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FL Well Driller practice questions

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Question 1Florida licensing, permits and accountable records

A contractor holds a Florida water well contractor license issued through one water management district. What does the DEP guidance say about the geographical validity of that license?

  1. It is valid statewide, while project permissions still need separate review Correct answer.
  2. It is valid only within one street of the issuing office
  3. It replaces every well and water-use permit automatically
  4. It is valid in every other US state without another requirement

Explanation

DEP expressly states that a contractor license is valid statewide. That does not eliminate the separate permit for a particular well activity or authorize work under another state’s licensing system.

Question 2Florida licensing, permits and accountable records

A licensed driller is asked to abandon an existing water well in the South Florida district. Which permission issue must be addressed before work?

  1. Only the owner’s verbal consent replaces every permit
  2. The applicable well-abandonment permit through the district or its delegated authority Correct answer.
  3. Only a new license from a different state
  4. No permission can apply because the well is old

Explanation

SFWMD lists abandonment among activities requiring a well construction permit. Contractor licensing, owner consent and the well’s age do not themselves replace the actual project permission.

Question 3Florida licensing, permits and accountable records

A Florida contractor license application is being prepared by a resident whose principal business is within a particular district. Which authority does section373.323 identify for the application?

  1. Any foreign groundwater association
  2. Only a private pump manufacturer
  3. The water management district of residence or principal place of business Correct answer.
  4. Only the federal postal service

Explanation

The statute directs a resident’s application to the water management district in which the applicant resides or has the principal place of business. The separate nonresident provision addresses where most business will occur.

Question 4Florida licensing, permits and accountable records

A person says Florida water well licensure is handled only through a general building-contractor board and no water management district is involved. Which framework matches section373.323?

  1. Every well license is issued by the owner personally
  2. No professional license exists for water well contracting
  3. Every permit is issued only by the federal Environmental Protection Agency
  4. Licensure under this part is obtained from the water management district Correct answer.

Explanation

Section373.323 places water well contractor licensing with water management districts. It is a specific statutory framework, not an assumption borrowed from a general contractor credential.

Question 5Florida licensing, permits and accountable records

A driller argues that because the construction definition excludes pumping equipment, a licensed water well contractor can never install any pump or tank. What does the current statute separately provide?

  1. Licensed contractors may perform the described pump-and-tank work in accordance with the applicable plumbing-code provision Correct answer.
  2. Every person may do all electrical work without qualifications
  3. The construction definition repeals the entire licensing law
  4. Only a foreign pump certificate determines Florida scope

Explanation

Section373.323 separately addresses licensed water well contractors installing, repairing and modifying pumps and tanks in accordance with the specified plumbing-code provision. A construction definition must not be substituted for the complete statutory scope.

Question 6Florida licensing, permits and accountable records

A business offers water well drilling services but is neither owned by a licensed contractor nor employing a full-time licensed water well contractor. Which issue is identified in section373.336?

  1. The owner’s signature makes all licensing rules inapplicable
  2. The described advertising is prohibited Correct answer.
  3. A social-media advertisement automatically creates a license
  4. Only the color of the company vehicle matters

Explanation

The unlawful-acts section specifically addresses advertising drilling or construction services without the stated licensed ownership or employment connection. An advertisement does not create the missing professional authorization.

Question 7Florida licensing, permits and accountable records

A business entity hires a licensed contractor only to put a name on its paperwork while unlicensed personnel perform required contracting activities without that contractor’s supervision. Which statutory concern applies?

  1. A business entity is exempt from every well licensing rule
  2. Supervision is unnecessary whenever the invoice is paid
  3. A licensed contractor must be responsible for supervising the required activities Correct answer.
  4. A borrowed name automatically satisfies the supervision requirement

Explanation

Section373.336 requires a licensed water well contractor to be responsible for supervising the entity’s activities that require that license. Merely displaying a name is not the stated supervision.

