Freeboard is a design characteristic of a vessel. For small boats, it is the minimum distance from the top edge of the side of the boat, or gunwale, down to the waterline. The weight of the loaded boat equals the weight of the volume of water it displaces. The boat's weight affects the freeboard because the ...

The main purpose of the calculation is to find the freeboard draught (maximum allowable draught). The rule reference is the International Convention of Load Lines, 1966. The first step in freeboard calculation is deciding the type of freeboard. There are two kinds, Type 'A' and Type 'B' (defined in ICLL Regulation 27). Usually Type 'A' ships ... The spreadsheet image at the left shows the calculation of storm water detention pond volume requirement with Excel formulas using the Rational Hydrograph model. This model is the simplest of the three discussed in this article. SPCC Plan - Calculation Guidance The following example compares two different design criteria: one based on the volume of the tank and one based on precipitation. Scenario: A 20,000-gallon horizontal tank is placed within an engineered secondary containment structure, such as a concrete dike. The tank is 35 feet long by 10 feet in diameter.