Landscape Architect Registration Exam — Questions and Answers

Question 1: What does 'distribution uniformity' (DU) measure in an irrigation system?

How evenly water is applied across all parts of an irrigated area (Correct answer)
The uniformity of operating pressure throughout the system
The consistency of pipe diameters used in the design
The equal spacing of heads across a zone layout

Correct answer: How evenly water is applied across all parts of an irrigated area

Distribution uniformity quantifies how evenly water is distributed across an irrigated area; a higher DU means more consistent coverage and less over- or under-watering of any given spot.

Question 2: Which document establishes the official start of the contractor's time to complete the project?

Mobilization authorization
Contract execution date
Notice of award
Notice to proceed (Correct answer)

Correct answer: Notice to proceed

The notice to proceed (NTP) is the owner's written authorization for the contractor to begin work and typically marks day one of the contract duration.

Question 3: On a grading plan, what does a dashed contour line typically indicate?

Drainage swales
Underground utilities
Existing grade contours (Correct answer)
Proposed grade contours

Correct answer: Existing grade contours

Dashed contour lines on grading plans conventionally represent existing grade conditions before construction.

Question 4: Which LARE section focuses on grading, drainage, and construction documentation?

Section C
Section B (Correct answer)
Section D
Section A

Correct answer: Section B

Section B of the LARE specifically covers grading, drainage, and construction documentation skills.

Question 5: During site inventory, a landscape architect identifies a historic stone wall along the property boundary. Under the Secretary of the Interior's Standards, the preferred treatment to maintain its significance is:

Preservation in place with minimal intervention (Correct answer)
Restoration removing all non-historic additions
Rehabilitation allowing compatible new uses while preserving historic character
Reconstruction using new materials to match the original appearance

Correct answer: Preservation in place with minimal intervention

The Standards' Preservation treatment calls for stabilizing and maintaining existing historic materials with the least intervention, ideal when the resource is intact.

Question 6: What is 'soil compaction' in landscape construction, and what is its primary negative effect on plants?

The intentional mixing of compost into subsoil to improve nutrient levels
The breakdown of soil aggregates due to repeated freeze-thaw cycles
The reduction of soil pore space due to pressure, which limits water infiltration and root penetration (Correct answer)
The natural settling of imported fill material over time after installation

Correct answer: The reduction of soil pore space due to pressure, which limits water infiltration and root penetration

Compaction reduces the macro-pore spaces between soil particles, limiting water infiltration, gas exchange, and root elongation, ultimately stunting plant growth and causing premature decline.

Question 7: A landscape architect wants to include a requirement that the contractor provide a 2-year plant establishment warranty. In which section of the project manual should this requirement appear?

Division 00 — Procurement and Contracting Requirements
Division 01 — General Requirements (Summary of Work)
Division 32 — Exterior Improvements (Planting specification) (Correct answer)
Division 31 — Earthwork

Correct answer: Division 32 — Exterior Improvements (Planting specification)

Warranty requirements specific to planted material should be included in Division 32 planting specifications where they are linked to the specific material performance requirements and installation standards.

Question 8: When a landscape architect is comparing bids, one bid is significantly lower than all others. The best practice is to:

Reject the low bid as non-responsive and award to the second-lowest bidder
Investigate the low bid for potential errors or missing scope before recommending award (Correct answer)
Award immediately to capture cost savings for the owner
Require the low bidder to increase their bid bond before award

Correct answer: Investigate the low bid for potential errors or missing scope before recommending award

A significantly low bid should be analyzed to determine whether it reflects an error, omitted scope, or a genuine competitive advantage before recommending award.

Question 9: In designing a grass-lined swale for a new park, the landscape architect specifies a series of check dams. What is the principal reason for including check dams in this context?

To create a series of deep ponds for aquatic life.
To increase water velocity and flush sediments.
To serve as the primary sediment trapping device for the entire site.
To reduce the velocity of water flow, preventing channel erosion and promoting infiltration. (Correct answer)

Correct answer: To reduce the velocity of water flow, preventing channel erosion and promoting infiltration.

Check dams are small barriers constructed across a swale or drainage ditch. Their primary function is to interrupt and slow the flow of water. By reducing the velocity, they flatten the hydraulic gradient, which minimizes the erosive force of the water on the channel itself and allows for some infiltration into the soil. While some sediment may settle behind them, their main purpose is erosion control through velocity reduction, not large-scale sediment capture.

Question 10: A landscape contractor wants to substitute a nursery stock species not listed in the specifications. Under standard AIA contract conditions, who must approve the substitution?

The landscape architect (Correct answer)
The owner only
The local planning department
The contractor's plant supplier

Correct answer: The landscape architect

Substitutions require the landscape architect's written approval, as the design professional is responsible for ensuring the substitution meets design intent and specification requirements.

Question 11: What is 'allelopathy' and how does it affect planting design?