Question 8Florida licensing, permits and accountable records

A contractor’s Florida water well license has been placed on inactive status. What does the unlawful-acts section say about attempting to use it to practice?

  1. It is allowed until a customer complains
  2. It is automatically restored by buying materials
  3. It becomes valid when another person signs the invoice
  4. It is prohibited Correct answer.

Explanation

The statute prohibits using or attempting to use a suspended, revoked or inactive license for water well contracting. Commercial activity does not itself restore an inactive credential.

Question 9Florida licensing, permits and accountable records

An applicant submits forged experience evidence to obtain a water well license. Which conclusion follows from section373.336?

  1. Giving false or forged evidence to obtain the license is unlawful Correct answer.
  2. Forgery is allowed if the applicant can operate a drill
  3. The evidence becomes valid after one successful job
  4. Only the applicant’s preferred district can decide whether truth matters

Explanation

The unlawful-acts provision expressly includes false or forged licensing evidence. Practical skill or one completed project does not make a fabricated application truthful.

Question 10Florida licensing, permits and accountable records

A driller presents another person’s license as their own when bidding for work. Which principle does section373.336 state?

  1. Only the printed expiry date matters, not the license holder
  2. Presenting another person’s license as one’s own is unlawful Correct answer.
  3. Any license can be borrowed for a single project
  4. The customer may transfer the license by verbal agreement

Explanation

The statute specifically prohibits presenting another person’s license as one’s own. Consent from a customer or temporary use does not change the holder’s identity.

Question 11Florida licensing, permits and accountable records

A trainee operates drilling equipment for water well construction. Which relationship is addressed by the Florida unlawful-acts provision, subject to any actual statutory exemption?

  1. Only owning the land on which every commercial job occurs
  2. Only having a driver license
  3. Employment by or supervision of a licensed water well contractor Correct answer.
  4. Only membership in a general online forum

Explanation

Section373.336 addresses constructing, repairing or abandoning wells and operating drilling equipment for that purpose without the stated employment or supervision relationship, unless an actual statutory exemption applies.

Question 12Florida licensing, permits and accountable records

A contractor assumes Florida’s water well statute covers every borehole drilled to prospect for oil or natural gas. Which distinction does DEP’s statutory definition make?

  1. Every drilled hole is automatically a potable water well
  2. A deeper borehole is always exempt from every law
  3. A water well license automatically authorizes petroleum extraction
  4. The stated water-well definition excludes the listed oil, gas and mining purposes Correct answer.

Explanation

DEP reproduces the statutory definition and its exclusions for the listed oil, natural gas and mining purposes. A shared drilling method does not make all excavation types the same regulated activity.

Question 13Florida licensing, permits and accountable records

Which listed description matches the Florida rule definition of construction of water wells, distinguished from separate statutory authorization for pump-and-tank work?

  1. Only the drilling of the well bore
  2. All parts necessary to obtain groundwater by wells, excluding pump installation Correct answer.
  3. Installation of pumps and pumping equipment only
  4. Both well construction and pump installation

Explanation

The construction definition covers acts needed to obtain groundwater by wells and excludes pumping equipment in that definition. Current section 373.323 separately addresses licensed contractors’ pump-and-tank work under the applicable plumbing code. The definition must not be misread as a universal prohibition on that separately authorized work.

Question 14Florida licensing, permits and accountable records

How many letters attesting to an applicant's experience are required for a Florida water well contractor license application?

  1. One letter
  2. Two letters
  3. Three letters Correct answer.
  4. Five letters

Explanation

Florida requires three letters attesting to the applicant's well drilling experience from qualified persons such as a water well contractor, a well driller, a water well parts and equipment vendor, or a well inspector employed by a government agency.

Question 15Florida licensing, permits and accountable records

In Florida, what document must be filed with the water management district upon completion of a well?

  1. A drilling permit application
  2. A well completion report Correct answer.
  3. A water quality analysis
  4. A contractor's affidavit

Explanation

Florida law requires that a well completion report be filed with the appropriate water management district upon completion of the well. This report includes details about the well's construction, depth, casing, and other relevant information.

