taste � Water has bad taste � May leave spots on laundry and plumbing accessories � Sticks to conduit walls, reduces flow and can become detached with turbulence � Presence of manganese in low amounts at several locations in the network
Flow Jolibourg Well LB-4-99 LB-1-97 � Built in 1991 Jolibourg � Draws groundwater, in an aquifer of sand and gravel at a depth of 42 meters � Rehabilitated in 1997 � Pumps water directly in the network � Pumps water directly in the network � Current flow of 340 L/min. (authorized at 770 L/min. in 1992) � Building redone in 2009 with a chlorination unit, not connected (cause = time in contact with chlorine insufficient) � Not measured since the work (2009) � Non-chlorinated � 17.6% of production
Spring Hill Reservoir � Built in 1974 (useful life about 50 years = 2024) � Material: Concrete � Capacity of 4,546 m³ � Capacity of 4,546 m³ � Stand-alone capacity (±1500 L/min.) of 48 hours and a stand- alone at maximum flow (±3000 L/min.) of 24 hours � Supplied by a 300 mm PVC conduit (autumn 2007) from the Bailey sector wells: � LB-4-99 � LB-1-97 � (Trial infiltation gallery) � (Permanent infiltration gallery)
Bondville Reservoir � Built in 1974 (useful life about 50 years = 2024) � Material: Concrete � Capacity of 227m³ � Supplied by the Spring Hill reservoir (by gravity): � Peak of 1000 L/min. when recharging Peak of 1000 L/min. when recharging � Buffer reservoir used to supply the Inverness sector (about 130 residences) and to adjust the chlorine concentration when needed (standard: 0.3gm/L). � New chlorination station (not operating) � One flowmeter at the entry and one at the exit (not connected) � Equipped with a modulating valve � Stand-alone about 13 hours (at 355 L/min.)
Instrumentation and controls � 22 water meters already installed and measured every month. � Flowmeters installed: � Spring Hill reservoir (1984) � Spring Hill reservoir (1984) � Bondville reservoir (two not connected) � Well LB-4-99 � Well LB-1-97. � Computer and software recording data installed in the Bailey sector building.
Water Quality � Sampling performed according to the regulations in effect and by certified personnel � No contamination problems in wells or in the network � Monitoring of results handled by the SM laboratory of � Monitoring of results handled by the SM laboratory of Sherbrooke and controlled by the MDDEFP � Water of quality requiring minimal treatment
Consumption 2011 26% LEK Duck Farm 6% Other consumers 68%
Consumption
Knowton Packaging water consumption Knowlton Packaging 2012 Reduction of 18% compared to 2011 to 2011
� 2011: 1,828 m³ of water at a cost of $23,619 were delivered between July 21 and 23 � 2012: June 20 to 23, July 25 to 26, August 1 to3, August 20 to 23, august 29 to 31 � 12,298 m³ (533L/min.) of water at a cost of about $150,000 before Jolibourg well and the trial infiltration gallery were suspended until official authorization was obtained (demand estimated at 2,742L/min.) authorization was obtained (demand estimated at 2,742L/min.) � September 20: official authorization from the MDDEFP to operate the Jolibourg well (acquired right since 1991) � 2012: September 3 to 7, September 10 to14, September 18 to 21, September 25 to 27 for a total of about 13,410,5 m³ � In total 25,708.5 m³ of water at a cost of about $300,000
� Increase in water needs since 2009 � Closing of the trial infiltration gallery since we did not have authorization to operate it � Weather favouring water consumption even though there were water restrictions (pools, gardens, lawns, etc.) there were water restrictions (pools, gardens, lawns, etc.) � No reduction in production capacity � No possibility of increasing production or of using another source under penalty fines
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