CH Regulatory Framework & Compliance 2

Question 1

Under the Rivers and Harbors Act of 1899, which federal agency has primary authority over navigable waterway obstructions?

Accepted Answer

U.S. Army Corps of Engineers

Answer

The Rivers and Harbors Act grants the U.S. Army Corps of Engineers permitting authority over structures and work in navigable waters.

Question 2

Which IHO publication sets the minimum standards for hydrographic surveys used in nautical charting?

Accepted Answer

IHO S-44

Answer

IHO S-44 (Standards for Hydrographic Surveys) defines accuracy, coverage, and data quality requirements for surveys supporting nautical charts.

Question 3

A hydrographer discovers a submerged obstruction not shown on current charts during a survey. What is the immediate regulatory obligation?

Accepted Answer

Report to NOAA and the U.S. Coast Guard via a Notice to Mariners

Answer

Hazards to navigation must be promptly reported to NOAA and the Coast Guard so a Notice to Mariners can be issued to alert mariners.

Question 4

The Clean Water Act Section 404 program primarily regulates hydrographic activities related to:

Accepted Answer

Discharge of dredged or fill material into waters of the United States

Answer

Section 404 requires permits from the Army Corps of Engineers for discharging dredged or fill material into navigable waters and wetlands.

Question 5

What does 'Special Order' survey accuracy (IHO S-44) specifically require regarding full seafloor coverage?

Accepted Answer

100% bottom coverage is mandatory using multi-beam or side-scan sonar

Answer

IHO Special Order demands 100% seafloor coverage to detect all features in safety-critical areas such as harbors and channels.

(CH) Certified Hydrographer Practice Test