Question 16Drilling, casing, screens and sanitary barriers

What is the primary purpose of grouting the annular space around a well casing in Florida?

  1. To increase the well's water yield
  2. To prevent surface water contamination from entering the aquifer Correct answer.
  3. To make the well easier to abandon later
  4. To reduce drilling costs

Explanation

Grouting the annular space (the gap between the well casing and the borehole wall) is critical for preventing surface water, contaminants, and non-potable water from migrating along the outside of the casing into the aquifer. Florida's construction standards require proper grouting to protect groundwater quality.

Question 17Drilling, casing, screens and sanitary barriers

What drilling method uses compressed air to remove cuttings from the borehole?

  1. Mud rotary drilling
  2. Cable tool drilling
  3. Air rotary drilling Correct answer.
  4. Jetting

Explanation

Air rotary drilling uses compressed air circulated down through the drill string and back up the annular space to remove cuttings from the borehole. This method is effective in consolidated formations and provides a cleaner borehole compared to mud rotary methods, though it is not suitable for all formations.

Question 18Drilling, casing, screens and sanitary barriers

What is the purpose of a well cap or sanitary seal on a Florida water well?

  1. To increase water pressure
  2. To prevent insects, debris, and surface water from entering the well Correct answer.
  3. To regulate water flow
  4. To connect the pump to the electrical system

Explanation

A well cap or sanitary seal is installed on top of the well casing to prevent insects, small animals, debris, and surface water from entering the well. This is a critical component for maintaining the sanitary integrity of the water supply and is required under Florida well construction standards.

Question 19Florida aquifers and interpretable well performance

What is the Floridan Aquifer System?

  1. A surface water reservoir system
  2. A major carbonate aquifer system underlying all of Florida Correct answer.
  3. A network of man-made recharge basins
  4. A coastal saltwater intrusion zone

Explanation

The Floridan Aquifer System is one of the most productive aquifer systems in the world. It is a major carbonate (limestone and dolomite) aquifer system that underlies all of Florida and extends into adjacent states. It serves as the primary source of drinking water for much of the state.

Question 20Florida aquifers and interpretable well performance

What is the primary concern with drilling wells near Florida's coastline?

  1. Sandy soils make drilling difficult
  2. Saltwater intrusion into freshwater aquifers Correct answer.
  3. There is no groundwater near the coast
  4. Coastal regulations prohibit all wells

Explanation

Saltwater intrusion is the primary concern when drilling wells near Florida's coastline. Over-pumping of freshwater wells near the coast can draw saltwater from the ocean into freshwater aquifers, degrading the water quality. Wells in coastal areas require careful design and monitoring to prevent contamination.

Question 21Florida aquifers and interpretable well performance

What is the surficial aquifer system in Florida?

  1. The deepest aquifer in the state
  2. A shallow, unconfined aquifer near the land surface Correct answer.
  3. An aquifer found only in the Florida Keys
  4. A confined artesian aquifer

Explanation

The surficial aquifer system is a shallow, unconfined aquifer near the land surface in Florida. It consists primarily of sand, shell, and limestone deposits and is the water table aquifer. While it provides water for some uses, it is more susceptible to contamination from surface activities than the deeper Floridan Aquifer.

Question 22Pump selection, system head and controlled troubleshooting

What determines the appropriate size of a submersible pump for a residential well in Florida?

  1. The diameter of the well casing only
  2. The depth of the well only
  3. The required flow rate, total dynamic head, and well casing diameter Correct answer.
  4. The brand of the pump

Explanation

Proper pump sizing for a residential well depends on several factors: the required flow rate (gallons per minute needed by the household), the total dynamic head (which includes well depth, drawdown, friction losses, and system pressure), and the well casing diameter (which determines the maximum pump diameter that will fit).

