I am building a French drain that will dump into a catch basin with a sumpump which will discharge about 51 feet away.
Once the trench is graded I’ll lay down none woven fabric in it and then a bed of stone and then the pipe and then more stone.

About 15 feet before my catch basin I have run into two pipe(circles in red in picture) that send water to my garage, there’s also a third pipe running along side the trench (blue and red lines in picture.
I cannot add more slope because those pipe runs through my trench.

I was wondering if anyone has any idea how I could keep the water flowing down without me disturbing those pipes.

I was kinda thinking maybe a catch basin to lift the water up a few inches higher and send it back out to a trench that’s higher up but keep grading down to the catch basin with the sumpump.

Any help is appreciated.