A method of spacing plants to reduce disease
A soil amendment strategy that improves plant uptake
The use of companion planting to attract pollinators
The release of chemicals by a plant that inhibit growth of nearby plants (Correct answer)

Correct answer: The release of chemicals by a plant that inhibit growth of nearby plants

Allelopathy occurs when a plant releases biochemicals that suppress the germination or growth of neighboring plants, which must be accounted for in planting plans.

Question 12: Which stormwater BMP is specifically designed to treat road runoff containing high concentrations of heavy metals and petroleum hydrocarbons?

Bioretention cell with amended soil media (Correct answer)
Constructed wetland
Dry extended detention basin
Vegetated filter strip

Correct answer: Bioretention cell with amended soil media

Bioretention cells with engineered soil media are particularly effective at removing heavy metals and hydrocarbons through adsorption and biological uptake.

Question 13: During earthwork, a contractor encounters soil with a swell factor of 25%. If 800 bank cubic yards (BCY) are excavated, how many loose cubic yards (LCY) must be hauled away?

640 LCY
1,000 LCY (Correct answer)
800 LCY
1,200 LCY

Correct answer: 1,000 LCY

Loose volume = Bank volume × (1 + swell factor) = 800 × 1.25 = 1,000 LCY; swell increases volume when soil is excavated and loosened.

Question 14: The K-factor in the Universal Soil Loss Equation (USLE) represents:

Crop management and vegetative cover factor
Rainfall erosivity index
Soil erodibility based on texture, structure, and organic matter (Correct answer)
Slope length and steepness

Correct answer: Soil erodibility based on texture, structure, and organic matter

The K-factor quantifies how susceptible a soil is to detachment and transport by rainfall and runoff, based on its physical and chemical properties.

Question 15: Which of the following best describes the stewardship responsibility of a landscape architect when historic cultural landscapes are involved?

Document, preserve, and sensitively adapt historic elements while meeting contemporary needs (Correct answer)
Demolish all existing features and start fresh
Prioritize new programming over any historic fabric
Replicate the landscape exactly using modern materials

Correct answer: Document, preserve, and sensitively adapt historic elements while meeting contemporary needs

Stewardship of cultural landscapes requires documenting and preserving historic character while thoughtfully integrating contemporary uses.

Question 16: Which site analysis factor most directly determines the feasibility of on-site septic system installation?

Aspect orientation
Slope percentage
Depth to bedrock
Soil percolation rate (Correct answer)

Correct answer: Soil percolation rate

Soil percolation rate determines how quickly water drains through soil, which is the primary criterion for septic system feasibility and sizing.

Question 17: A landscape architect notices during a site observation that the contractor has installed plant materials that do not match the specifications. The appropriate first step is to:

Revise the specifications to match what was installed
Order the contractor to immediately remove the plants at their expense
Issue a written Field Observation Report documenting the non-conforming work (Correct answer)
Contact the owner directly and advise them to terminate the contractor

Correct answer: Issue a written Field Observation Report documenting the non-conforming work

The proper first step is to document the non-conforming work in a written Field Observation Report, which creates the official record for subsequent action.

Question 18: A landscape architect is designing a rain garden on a residential lot with silty clay soils. Which modification is most appropriate to improve performance?

Reduce the drainage area to less than 50 square feet
Increase ponding depth to 24 inches
Amend native soil with compost and sand to improve infiltration (Correct answer)
Use a solid bottom liner to prevent seepage

Correct answer: Amend native soil with compost and sand to improve infiltration

Amending heavy clay soils with compost and sand increases infiltration rates, which is essential for rain garden function.

Question 19: During the warranty period, a large tree installed by the contractor dies due to drought conditions. The contractor argues the death is due to owner negligence in watering. The owner says the contractor failed to install a root ball of specified size. Who has initial responsibility for proving the cause?

The party making the claim (contractor or owner, depending on who seeks relief) (Correct answer)
The local municipality that approved the planting plan
The nursery supplier who provided the tree
The landscape architect, as the neutral party

Correct answer: The party making the claim (contractor or owner, depending on who seeks relief)

In contract disputes, the party seeking relief generally bears the burden of proving their claim; both parties would need documentation of specified root ball size and actual irrigation records.

Question 20: A landscape contractor installs irrigation pipe at 18 inches depth instead of the specified 24 inches in a freeze-prone climate. The landscape architect discovers this during an observation visit. What is the correct course of action?

Recommend a design change to reduce the specification to 18 inches
Accept the work since 18 inches is adequate in most climates
Document the deviation but allow it to avoid disrupting the schedule
Issue a non-conformance notice and require the contractor to reinstall at the specified depth (Correct answer)

Correct answer: Issue a non-conformance notice and require the contractor to reinstall at the specified depth

Non-conforming work that does not meet specifications must be rejected and corrected; in freeze-prone areas, inadequate burial depth will cause pipe damage, creating owner liability.

