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帆船航行在茫茫大海上,经常会遇到大风浪或暴风雨,这时大量雨水或海水会经甲板上的采光、透气格栅流入船体。船首因为破海时受到海浪冲击或起锚时锚缆带水,也会有不少海水涌入。而一些较大的帆船上常饲养家禽、甚至猪羊,它们的排泄物也会和溅入的海水一起流入底舱。此外,船上一般船员的厕所通常位于船艏露天处,暴风雨天气时,不会有人愿意爬上去,于是就在船舱内各行方便。之后,顶多提桶海水冲洗甲板,部分污水也会流人底舱。凡此种种,总会使底舱积留大量污水。底舱是储藏食物与淡水的地
Sailing in the vast sea, often encounter big storms or storms, then a lot of rain or sea water will be deck, lighting grille into the hull. Because of the impact of sea waves when breaking the sea or anchoring the anchor with water, there will be a lot of seawater influx. In some larger sailing vessels, poultry and even pigs and sheep are often kept, and their excrement will also flow into the bottom tank together with the splashing seawater. In addition, toilets for general crew members on board ships are usually located in the open air at the bow of the boat. No one is willing to climb up in stormy weather so they are conveniently located in the cabin. After that, at most the pail of sea water rinse the deck, and some of the sewage will flow to the bottom of the tank. All these kinds of things will always leave a large amount of sewage in the bottom tank. The bottom compartment is where food and fresh water are stored