I tried to post this picture last night but it was too slow. I'm using an old laptop and it is doing fine.
I put the knee pads on and crawled under the west side of the porch. I took a flashlight so I could find the faucet for the west porch. I found it and turned it on. When I managed to get back out from under the house, water was pouring down. I thought that maybe I'd left the faucet on the porch on so I walked bent over to get out from under the porch, around the house, up onto the porch...no water.
So then I had to go back under the house to turn the faucet off. I couldn't tell what was leaking (gushing), but I think it is going to require a plumber.