NV C-23 DRILLING WELLS EXAMPREP TEST
PAPER 2026 TESTED QUESTIONS WITH FULL
SOLUTION SET
◉ (E) What is meant by "trop-plein" (overflow) in relation to well
construction? Answer: An overflow is a pipe or opening installed in
wells with artesian pressure that allows excess water to discharge in
a controlled manner when the natural flow exceeds usage. It
prevents pressure buildup that could damage the well or create
uncontrolled flow around the casing. Overflows must be designed to
prevent backflow or entry of contaminants, typically by including
screening and a check valve or atmospheric gap at the discharge
point, in accordance with the Regulation respecting groundwater
catchment.
◉ (M) What is "hydrofracturation" (hydrofracturing) and when is it
used in water well construction? Answer: Hydrofracturing is a
technique used to increase the yield of low-producing wells in
bedrock formations by injecting water under high pressure into the
well to create or enlarge existing fractures in the rock. It is used
when: (1) A well in bedrock has insufficient yield for the intended
use; (2) Existing fractures are clogged or limited; (3) The formation
is known to be capable of yielding more water if additional fractures
are accessed; (4) Existing fracture patterns suggest the technique
will be effective; and (5) There is no risk of connecting to
contaminated water sources or creating problems for neighboring
,wells. The procedure must be performed by specialists with
appropriate equipment and pressure monitoring.
◉ (D) A rural municipality needs a new public water supply well
with a minimum yield of 300 gal/min (1,136 l/min). The geological
assessment indicates a deep confined aquifer with artesian pressure.
What special design considerations should be included? Answer:
Special design considerations should include: (1) Pressure-rated
casing and well components to handle artesian conditions; (2)
Multiple casing strings with verified pressure-tested seals between
casings; (3) High-strength grout formulation capable of setting
under flowing water conditions; (4) Flow control mechanisms at the
wellhead including pressure gauges and control valves; (5) Specially
designed well cap with pressure relief capabilities; (6) Controlled
overflow system with proper disposal considerations; (7) Enhanced
surface completion to prevent erosion around the wellhead; (8)
Consideration of step-down design in the wellhead assembly to
reduce pressure gradually; (9) Comprehensive monitoring systems
for pressure, flow, and water quality; (10) Emergency shutdown
capabilities; (11) Specialized development techniques appropriate
for confined aquifers; and (12) A detailed aquifer management plan
to prevent excessive drawdown and maintain artesian conditions. All
designs must comply with Quebec's regulations for public water
supplies and the Regulation respecting groundwater catchment.
◉ (E) What is "debit instantane requis" (required instantaneous
flow rate) and how does it differ from "debit moyen d'exploitation"
(average operating flow rate)? Answer: The required instantaneous
,flow rate refers to the maximum flow rate needed during peak
demand periods, such as when multiple fixtures are used
simultaneously. It determines the pump and pressure tank sizing.
The average operating flow rate refers to the typical water
consumption averaged over time, which determines the required
sustainable well yield. For example, a residential system might have
an instantaneous requirement of 10-15 gal/min (37.8-56.8 l/min)
for short periods but an average operating flow of only 2-3 gal/min
(7.6-11.4 l/min) over a 24-hour period.
◉ (M) What are the requirements for "geothermie" (geothermal)
wells in Quebec and how do they differ from water supply wells?
Answer: Geothermal wells in Quebec must meet all standard well
construction requirements plus: (1) The loop materials must be
high-density polyethylene or equivalent rated for geothermal
applications; (2) Heat transfer fluids must be non-toxic and
approved for the application; (3) The annular space must be
completely filled with a thermally enhanced grout mixture; (4)
Systems must be pressure-tested before operation; (5) Special
attention must be paid to prevent cross-contamination between
aquifers; (6) Detailed documentation of loop placement is required.
Unlike water supply wells, geothermal wells: (7) Do not require
potable water considerations; (8) Often are installed in multiple-
well fields; (9) May have different setback requirements; (10) Must
comply with both water regulations and energy system standards
(CSA C448); and (11) May have specific reporting requirements to
both water and energy authorities.
, ◉ (E) What is "capacite specifique" (specific capacity) of a well and
how is it calculated? Answer: Specific capacity is a measure of well
performance expressed as flow rate per unit of drawdown, typically
in gallons per minute per foot (gal/min/ft) or liters per minute per
meter (l/min/m). It is calculated by dividing the pumping rate by the
drawdown (the difference between static water level and pumping
water level). For example, if a well produces 10 gal/min (37.8 l/min)
with 20 ft (6.1 m) of drawdown, the specific capacity is 0.5
gal/min/ft (6.2 l/min/m). This measurement indicates well
efficiency and is used to track performance over time.
◉ (M) What is meant by "vulnerabilite des formations aquiferes"
(vulnerability of aquifer formations) and how does it affect well
construction requirements? Answer: Aquifer vulnerability refers to
the susceptibility of groundwater to contamination based on natural
geological and hydrogeological characteristics. Factors affecting
vulnerability include depth to water table, recharge rate, soil type,
topography, vadose zone characteristics, and hydraulic conductivity.
In highly vulnerable areas, well construction requirements are more
stringent, typically requiring deeper casings, more extensive
grouting, additional surface protection, greater setbacks from
contamination sources, and potentially more frequent water quality
monitoring, as specified in the Regulation respecting groundwater
catchment.