Question 23Pump selection, system head and controlled troubleshooting

What is total dynamic head (TDH) in pump sizing?

  1. The diameter of the pump impeller
  2. The total of all pressure losses the pump must overcome, including static lift, friction loss, and system pressure Correct answer.
  3. The weight of the pump
  4. The electrical voltage required by the pump

Explanation

Total dynamic head (TDH) is the sum of all pressure losses that a pump must overcome to deliver water at the desired flow rate. It includes static head (vertical lift from pumping water level to delivery point), friction losses in piping, and system pressure requirements. Calculating TDH accurately is essential for selecting the correct pump.

Question 24Pump selection, system head and controlled troubleshooting

What is the purpose of a pressure tank in a residential well water system?

  1. To heat the water
  2. To maintain system pressure and reduce pump cycling Correct answer.
  3. To filter sediment from the water
  4. To store chemicals for water treatment

Explanation

A pressure tank maintains system pressure and stores pressurized water so that the pump does not have to run every time a faucet is opened. This reduces pump cycling (frequent on/off), extends pump life, and provides immediate water pressure to the household.

Question 25Safe rig operations, water quality and professional decisions

What is the main hazard associated with drilling into a confined aquifer under artesian pressure in Florida?

  1. The drill bit will break
  2. Uncontrolled water flow that can cause flooding and erosion Correct answer.
  3. The well will not produce water
  4. The casing will melt

Explanation

When drilling into a confined aquifer under artesian pressure, the main hazard is an uncontrolled flow of water to the surface. Flowing artesian wells can cause flooding, erosion of the drill site, damage to equipment, waste of water resources, and environmental damage. Drillers must be prepared with flow-control equipment before penetrating artesian zones.

Question 26Safe rig operations, water quality and professional decisions

A Florida well driller discovers a sinkhole during drilling operations. What is the FIRST action the driller should take?

  1. Continue drilling through the sinkhole
  2. Stop drilling immediately and secure the site Correct answer.
  3. Fill the sinkhole with concrete
  4. Ignore it and move the rig

Explanation

If a sinkhole is encountered during drilling, the driller must immediately stop drilling and secure the site to prevent injury and further ground collapse. Sinkholes indicate a direct connection between the surface and the aquifer, posing serious contamination risks. The driller should then notify the appropriate authorities and follow protocols for well abandonment if necessary.

Question 27Safe rig operations, water quality and professional decisions

What should a well driller do if they encounter unexpected contamination during drilling?

  1. Continue drilling past the contamination zone
  2. Stop drilling, secure the well, and notify the appropriate water management district Correct answer.
  3. Ignore it and complete the well as planned
  4. Pour bleach down the hole and continue

Explanation

If a driller encounters unexpected contamination (such as unusual colors, odors, or known contaminants), they should stop drilling, secure the well to prevent further contamination spread, and notify the appropriate water management district. The well may need to be abandoned or special construction techniques employed under district guidance.

Question 28Drilling, casing, screens and sanitary barriers

What must a Florida well driller do when encountering flowing artesian conditions?

  1. Abandon the well immediately
  2. Control the flow and install appropriate casing and flow-control equipment Correct answer.
  3. Report it to the local fire department
  4. Continue drilling deeper to reduce pressure

Explanation

When a flowing artesian condition is encountered in Florida, the driller must control the flow and install appropriate casing and flow-control equipment (such as shut-off valves or flow restrictors) to prevent uncontrolled discharge of water. Uncontrolled artesian flow can waste water resources, cause erosion, and is a regulatory violation.

Question 29Drilling, casing, screens and sanitary barriers

What is the purpose of well development after drilling in Florida?

  1. To test the pump before installation
  2. To remove drilling fluids and fines from the well to maximize yield Correct answer.
  3. To deepen the well to reach more water
  4. To add gravel to the annular space

Explanation

Well development is the process of removing drilling fluids, cuttings, and fine particles from the well and surrounding formation after construction. This process clears the water-bearing formation around the well screen, improves hydraulic connection, and maximizes the well's yield and water quality.