Question 21: When a landscape architect adds a 'keynote' to a plan, they are:

Highlighting the most important design feature
Assigning a numbered reference that links plan elements to a written legend or specifications (Correct answer)
Noting the contractor's contact information
Calling out the plant common name

Correct answer: Assigning a numbered reference that links plan elements to a written legend or specifications

Keynotes use numbered or lettered callouts on drawings that correspond to descriptions in a separate legend, reducing repetitive notation on plan sheets.

Question 22: What does the term 'soil horizon' refer to in site analysis?

The depth at which bedrock is encountered during boring
A distinct layer of soil with different physical and chemical properties from adjacent layers (Correct answer)
The horizontal extent of a soil type across a site
The maximum depth of a site's seasonal high water table

Correct answer: A distinct layer of soil with different physical and chemical properties from adjacent layers

Soil horizons are distinct horizontal layers within the soil profile (O, A, B, C) that differ in color, texture, structure, and composition.

Question 23: What is the purpose of a payment bond (labor and material bond) on a landscape construction project?

To protect the owner from contractor bankruptcy
To ensure that subcontractors and suppliers are paid (Correct answer)
To guarantee the contractor completes the project
To fund project contingencies when change orders exceed the budget

Correct answer: To ensure that subcontractors and suppliers are paid

A payment bond guarantees that the bonding company will pay subcontractors, laborers, and material suppliers if the general contractor fails to pay them.

Question 24: What is the purpose of specifying 'compaction to 95% Modified Proctor density' in earthwork specifications?

To maximize drainage through the fill layer
To ensure soil fertility for planting
To reduce the volume of imported material needed
To achieve soil strength adequate to support loads without settling (Correct answer)

Correct answer: To achieve soil strength adequate to support loads without settling

Compaction to 95% Modified Proctor density provides the structural integrity needed for fill soils to support pavements and structures without differential settlement.

Question 25: The 'time of concentration' in stormwater hydrology refers to:

The time for a pollutant to reach a concentration limit
The time required for soil to reach saturation
The duration of the design storm event
The time for runoff to travel from the hydraulically farthest point to the outlet (Correct answer)

Correct answer: The time for runoff to travel from the hydraulically farthest point to the outlet

Time of concentration is the travel time of stormwater from the most hydraulically remote point in the watershed to the design outlet.

Question 26: In construction contracts, a percentage of each progress payment is often withheld from the contractor until the end of the project. What is the primary purpose of this practice, known as retainage?

To provide a financial incentive for the contractor to complete the project and correct all deficiencies. (Correct answer)
To serve as the primary source of funding for any change orders during the project.
To create a contingency fund that is returned to the owner if unused.
To pay for the owner's third-party inspection and material testing services.

Correct answer: To provide a financial incentive for the contractor to complete the project and correct all deficiencies.

Retainage is a portion of the payment due to the contractor that is withheld to ensure the project is fully completed according to the contract and that any defects or punch list items are corrected. It serves as a financial incentive and provides the owner with leverage to ensure the contractor fulfills all contractual obligations before receiving the final payment.

Question 27: A landscape architect is preparing a cost estimate at the schematic design phase. Which estimating method is most appropriate at this stage?

Contractor bid comparison
Square footage or parametric estimate (Correct answer)
Detailed quantity survey estimate
Unit price estimate based on material takeoffs

Correct answer: Square footage or parametric estimate

Parametric or square footage estimates are appropriate at schematic design when insufficient design detail exists for unit price or quantity survey approaches.

Question 28: Which soil test result is most useful for determining the appropriate amendments before establishing a native plant restoration on a degraded urban site?

Atterberg limits
Percolation rate only
Proctor compaction test
Soil texture, pH, and organic matter content (Correct answer)

Correct answer: Soil texture, pH, and organic matter content

Texture, pH, and organic matter directly affect nutrient availability and plant establishment, guiding targeted amendments for restoration planting.

Question 29: When developing a plant palette for a public plaza in a high-pedestrian urban environment, which characteristic is LEAST important to prioritize?

Resistance to vandalism and mechanical damage
Salt and compaction tolerance
Seasonal wildlife habitat value (Correct answer)
Fruit or seed messiness

Correct answer: Seasonal wildlife habitat value

In a high-pedestrian urban plaza, wildlife habitat value is less critical than tolerance to urban stresses, maintenance, and safety concerns.

Question 30: Which mapping method provides the most accurate existing tree canopy data for a large urban park site inventory?

Aerial photography interpretation alone
Surveyed dripline measurements of trees over 6-inch DBH only
Ground-level photo inventory
LiDAR remote sensing combined with field verification (Correct answer)

Correct answer: LiDAR remote sensing combined with field verification

LiDAR captures three-dimensional canopy structure with high precision, and field verification confirms species identity and health status.

Question 31: Which soil amendment practice best supports long-term landscape sustainability?

Incorporating compost to improve soil structure, organic matter, and microbial activity (Correct answer)
Annual applications of synthetic nitrogen fertilizers
Sterilizing soil before planting to eliminate pathogens
Replacing topsoil with imported fill every five years

Correct answer: Incorporating compost to improve soil structure, organic matter, and microbial activity

Compost improves soil health holistically by enhancing structure, moisture retention, and the microbial communities that support plant growth.

