How is it best to determine the slope for the bottoms of large sump wells, gutters, and water tanks?
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In the projects I’ve worked on before, the structural floor was given a slope; the bottom surface of the floor remained level, while the elevation of its top surface followed the slope, creating a drainage slope as a result. This meant that the thickness of the floor varied. Another structural engineer on the project suggests that it’s sufficient to level the base slab, and then use fine aggregate concrete to create a slope on top of it. Which of these two is better? There’s also the option of making the entire base plate sloped – is that feasible?
Personally, I think it’s better to create a slope using the surface layer when the slope is gentle; whereas when the slope is steep, it’s better to use the structural layer to create the slope.
Reply to 2# pika24: If the slope is gentle, it’s better to create a slope using the surface layer; if the slope is steep, it’s better to do so using the structural layer. Ultimately, it’s best to follow the design specifications
What was said on the 2nd floor is correct; if the slope is gentle, it’s better to create a slope using the surface layer. If the slope is steep, it is better to create a slope through the structural layer.