Question 30Drilling, casing, screens and sanitary barriers

What is the primary function of a well screen in water well construction?

  1. To filter out all bacteria
  2. To allow water to enter the well while keeping sand and sediment out Correct answer.
  3. To strengthen the well casing
  4. To prevent the well from collapsing

Explanation

A well screen is installed at the water-bearing zone to allow water to flow into the well while preventing sand, sediment, and other formation materials from entering. The screen slot size is selected based on the grain size of the formation to optimize water entry and minimize sand production.

Question 31Drilling, casing, screens and sanitary barriers

What is the drilling technique called 'jetting' used for in Florida?

  1. Drilling deep wells into limestone formations
  2. Constructing shallow wells in sandy or soft unconsolidated formations using water pressure Correct answer.
  3. Cleaning and developing existing wells
  4. Testing the yield of completed wells

Explanation

Jetting (also called wash boring or hydraulic jetting) uses a stream of high-pressure water to cut through soft, unconsolidated formations such as sand and shell. This technique is commonly used in Florida for constructing shallow wells in the surficial aquifer. It is relatively simple and cost-effective for small-diameter wells in soft formations.

Question 32Drilling, casing, screens and sanitary barriers

What is the proper procedure for abandoning a well in Florida?

  1. Simply cap the well and walk away
  2. Fill the well with soil and debris
  3. Properly seal the well with grout from bottom to top according to state and district requirements Correct answer.
  4. Remove the casing and leave the hole open

Explanation

Florida requires that abandoned wells be properly sealed by filling them with grout (typically neat cement or bentonite) from the bottom to the top to prevent surface contamination from entering the aquifer. An abandonment permit must be obtained, and a completion report must be filed with the water management district.

Question 33Drilling, casing, screens and sanitary barriers

What is the purpose of a gravel pack around a well screen?

  1. To strengthen the casing
  2. To filter out fine sand and silt particles while allowing water to pass through Correct answer.
  3. To add minerals to the water
  4. To prevent the well from freezing

Explanation

A gravel pack (also called a filter pack) consists of selected gravel or sand placed around the well screen. It filters out fine formation particles that would otherwise pass through the screen, prevents sand pumping, and increases the effective diameter of the well, which improves yield. The gravel size is matched to the formation grain size.

Question 34Drilling, casing, screens and sanitary barriers

What is a 'tremie pipe' used for in well construction?

  1. Pumping water from the well
  2. Placing grout at the bottom of the annular space Correct answer.
  3. Measuring water levels
  4. Connecting the pump to the pressure tank

Explanation

A tremie pipe is a small-diameter pipe used to place grout at the bottom of the annular space and pump it upward (bottom-up grouting). This method ensures that the grout fills the annular space completely without air pockets or bridging, providing a continuous seal from the bottom of the casing to the surface.

Question 35Drilling, casing, screens and sanitary barriers

What is the purpose of conducting a pump test on a newly completed well?

  1. To check the pump motor warranty
  2. To determine the well's yield, drawdown, and recovery characteristics Correct answer.
  3. To verify the well depth measurement
  4. To test the chlorination system

Explanation

A pump test (also called an aquifer test) is conducted on a newly completed well to determine its yield (flow rate), drawdown at various pumping rates, and recovery characteristics after pumping stops. This data is essential for proper pump selection and ensures the well can meet the intended water demand.

Question 36Drilling, casing, screens and sanitary barriers

What is a 'dual-zone' well completion in Florida?

  1. A well with two pumps
  2. A well that draws water from two separate aquifer zones through separate casings and screens Correct answer.
  3. A well that produces both hot and cold water
  4. A well drilled in two phases

Explanation

The listed concept uses separate completion components to address different water-bearing intervals. Actual multi-zone construction must prevent unacceptable interconnection and meet the approved design and authority requirements. This description is not permission to connect aquifers or a universal named Florida completion standard.

