The drains under the basement floor, that drain ground water to my sump pump keep filling up with sand. I broke up some of the floor and found the tile was broke in several spots. I would like to know how to replace it and what to use. How much gravel should I put around the tile? How deep and wide should the trench be?

I'm confused. Your drain lines drain water from where? You speak of broken Terra-Cotta pipes but refer back to a trench and a french drain. Where's the trench at? Tom

I may have used the wrong terminology. When digging for a basement do they not dig trenches, put in pea stone, or some gravel to filter the water that enters the drain pipes. These pipes lead to a sump where a sump-punp, pumps it outside. How deep and how wide should the trench be? How much pea stone, or gravel should be around the pipe?
What kind of pipe and stone?

the drains under the basement floor, that drain ground water to my sump pump keep filling up with sand. I broke up some of the floor and found the tile was broke in several spots. I would like to know how to replace it and what to use. How much gravel should I put around the tile? How deep and wide should the trench be?
How much pea stone