Duck boards were usually placed over the sumps but they weren't always too usefull, they barely stopped rthe sump from reaching the soldiers and it wan not at all uncommon to get trench foot.
A duckboard
The sump is a low part, it collects stuff, often water or fuel, so it can be pumped out.
A Sump.
an image of the sun
normally over 10
duckboards were placed over a sump
A duckboard
drainage and duckboards :33<
drainage and duckboards :33<
drainage and duckboards :33<
During World War I, trenches often had a sump to collect water and waste. To manage this, a cover or lid made of wood or metal was typically placed over the sump to prevent debris from falling in and to reduce the risk of disease. This practice helped maintain hygiene in the unsanitary conditions of the trenches, which were often flooded and filled with stagnant water.
In World War I, a sump was used to collect and manage water and other fluids that accumulated in trenches, helping to prevent flooding and maintaining the integrity of the trench system. To cover the sump and facilitate movement, wooden planks or duckboards were typically placed over it. This not only provided a walking surface but also helped to reduce the risk of soldiers slipping in mud or water.
It keeps the water that is pumped out from flowing back into the sump when the pump shuts off. Most sumps discharge several feet above the hole the pump sits in. If there was not a check valve the sump would just refill and pump out the water over and over.
For best drainage results, the sump pump should be placed below the rest of the floor. It should be set up to drain outside the house. The hose should be far enough away from the window that it does not leak back inside.
DP is not actually to do with welding it is a form of NDT which stands for non destructive testing; DP is dye-pen where a white liquid formation is placed over the weld & a normally red enhancer is then placed over the top; this then identifies surface cracks.
A dry sump is not submerged under water as a wet sump is. a dry sump uses a resivoir to hold the oil much like the brake fluid. a wet sump has the oil sump bolted to the bottom of the engine block :D
It is an over heat protection to prevent pump windings from buring out