I asked ChatGpt for Manhole design approach and it said
"The design approach for a manhole depends on its depth, loading conditions, and soil characteristics. It can be treated as either a cantilever wall or a box structure,
Which Method to Use?
For shallow manholes (up to ~3m depth) →...
Embankment slope is made to 18.43 degree, ordinary slope protrudes from the edge but this one is made to stabilize load from the slope. how do we set the slope? here is a picture.