Question 32: ADA Standards for Accessible Design require that accessible routes have a maximum running slope of:

10% (1:10)
5% (1:20) (Correct answer)
8.33% (1:12)
3% (1:33)

Correct answer: 5% (1:20)

The ADA requires accessible routes to have a running slope no greater than 1:20 (5%); slopes exceeding this must be designed as ramps with handrails.

Question 33: A master plan for a large regional park calls for phased implementation over 15 years due to budget constraints. Which design principle is most essential to ensure a cohesive final result?

Focal Point
Asymmetry
Simplicity
Unity (Correct answer)

Correct answer: Unity

Unity, or the sense of oneness and cohesion, is crucial for a project implemented in phases over a long period. By establishing a strong, unifying design language through the repetition of elements, materials, forms, or a consistent planting palette, the master plan ensures that each implemented phase contributes to a harmonious and complete landscape, rather than becoming a collection of disconnected parts.

Question 34: Which soil pH range is considered optimal for most landscape plants in the US?

4.0–5.0 (strongly acidic)
8.5–9.5 (strongly alkaline)
5.5–7.0 (slightly acidic to neutral) (Correct answer)
7.5–8.5 (moderately alkaline)

Correct answer: 5.5–7.0 (slightly acidic to neutral)

A pH of 5.5–7.0 allows maximum nutrient availability and supports the widest range of landscape plant species in US conditions.

Question 35: When preparing a master plan phasing strategy, which factor should take HIGHEST priority in sequencing construction phases?

Aesthetic appeal of early-phase improvements
Infrastructure installation before dependent amenities (Correct answer)
Completing the largest phase first to demonstrate commitment
Minimizing public visibility of construction activity

Correct answer: Infrastructure installation before dependent amenities

Infrastructure (utilities, grading, stormwater) must precede dependent amenities to avoid costly retrofitting and ensure systems function correctly.

Question 36: Which design parameter is most critical when sizing an infiltration trench to meet groundwater protection requirements?

Surface area of contributing pavement
Depth of the aggregate storage layer
Distance to the seasonal high water table (Correct answer)
Trench length

Correct answer: Distance to the seasonal high water table

Separation from the seasonal high water table is critical to prevent groundwater contamination and ensure adequate treatment depth.

Question 37: A landscape architect is designing a rain garden with a ponding depth of 6 inches. The measured soil infiltration rate is 0.5 inches/hour. Approximately how many hours will it take to drain after a storm?

3 hours
24 hours
12 hours (Correct answer)
6 hours

Correct answer: 12 hours

Dividing the ponding depth (6 inches) by the infiltration rate (0.5 in/hr) gives a drain time of 12 hours.

Question 38: Which bond type protects the owner if the contractor abandons the project or fails to complete it?

Bid bond
Payment bond
Performance bond (Correct answer)
Maintenance bond

Correct answer: Performance bond

A performance bond guarantees that the contractor will complete the work per the contract terms; if the contractor defaults, the surety is obligated to complete the project or compensate the owner.

Question 39: In a watershed with significant agricultural land use, which stormwater pollutant is typically the primary water quality concern?

Trash and debris
Heavy metals
Nutrients (nitrogen and phosphorus) (Correct answer)
Petroleum hydrocarbons

Correct answer: Nutrients (nitrogen and phosphorus)

Agricultural areas are the leading source of nutrient (nitrogen and phosphorus) loading to water bodies through fertilizer and manure runoff, causing eutrophication.

Question 40: When conducting a visual inventory, the term 'borrowed landscape' refers to:

Plantings installed on adjacent property with owner permission
A legally easement-protected scenic corridor
Vegetation temporarily transplanted from an off-site nursery
Distant views incorporated into a site design without owning that land (Correct answer)

Correct answer: Distant views incorporated into a site design without owning that land

Borrowed landscape is a design concept where off-site scenery is framed and integrated into the perceived composition.

Question 41: A landscape architect is reviewing a submittal from a contractor for a custom-designed steel planter. The submittal includes detailed fabrication drawings, material specifications, and finish samples. What is the primary purpose of the landscape architect's review of these shop drawings?

To approve the contractor's choice of material suppliers and fabricators.
To verify the contractor's means and methods of construction.
To check for dimensional accuracy for the purpose of quantity take-offs and payment.
To ensure the proposed planter conforms to the design intent shown in the contract documents. (Correct answer)

Correct answer: To ensure the proposed planter conforms to the design intent shown in the contract documents.

The landscape architect's primary responsibility when reviewing shop drawings is to confirm that the contractor's interpretation of the design, as detailed in their drawings, aligns with the original design intent, performance requirements, and aesthetics specified in the construction documents. The review is not for approving means and methods, which are the contractor's responsibility, nor for selecting suppliers or verifying quantities for payment.

