Sagging Porch Deck? Use Car Jacks to Lift it

How to raise and level a sinking porch deck. my porch deck was really slanting so I
got a couple of car jacks I put them on
blocks and I went up underneath and put
them on the crossbeam for support and I
put one on either end and I jacked them
up until I got just enough angle so that
the rain would flow down a little bit
from the house side to the end of the
porch from side to side on the porch
between the two car jacks I tried to
make it as even as possible