Sustainability and Environmental Practices
Sustainability questions test whether you can reduce inputs and environmental impact while meeting the program. Know the core ideas: water conservation (native/adapted plants, efficient irrigation, rain harvesting), soil health (compost, avoiding compaction, preserving topsoil), stormwater management (infiltration, bioretention, permeable surfaces), and habitat (native plants, connectivity, avoiding invasives). Understand the waste hierarchy: reduce, reuse, recycle - and specify recycled or local materials where appropriate.
Traps: equating "native" with "no maintenance" or "drought tolerant" with "no water ever"; ignoring that some natives are inappropriate for a given soil or microclimate; and treating permeable pavement as maintenance-free (it clogs). Questions may ask which practice best manages stormwater on a tight clay site - infiltration may be limited, so detention, amended soils, and vegetated swales may be better answers than a dry well.
Know green infrastructure terms: bioswale, rain garden, bioretention, permeable pavement, green roof, rain barrel/cistern, and constructed wetland. Understand the difference between on-site retention/detention and conveyance. Review soil amendment, mulch, and composting as low-input practices, and the role of plant diversity in resilience.
Worked rule of thumb: a rain garden is typically sized to capture runoff from a design storm (commonly the first ~1 in of rainfall) from its contributing area; ponding depth is usually kept shallow (often 6-12 in) and drained within about 24-48 hours to avoid mosquito breeding and plant stress. Verify local guidance.
Review lifecycle thinking: choose durable, low-maintenance materials and consider embodied energy and end-of-life. Questions often test trade-offs, not absolutes.