Question 42: A contractor submits a substitution request for a specified plant species. Under AIA contract documents, who has final authority to approve or reject the substitution?

The local building official
The landscape architect (Correct answer)
The owner
The contractor

Correct answer: The landscape architect

The landscape architect, as the design professional of record, has the authority to approve or reject substitutions during construction administration.

Question 43: Which document type establishes the legal relationship between the owner and the general contractor?

Construction drawings
Geotechnical report
Project manual
Agreement (Owner-Contractor contract) (Correct answer)

Correct answer: Agreement (Owner-Contractor contract)

The Agreement, such as AIA A101, is the binding legal contract between owner and contractor; drawings and specifications are incorporated by reference.

Question 44: What is the significance of a 'seasonal high water table' (SHWT) in site and planting design?

It establishes the water supply zone for irrigation system design
It limits the depth for underground utilities and foundation walls
It defines the maximum flood elevation for stormwater detention sizing
It affects plant selection, drainage design, and is often the control elevation for bioretention systems (Correct answer)

Correct answer: It affects plant selection, drainage design, and is often the control elevation for bioretention systems

The SHWT is the highest elevation that groundwater reaches seasonally, and it dictates minimum depths for underground infrastructure, influences plant selection for wet tolerance, and controls bioretention design bottom elevations.

Question 45: A landscape specification requires that sod be watered within 30 minutes of installation. The contractor installs sod in the morning and waters it 2 hours later due to an equipment malfunction. The sod survives. What should the landscape architect document?

A non-conformance with the specification, noting the deviation and the equipment malfunction (Correct answer)
A change order reducing the sod specification to allow 2-hour watering
Nothing, since the sod survived and there was no actual damage
A warranty claim against the contractor for potential future sod failure

Correct answer: A non-conformance with the specification, noting the deviation and the equipment malfunction

Specification deviations must be documented regardless of immediate outcome; the record protects all parties if warranty issues arise later and establishes a pattern if repeated.

Question 46: Which document type in a construction set provides written technical requirements for materials and workmanship?

Grading plan
Detail drawings
Site plan
Specifications (Correct answer)

Correct answer: Specifications

Specifications are written documents that describe the quality, standards, and installation requirements for materials and workmanship.

Question 47: A geotechnical report indicates that a project requires 10,000 cubic yards of compacted fill. The native soil to be used for the fill has a swell factor of 20% when excavated and a shrinkage factor of 10% from its original bank state when compacted. To achieve the required 10,000 cubic yards of compacted fill, approximately how much native soil must be excavated?

10,000 cubic yards
12,500 cubic yards
11,111 cubic yards (Correct answer)
9,000 cubic yards

Correct answer: 11,111 cubic yards

This calculation requires working backward from the final compacted volume to the initial bank volume. The shrinkage factor of 10% means the compacted volume is 90% of the original bank volume. To find the required bank volume, divide the compacted volume by (1 - shrinkage factor): 10,000 CY / (1 - 0.10) = 10,000 / 0.90 = 11,111.11 cubic yards. The swell factor applies to the volume change from bank to loose state and is not needed to answer this specific question.

Question 48: A change order increases the contract sum by $15,000. The contractor's overhead and profit markup allowed by the contract is 15%. What is the contractor's markup on a $15,000 net cost change?

$1,500
$2,000
$2,250 (Correct answer)
$3,000

Correct answer: $2,250

The markup = $15,000 × 0.15 = $2,250; the total change order amount to the owner would be $15,000 + $2,250 = $17,250.

Question 49: What is the primary purpose of a flared end section (FES) at a culvert outlet?

To allow fish passage through the culvert
To reduce outlet velocity and minimize erosion at the discharge point (Correct answer)
To prevent sediment from entering the pipe
To increase pipe capacity by reducing entrance loss

Correct answer: To reduce outlet velocity and minimize erosion at the discharge point

A flared end section spreads and slows the discharge, reducing scour and erosion at the culvert outlet.

Question 50: Which irrigation scheduling approach uses real-time or historical weather data to calculate plant water demand?

Calendar-based scheduling
Evapotranspiration (ET)-based scheduling (Correct answer)
Soil-texture-based scheduling
Fixed-interval scheduling

Correct answer: Evapotranspiration (ET)-based scheduling

ET-based scheduling uses evapotranspiration data derived from weather conditions to precisely calculate how much water the landscape needs, avoiding over- or under-irrigation.

Question 51: Which section of the CSI MasterFormat would contain specifications for concrete unit paving installation?

Division 31 — Earthwork
Division 02 — Existing Conditions
Division 33 — Utilities
Division 32 — Exterior Improvements (Correct answer)

Correct answer: Division 32 — Exterior Improvements

Concrete unit paving (pavers) falls under Division 32, Exterior Improvements, which covers paving, planting, and site furnishings.

Question 52: What is the primary purpose of a check dam installed in a vegetated swale?

