46 CFR § 170.300 - Special consideration for free surface of spoil in hopper dredge hoppers.

---
identifier: "/us/cfr/t46/s170.300"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 170.300 - Special consideration for free surface of spoil in hopper dredge hoppers."
title_number: 46
title_name: "Shipping"
section_number: "170.300"
section_name: "Special consideration for free surface of spoil in hopper dredge hoppers."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "S"
subchapter_name: "SUBDIVISION AND STABILITY"
part_number: "170"
part_name: "STABILITY REQUIREMENTS FOR ALL INSPECTED VESSELS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "43 U.S.C. 1333; 46 U.S.C. 2103, 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "CGD 79-023, 48 FR 51010, Nov. 4, 1983, unless otherwise noted."
cfr_part: "170"
---


# 170.300 Special consideration for free surface of spoil in hopper dredge hoppers.

The calculations required by this subchapter for each self-propelled hopper dredge must include—

(a) The free surface effect of consumable liquids and the free surface effect of the dredged spoil in the hoppers; and

(b) Either of the following assumptions when performing the calculations required by § 174.310(b) of this chapter:

(1) If the dredged spoil is assumed to be jettisoned, the free surface of the dredged spoil may be disregarded.

(2) If the dredged spoil is not assumed to be jettisoned. the free surface of the dredged spoil must be calculated.

[CGD 76-080, 54 FR 36977, Sept. 6, 1989]