◉ (D) A client needs a well for a remote hunting camp where drilling
equipment access is severely limited by terrain. The camp requires
approximately 500 gallons (1,893 liters) per day during seasonal
PAPER 2026 TESTED QUESTIONS WITH FULL
SOLUTION SET
◉ (E) What is meant by "trop-plein" (overflow) in relation to well
construction? Answer: An overflow is a pipe or opening installed in
wells with artesian pressure that allows excess water to discharge in
a controlled manner when the natural flow exceeds usage. It
prevents pressure buildup that could damage the well or create
uncontrolled flow around the casing. Overflows must be designed to
prevent backflow or entry of contaminants, typically by including
screening and a check valve or atmospheric gap at the discharge
point, in accordance with the Regulation respecting groundwater
catchment.
◉ (M) What is "hydrofracturation" (hydrofracturing) and when is it
used in water well construction? Answer: Hydrofracturing is a
technique used to increase the yield of low-producing wells in
bedrock formations by injecting water under high pressure into the
well to create or enlarge existing fractures in the rock. It is used
when: (1) A well in bedrock has insufficient yield for the intended
use; (2) Existing fractures are clogged or limited; (3) The formation
is known to be capable of yielding more water if additional fractures
are accessed; (4) Existing fracture patterns suggest the technique
will be effective; and (5) There is no risk of connecting to
contaminated water sources or creating problems for neighboring
,wells. The procedure must be performed by specialists with
appropriate equipment and pressure monitoring.
◉ (D) A rural municipality needs a new public water supply well
with a minimum yield of 300 gal/min (1,136 l/min). The geological
assessment indicates a deep confined aquifer with artesian pressure.
What special design considerations should be included? Answer:
Special design considerations should include: (1) Pressure-rated
casing and well components to handle artesian conditions; (2)
Multiple casing strings with verified pressure-tested seals between
casings; (3) High-strength grout formulation capable of setting
under flowing water conditions; (4) Flow control mechanisms at the
wellhead including pressure gauges and control valves; (5) Specially
designed well cap with pressure relief capabilities; (6) Controlled
overflow system with proper disposal considerations; (7) Enhanced
surface completion to prevent erosion around the wellhead; (8)
Consideration of step-down design in the wellhead assembly to
reduce pressure gradually; (9) Comprehensive monitoring systems
for pressure, flow, and water quality; (10) Emergency shutdown
capabilities; (11) Specialized development techniques appropriate
for confined aquifers; and (12) A detailed aquifer management plan
to prevent excessive drawdown and maintain artesian conditions. All
designs must comply with Quebec's regulations for public water
supplies and the Regulation respecting groundwater catchment.
◉ (E) What is "debit instantane requis" (required instantaneous
flow rate) and how does it differ from "debit moyen d'exploitation"
(average operating flow rate)? Answer: The required instantaneous
,flow rate refers to the maximum flow rate needed during peak
demand periods, such as when multiple fixtures are used
simultaneously. It determines the pump and pressure tank sizing.
The average operating flow rate refers to the typical water
consumption averaged over time, which determines the required
sustainable well yield. For example, a residential system might have
an instantaneous requirement of 10-15 gal/min (37.8-56.8 l/min)
for short periods but an average operating flow of only 2-3 gal/min
(7.6-11.4 l/min) over a 24-hour period.
◉ (M) What are the requirements for "geothermie" (geothermal)
wells in Quebec and how do they differ from water supply wells?
Answer: Geothermal wells in Quebec must meet all standard well
construction requirements plus: (1) The loop materials must be
high-density polyethylene or equivalent rated for geothermal
applications; (2) Heat transfer fluids must be non-toxic and
approved for the application; (3) The annular space must be
completely filled with a thermally enhanced grout mixture; (4)
Systems must be pressure-tested before operation; (5) Special
attention must be paid to prevent cross-contamination between
aquifers; (6) Detailed documentation of loop placement is required.
Unlike water supply wells, geothermal wells: (7) Do not require
potable water considerations; (8) Often are installed in multiple-
well fields; (9) May have different setback requirements; (10) Must
comply with both water regulations and energy system standards
(CSA C448); and (11) May have specific reporting requirements to
both water and energy authorities.
, ◉ (E) What is "capacite specifique" (specific capacity) of a well and
how is it calculated? Answer: Specific capacity is a measure of well
performance expressed as flow rate per unit of drawdown, typically
in gallons per minute per foot (gal/min/ft) or liters per minute per
meter (l/min/m). It is calculated by dividing the pumping rate by the
drawdown (the difference between static water level and pumping
water level). For example, if a well produces 10 gal/min (37.8 l/min)
with 20 ft (6.1 m) of drawdown, the specific capacity is 0.5
gal/min/ft (6.2 l/min/m). This measurement indicates well
efficiency and is used to track performance over time.
◉ (M) What is meant by "vulnerabilite des formations aquiferes"
(vulnerability of aquifer formations) and how does it affect well
construction requirements? Answer: Aquifer vulnerability refers to
the susceptibility of groundwater to contamination based on natural
geological and hydrogeological characteristics. Factors affecting
vulnerability include depth to water table, recharge rate, soil type,
topography, vadose zone characteristics, and hydraulic conductivity.
In highly vulnerable areas, well construction requirements are more
stringent, typically requiring deeper casings, more extensive
grouting, additional surface protection, greater setbacks from
contamination sources, and potentially more frequent water quality
monitoring, as specified in the Regulation respecting groundwater
catchment.
◉ (D) A client needs a well for a remote hunting camp where drilling
equipment access is severely limited by terrain. The camp requires
approximately 500 gallons (1,893 liters) per day during seasonal