To slow flow velocity, promote infiltration, and trap sediment (Correct answer)
To increase hydraulic capacity during large storm events
To redirect flow to an adjacent drainage system
To permanently impound water for habitat creation

Correct answer: To slow flow velocity, promote infiltration, and trap sediment

Check dams slow stormwater velocity in swales, allowing sediment to settle and promoting infiltration between successive pools.

Question 53: During a site inspection, you observe that a sediment basin outlet structure is clogged and water is overtopping the embankment. What is the immediate priority?

Breach the embankment to release water and prevent a catastrophic failure
Install additional silt fence downstream to capture sediment
Clear the outlet structure to restore designed hydraulic function (Correct answer)
Document the failure and schedule repairs for the next maintenance cycle

Correct answer: Clear the outlet structure to restore designed hydraulic function

Clearing the outlet structure is the first priority to restore controlled drainage and prevent the uncontrolled embankment overtopping that could lead to catastrophic failure.

Question 54: Under AIA contract documents, the landscape architect's authority to reject work is most accurately described as:

Professional — the landscape architect can reject work that does not conform to contract documents (Correct answer)
Absolute — the landscape architect can halt all work at any time for any reason
Limited — rejection requires prior owner approval before the contractor is notified
Advisory — rejection is a recommendation only and the owner makes the final decision

Correct answer: Professional — the landscape architect can reject work that does not conform to contract documents

AIA documents grant the architect/landscape architect the authority to reject work that does not conform to the contract documents as part of their design professional role.

Question 55: When construction documents note 'CONC' on a paving plan, it typically refers to:

Construction notes
Concentrated drainage flow
Concrete as a paving material (Correct answer)
Contour numbers

Correct answer: Concrete as a paving material

'CONC' is the standard abbreviation for concrete on construction documents.

Question 56: Which drawing typically shows the horizontal distance between site features and property boundaries?

Elevation drawing
Grading plan
Dimension plan or layout plan (Correct answer)
Planting plan

Correct answer: Dimension plan or layout plan

A dimension plan or layout plan provides precise horizontal measurements locating all site elements relative to property lines, benchmarks, or other reference points.

Question 57: Under a standard AIA contract, who is responsible for coordinating the work of subcontractors?

The project inspector
The owner
The landscape architect
The general contractor (Correct answer)

Correct answer: The general contractor

Under AIA contracts, the general contractor is responsible for coordinating and supervising all subcontractors.

Question 58: Which soil condition is MOST detrimental to newly installed landscape plants during the establishment period?

Moderate clay content providing nutrient retention
Compacted subsoil with poor drainage causing anaerobic conditions (Correct answer)
Low organic matter requiring annual fertilization
Slightly acidic pH between 6.0 and 6.5

Correct answer: Compacted subsoil with poor drainage causing anaerobic conditions

Compacted soils with poor drainage create anaerobic (oxygen-deprived) conditions that suffocate roots and promote root rot, which is the leading cause of plant establishment failure.

Question 59: During a site visit, a landscape architect notices a distinct change in vegetation from upland forest to sedge-dominated wetland. The transition zone between these communities is best described as:

A hydric soil indicator
A riparian corridor
A successional climax community
An ecotone (Correct answer)

Correct answer: An ecotone

An ecotone is the transitional zone between two adjacent ecological communities, often exhibiting high biodiversity from both communities.

Question 60: During construction, the contractor encounters underground utilities not shown on the contract drawings. Under AIA documents, this situation is most likely covered by which clause?

Owner-furnished information disclaimer
Contractor's risk provision
Differing site conditions (Correct answer)
Force majeure

Correct answer: Differing site conditions

The differing site conditions clause protects contractors who encounter concealed physical conditions materially different from those indicated in the contract.

Question 61: In a bioretention cell, what is the primary purpose of the ponding zone?

To accelerate peak discharge to the downstream system
To provide temporary storage for incoming stormwater before it infiltrates (Correct answer)
To permanently retain water for irrigation
To filter sediment using gravel beds

Correct answer: To provide temporary storage for incoming stormwater before it infiltrates

The ponding zone temporarily stores stormwater above the growing media, allowing it to infiltrate gradually.

Question 62: A landscape architect is designing a corporate campus and wants to create a comfortable outdoor plaza for employees. The site analysis reveals that the prevailing summer wind is from the southwest. To mitigate the wind's effect and create a sheltered space, which of the following is the most effective initial design strategy?

Orient the plaza on the northeast side of the main building. (Correct answer)
Install a large, open-bottomed pergola in the center of the plaza.
Use light-colored paving materials to reflect solar radiation.
Specify only low-growing groundcovers and herbaceous perennials.

Correct answer: Orient the plaza on the northeast side of the main building.

Site analysis includes understanding climatic factors like prevailing winds to inform design decisions that enhance human comfort. [2, 9] Placing the plaza on the leeward (northeast) side of a large building will use the structure itself as a windbreak, effectively sheltering the space from the southwesterly winds.

