I had an old home construction book from 1945 that showed what was called a Slush Pit.
Honest, I thought this was a political term until I read about it! The toilet flushes straight into a deep pit with leaky gaps in between the bricks. The leach field is all the surrounding area. It's simple to build but wasn't up to code even then. I've used them in Mexico. When you got to go you use what you got.
Are you sure it is waste, not stormwater? Storm water pipes often carry water down, away from the house.
I had an old home construction book from 1945 that showed what was called a Slush Pit. Honest, I thought this was a political term until I read about it! The toilet flushes straight into a deep pit with leaky gaps in between the bricks. The leach field is all the surrounding area. It's simple to build but wasn't up to code even then. I've used them in Mexico. When you got to go you use what you got.