PDC Sustainable Land Use & Water Management 2

Question 1

In permaculture water management, what does the principle 'slow it, spread it, sink it' primarily aim to achieve?

Accepted Answer

Retain water on the land to recharge groundwater and reduce erosion

Answer

Slowing, spreading, and sinking water keeps it on the land longer, reducing erosion and recharging aquifers.

Question 2

Which swale design feature ensures overflow water is safely discharged without causing erosion?

Accepted Answer

A reinforced spillway or overflow structure at the swale end

Answer

A properly designed spillway channels excess water safely away, protecting the swale structure during heavy rainfall.

Question 3

What is the primary hydrological function of riparian buffer zones in permaculture land design?

Accepted Answer

To filter runoff, stabilize banks, and moderate water temperature in waterways

Answer

Riparian buffers filter sediments and nutrients, prevent bank erosion, and shade streams to maintain aquatic ecosystems.

Question 4

In keyline design, what determines the placement of primary irrigation channels?

Accepted Answer

The keyline contour that runs perpendicular to valley slope change points

Answer

Keyline channels follow the keyline—a contour through the keypoint where valley floor slope transitions—to move water from valleys toward ridges.

Question 5

Which soil texture is MOST prone to compaction and reduced water infiltration in agricultural land use?

Accepted Answer

Heavy clay soil

Answer

Heavy clay soils compact easily under foot or vehicle traffic, drastically reducing pore space and water infiltration rates.

(PDC) Permaculture Design Certification Practice Test