Question 63: A geotechnical report for a project site indicates a high water table and layers of compressible organic soil. Which of the following is the most significant implication for the landscape architect's design?

There will be no restrictions on the placement of heavy site amenities like large fountains or sculptures.
Plant selection will be limited to native species.
The site will have excellent natural drainage for stormwater management.
The project will likely require specialized and costly foundation designs for structures and pavements. (Correct answer)

Correct answer: The project will likely require specialized and costly foundation designs for structures and pavements.

Geotechnical reports provide critical information about subsurface soil and water conditions to ensure structural safety and stability. [1, 5] Compressible organic soils have poor load-bearing capacity, and a high water table can further destabilize them. This combination necessitates specialized foundations (like piles or rafts) for any structures, walls, or pavements to prevent settlement and failure, which significantly impacts the project budget and design. [4, 6]

Question 64: A landscape architect is preparing an inventory of cultural resources on a rural site with potential archaeological sensitivity. The most appropriate baseline document to consult first is:

The National Register of Historic Places listed properties database
USGS topographic quadrangle maps only
The State Historic Preservation Office (SHPO) files and archaeological predictive models (Correct answer)
The county tax assessor's parcel map

Correct answer: The State Historic Preservation Office (SHPO) files and archaeological predictive models

SHPO files contain recorded sites, predictive models, and prior survey reports that establish baseline cultural resource sensitivity before any field investigation.

Question 65: In a master plan cost estimate, which category typically represents the LARGEST share of total project budget for a large urban park?

Site furnishings and signage
Planting and seeding
Soft costs (design fees, permits, testing)
Site preparation and earthwork (Correct answer)

Correct answer: Site preparation and earthwork

Earthwork—grading, excavation, fill, and compaction—is typically the largest single cost line item on large park projects due to equipment and material volumes.

Question 66: Which condition creates a 'surcharged' storm sewer system?

When flow velocity drops below the minimum self-cleaning velocity
When pipes are flowing at less than 50% capacity
When inlets are clogged with debris during a storm
When hydraulic grade line rises above the pipe crown due to downstream backwater (Correct answer)

Correct answer: When hydraulic grade line rises above the pipe crown due to downstream backwater

A surcharged system occurs when the hydraulic grade line exceeds the top of the pipe, causing pipes to flow under pressure rather than as open-channel flow.

Question 67: When establishing grades around a building, a landscape architect designs a minimum 2% slope within 10 feet of the foundation. This is primarily intended to:

Prevent frost heave from damaging the foundation
Provide accessible pedestrian clearance at building entrances
Direct surface runoff away from the structure to prevent water infiltration (Correct answer)
Reduce the visual impact of the building's mass

Correct answer: Direct surface runoff away from the structure to prevent water infiltration

Grading away from foundations at minimum 2% ensures surface water drains away from the building, preventing moisture infiltration into basements and crawl spaces.

Question 68: A site located in USDA Hardiness Zone 7b has a mean annual extreme minimum temperature range of:

-20 degrees F to -15 degrees F
0 degrees F to 5 degrees F
5 degrees F to 10 degrees F (Correct answer)
10 degrees F to 15 degrees F

Correct answer: 5 degrees F to 10 degrees F

Zone 7b corresponds to a mean annual extreme minimum temperature of 5 to 10 degrees F per the USDA Plant Hardiness Zone Map.

Question 69: Which of the following best distinguishes site analysis from site inventory?

Site inventory is the documentation of existing conditions, while site analysis is the interpretation of those conditions to identify opportunities and constraints. (Correct answer)
Site inventory focuses on natural systems, whereas site analysis focuses on cultural and man-made systems.
Site inventory is the process of creating the base map, while site analysis involves adding color and rendering.
Site inventory involves fieldwork, while site analysis is purely office-based work using GIS.

Correct answer: Site inventory is the documentation of existing conditions, while site analysis is the interpretation of those conditions to identify opportunities and constraints.

The core distinction is that site inventory is the data collection phase (listing what exists, e.g., topography, vegetation, utilities), while site analysis is the evaluative phase. [10, 17] Analysis involves synthesizing the inventoried data to understand relationships, identify problems, and find opportunities that will inform the design process. [10, 24]

Question 70: What does 'angle of repose' mean in cut-and-fill grading design?

The maximum safe steepness of a slope for a given soil type before it fails (Correct answer)
The slope of a drainage swale required to prevent sediment deposition
The maximum grade of a wheelchair-accessible ramp under ADA standards
The angle at which a retaining wall must be battered to prevent overturning

Correct answer: The maximum safe steepness of a slope for a given soil type before it fails

The angle of repose is the steepest angle at which a granular or cohesive soil will remain stable without sliding, and varies by soil type, moisture content, and cohesion.

Question 71: A 'transect' in master planning refers to:

A soil profile showing horizons from surface to bedrock
A cross-sectional diagram showing topographic changes
A traffic flow analysis across an intersection
A gradient from rural to urban land use intensities organized into zones (Correct answer)

Correct answer: A gradient from rural to urban land use intensities organized into zones

The rural-to-urban transect, popularized by New Urbanism, organizes land use intensity from natural zones through suburban to urban core zones.