Question 37Drilling, casing, screens and sanitary barriers

What is the purpose of a conductor casing in well construction?

  1. To conduct electricity to the pump
  2. To stabilize the upper portion of the borehole in unstable formations Correct answer.
  3. To guide the drill bit
  4. To measure water levels

Explanation

A conductor casing is a temporary or permanent large-diameter casing installed in the upper portion of the borehole to stabilize unconsolidated or caving formations near the surface. It prevents collapse of the borehole wall during drilling and allows the driller to continue drilling safely to the target depth.

Question 38Drilling, casing, screens and sanitary barriers

What is 'mud rotary' drilling?

  1. Drilling using a rotating bit with drilling mud (fluid) circulated to remove cuttings and stabilize the borehole Correct answer.
  2. Drilling through muddy soil without fluid
  3. A method of mixing cement grout
  4. A technique for cleaning wells

Explanation

Mud rotary drilling uses a rotating drill bit while circulating drilling mud (a mixture of water and bentonite or other additives) down through the drill string and back up the annular space. The drilling mud removes cuttings, stabilizes the borehole wall, cools the bit, and provides hydrostatic pressure to prevent formation collapse.

Question 39Drilling, casing, screens and sanitary barriers

What is the function of drilling mud (bentonite slurry) in rotary drilling?

  1. To lubricate the pump motor
  2. To carry cuttings to the surface, cool the drill bit, and stabilize the borehole Correct answer.
  3. To disinfect the well
  4. To increase the water yield

Explanation

Drilling mud (bentonite slurry) serves multiple critical functions: it carries drill cuttings to the surface for removal, cools and lubricates the drill bit, stabilizes the borehole wall by forming a filter cake, and provides hydrostatic pressure to prevent formation fluids from entering the borehole during drilling.

Question 40Drilling, casing, screens and sanitary barriers

What is the primary purpose of a well log in Florida?

  1. To record the contractor's daily work hours
  2. To create a permanent record of the well's construction details, geology encountered, and completion specifications Correct answer.
  3. To track the contractor's continuing education
  4. To calculate the contractor's fees

Explanation

A well log (also called a driller's log or well completion report) creates a permanent record of the well's construction details including depth, casing specifications, grouting, geology encountered during drilling, water levels, well yield, and completion specifications. This record is required by Florida law and is filed with the water management district.

Question 41Drilling, casing, screens and sanitary barriers

What is the recommended procedure for storing PVC well casing on a job site?

  1. Leave it on the ground exposed to sunlight
  2. Store it elevated off the ground, covered, and away from heat sources Correct answer.
  3. Store it submerged in water
  4. No special storage is needed

Explanation

Protect stored casing from contamination, unsuitable heat, damaging exposure and mechanical distortion according to the actual product instructions. Suitable support and covering can help. PVC does not become unusable after every brief exposure, and no universal storage-duration limit is supplied.

Question 42Drilling, casing, screens and sanitary barriers

What is the contractor's obligation regarding an 'incomplete well' (dry hole) in Florida?

  1. Leave the hole open for future use
  2. Properly abandon and seal the well according to state regulations Correct answer.
  3. Cover it with a board and walk away
  4. Fill it with soil only

Explanation

An incomplete or unused borehole must receive the safe, compliant disposition required for its actual construction and condition. Follow the approved Florida authority’s abandonment or completion method, not an improvised surface cover or one universal grout recipe.

Question 43Drilling, casing, screens and sanitary barriers

A homeowner complains of sand in their well water. What is the most likely cause?

  1. The pump is too deep
  2. A corroded or improperly sized well screen allowing sand to enter the well Correct answer.
  3. The water table is rising
  4. Too much chlorine in the water

Explanation

A damaged or unsuitable screen is a plausible listed cause of sediment entry. Formation conditions, filter-pack design, incomplete development, operating rate and structural changes can also matter. Investigate the actual source before assuming one repair will solve every sand problem.

