CH Conservation & Sustainability 2

Question 1

Which hydrographic survey practice best minimizes disturbance to benthic habitat during nearshore surveys?

Accepted Answer

Using multibeam sonar from a vessel with minimal draft

Answer

Multibeam sonar from a shallow-draft vessel allows accurate nearshore mapping without physical contact with the seabed.

Question 2

What is the primary purpose of establishing minimum flow requirements (environmental flows) in a river system?

Accepted Answer

To sustain aquatic ecosystems and downstream water users

Answer

Environmental flow requirements define the minimum streamflow needed to maintain ecological function and support downstream users.

Question 3

A hydrographer discovers elevated turbidity downstream of a construction site. Which sustainable management action is most appropriate?

Accepted Answer

Notify regulatory authorities and recommend erosion controls at the source

Answer

Reporting to regulators and recommending source controls (silt fences, sediment basins) addresses the root cause rather than symptoms.

Question 4

Which metric is most commonly used to assess the long-term sustainability of a groundwater aquifer?

Accepted Answer

Ratio of annual recharge to annual extraction

Answer

Comparing annual recharge to extraction rates determines whether an aquifer is being used sustainably or depleted over time.

Question 5

What role does hydrographic data play in coastal resilience planning?

Accepted Answer

It provides bathymetric and current data needed to model storm surge and flood risk

Answer

Accurate bathymetric and hydrodynamic data underpin storm surge models, informing infrastructure and land-use decisions that build coastal resilience.

(CH) Certified Hydrographer Practice Test

(CH) Certified Hydrographer Practice Test

CH Conservation & Sustainability 2