---
kind: "section"
citation: "46 C.F.R. § 174.310"
title: "46"
number: "174.310"
heading: "General."
url: "https://uscodex.org/cfr/46/174.310"
---

# §174.310. General.

- (a) Each hopper dredge under this subpart must be shown by design calculations based on the assumptions under paragraphs [(b)](#b), [(c)](#c), [(d)](#d), and [(e)](#e) of this section, that it meets—
  - (1) The requirements in §§ [170.170](/cfr/46/170.170.md), [170.173](/cfr/46/170.173.md), and [170.300](/cfr/46/170.300.md) of this chapter in each condition of loading and operation; and
  - (2) The survival conditions of [§ 174.320](/cfr/46/174.320.md) in each condition of loading and operation assuming the character and extent of damage specified in [§ 174.315](/cfr/46/174.315.md).
- (b) The calculations required by [paragraph (a)](#a) of this section must assume:
  - (1) The hoppers are full of seawater;
  - (2) The permeability of flooded spaces is as provided by Table 174.310;
  - (3) The equalization provisions of [§ 174.325](/cfr/46/174.325.md); and
  - (4) The jettisoning provisions of [§ 174.330](/cfr/46/174.330.md).
- (c) The calculations required by this section must take into account a sufficient number of loading conditions to identify the condition in which the vessel is least stable, including, but not limited to, the most severe loading condition, and the:
  - (1) Specific gravity of the dredge spoil, from 1.02 up to and including the maximum required by [paragraph (e)(1)](#e-1) of this section; and
  - (2) Draft, up to and including the draft corresponding to the working freeboard for the full range of trim.
- (d) The calculations required by this section for a dredge with open hoppers may include spillage of spoil from the hopper resulting from changing the angle of heel and trim.
- (e) The following assumptions must be made when doing the calculations required by this section:
  - (1) Dredged spoil in the hopper is a homogeneous liquid with a maximum specific gravity for the areas of operation.
  - (2) When calculating the vessel's righting arm, it is assumed at each angle of heel that the vessel trims free and the trimming moment is zero.

## Notes

### Source

Source: CGD 76-080, 54 FR 36977, Sept. 6, 1989, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 9118, 9119, 9153; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 0170.1. Section 174.180 also issued under sec. 617, Pub. L. 111-281, 124 Stat. 2905.

### Source

Source: CGD 79-023, 48 FR 51048, Nov. 4, 1983, unless otherwise noted.