I am building a floor to house the water cistern, future electrical power generator, and propane gas tank in the far back corner of my house. The main water line comes from the front of the house and I'll need to tap it for the cistern. The most pressure is about 65 PSI. I am thinking of digging a trench along and close to my wall to all the way back, which is about 90 feet.
I want to maintain 3/4 inch inner diameter for my water lines. I was thinking of using Schedule 40 PVC tubing for the water line and return. I know cooper is better but it would be way too expensive. I need to add another pipe for the electrical for the future generator and power for the water pump. Not sure how thick that pipe would need to be. I guess I have no choice to use cooper for the gas line.
I want to do the trench, water pipes, and leave the electrical pipe in the ground for the electrician. Maybe leave a rope in the electrical pipe to save the electrician some time.
I live in the Caribbean so there is no real winter. Can I dig a trench and put the water pipe in, water line return, electrical pipe, and gas line in the same trench? How deep and and wide should I dig my trench? What other types of tubing would you recommend that isn't too costly but durable?