Question 72: What contour interval is most appropriate for detailed grading plans on a residential site with moderate slopes?

10 feet
1 foot (Correct answer)
0.5 feet
5 feet

Correct answer: 1 foot

A 1-foot contour interval provides sufficient detail for residential grading plans with moderate slopes.

Question 73: What is a 'climax community' in the context of landscape succession?

A community dominated by annual wildflowers
The first plants to colonize a disturbed site
A planting design that mimics natural woodland edges
The stable, long-term plant community that develops after succession (Correct answer)

Correct answer: The stable, long-term plant community that develops after succession

A climax community is the stable, self-perpetuating plant community that represents the endpoint of ecological succession in a given region.

Question 74: Which outlet structure configuration best provides both water quality treatment and channel protection for a multi-stage stormwater pond?

Single large orifice at the pond bottom
Perforated pipe underdrain connected directly to the storm sewer
Open weir discharging at the top of the permanent pool
Riser structure with multiple outlets at different elevations controlling different design storms (Correct answer)

Correct answer: Riser structure with multiple outlets at different elevations controlling different design storms

A multi-stage riser with outlets at different elevations independently controls the water quality volume, channel protection volume, and peak flood control storage.

Question 75: A landscape architect is designing a pedestrian plaza using unit pavers. Which specification requirement is MOST important for preventing pavement failure in a cold climate with freeze-thaw cycles?

Paver dimensions and joint width
Paver color and surface texture
Paver manufacturer and country of origin
Paver absorption rate and compressive strength (Correct answer)

Correct answer: Paver absorption rate and compressive strength

In freeze-thaw climates, pavers must have low absorption rates to resist water infiltration and high compressive strength to withstand the pressures of ice expansion cycles.

Question 76: Which element of a solar analysis is most critical when siting a new passive-solar community building on a temperate northern-hemisphere site?

Maximizing roof pitch for solar panel efficiency
Orienting the ridge line north-south
Avoiding east-facing exposures entirely
Maximizing south-facing glass exposure (Correct answer)

Correct answer: Maximizing south-facing glass exposure

South-facing glazing captures low winter sun for passive heating while roof overhangs can shade the same glass in summer.

Question 77: Which soil type is MOST susceptible to liquefaction during seismic activity, posing grading and foundation stability concerns?

Saturated, loose fine sand (Correct answer)
Fractured bedrock
Dense, well-graded gravel
Stiff, overconsolidated clay

Correct answer: Saturated, loose fine sand

Saturated loose fine sands are most susceptible to liquefaction because seismic shaking causes pore water pressure to exceed confining stress, causing the soil to behave like a liquid.

Question 78: Which of the following design interventions in a public plaza most directly promotes the design principle of "prospect and refuge"?

Using permeable pavers throughout the plaza to manage stormwater on-site.
Ensuring all pathways meet ADA standards for width and slope.
Installing a large, open water feature in the center of the plaza.
Providing a variety of seating options, including benches placed under tree canopies and along the edges of planters. (Correct answer)

Correct answer: Providing a variety of seating options, including benches placed under tree canopies and along the edges of planters.

Prospect-refuge theory, proposed by Jay Appleton, suggests that humans are instinctively drawn to environments where they can see their surroundings (prospect) from a position of safety and enclosure (refuge). Providing seating with a protective back, such as against a planter or under a tree, allows a person to feel secure while observing the open activity of the plaza. The other options address accessibility, aesthetics, or environmental function, but not this specific psychological principle of comfort and safety.

Question 79: A contractor's bid is 20% below the engineer's estimate, and all other bids cluster within 5% of each other. What is the most prudent action for the owner's team?

Award to the low bidder immediately because the owner saves money
Investigate the low bid for potential errors or omissions before awarding (Correct answer)
Reject all bids and rebid the project
Award to the second-lowest bidder as the low bid appears unreliable

Correct answer: Investigate the low bid for potential errors or omissions before awarding

An unusually low bid may indicate a mathematical error, omitted scope, or a contractor planning to recover costs through change orders; investigation before award protects the owner.

Question 80: A topographic survey shows closed contour lines with hachure marks on a site. What landform do these lines represent?

A ridge with drainage flowing outward
A depression or closed basin collecting water (Correct answer)
A uniformly sloped hillside
An escarpment or cliff face

Correct answer: A depression or closed basin collecting water

Hachure marks on closed contours indicate a depression where elevation decreases toward the center, unlike a hill where elevation increases.

Landscape Architect Registration Exam

The LARE is a four-section exam administered by CLARB that assesses the knowledge, skills, and abilities required to practice landscape architecture competently without endangering public health, safety, or welfare. Candidates must pass all four sections to qualify for licensure.

Questions

105 min

Time Limit

65%

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