Question 44Florida aquifers and interpretable well performance

What is the intermediate aquifer system in Florida?

  1. An aquifer found between the surficial and Floridan aquifer systems Correct answer.
  2. The same as the Floridan Aquifer
  3. A temporary water-bearing zone
  4. An aquifer used only for injection wells

Explanation

The intermediate aquifer system lies between the surficial aquifer system and the Floridan Aquifer System. It consists of various permeable limestone, sand, and shell beds interbedded with confining clay and marl layers. It is an important water source in parts of southwest Florida.

Question 45Florida aquifers and interpretable well performance

Which of the following best describes an artesian well in Florida?

  1. A well that uses a pump to bring water to the surface
  2. A well where water rises above the top of the aquifer due to natural pressure Correct answer.
  3. A well drilled into unconsolidated sand
  4. A well that only produces saltwater

Explanation

An artesian well is one that taps into a confined aquifer where the water is under pressure. The water rises above the top of the aquifer (and sometimes above ground level as a flowing artesian well) due to the natural hydrostatic pressure. Florida has many artesian wells, particularly those tapping the Floridan Aquifer System.

Question 46Florida aquifers and interpretable well performance

Which listed long-term water-level pattern warrants investigation for pumping-related aquifer stress, while not proving over-pumping without recharge, nearby-use and measurement information?

  1. Increased water clarity
  2. Declining static water level over time Correct answer.
  3. The pump runs less frequently
  4. Higher water pressure at the faucet

Explanation

A declining recovered static level can signal aquifer stress and warrants investigation. It can also reflect seasonal recharge, drought, regional pumping or measurement differences. Evaluate a consistent monitoring record rather than attribute every decline to one cause.

Question 47Florida aquifers and interpretable well performance

What does 'specific capacity' of a well refer to?

  1. The total volume of water in the well casing
  2. The yield of the well per unit of drawdown, typically expressed in GPM per foot Correct answer.
  3. The diameter of the well bore
  4. The depth of the well below ground surface

Explanation

Specific capacity is the yield of a well (in gallons per minute) divided by the drawdown (in feet) at that pumping rate. It is expressed as GPM per foot of drawdown and is a measure of the well's productivity and the aquifer's ability to transmit water to the well.

Question 48Florida aquifers and interpretable well performance

What type of formation makes up most of Florida's primary drinking water aquifer?

  1. Granite
  2. Sandstone
  3. Limestone and dolomite (carbonate rock) Correct answer.
  4. Basalt

Explanation

Florida's primary drinking water source, the Floridan Aquifer System, is composed primarily of limestone and dolomite (carbonate rock). These carbonate formations are highly permeable due to dissolution cavities and fractures, making them excellent aquifers but also susceptible to contamination through sinkholes and solution channels.

Question 49Florida aquifers and interpretable well performance

What is 'drawdown' in the context of water wells?

  1. The process of pulling the pump out of the well
  2. The difference between the static water level and the pumping water level Correct answer.
  3. The reduction in well depth over time
  4. The slope of the ground around the well

Explanation

Drawdown is the difference between the static (non-pumping) water level and the pumping water level in a well. When a pump operates, it lowers the water level in the well; this decrease is the drawdown. Excessive drawdown indicates that the pump capacity exceeds the well's ability to deliver water.

Question 50Florida aquifers and interpretable well performance

In a supplied simplified layered-aquifer model, which listed formation restricts movement between aquifers, with the word impermeable treated as an idealization of low permeability?

  1. A zone of permeable rock that yields water
  2. A layer of impermeable material that restricts water movement between aquifers Correct answer.
  3. A man-made barrier around a well
  4. A zone where water is pumped into the ground

Explanation

A confining unit restricts groundwater movement relative to adjacent aquifers. Natural clay, marl or other confining materials can still transmit some water, especially through fractures or over time. Perfect impermeability is an idealization, not a universal field property.