they make irrigation flex pipes at home depot for sixty bucks 100' feet long with a silk mud sleeve. i installed one around my house cause previous fixer up redneck bob backfilled the property and the water would run into my house and on top of my wood floors. Caught it before it busted my floors up. As for around my tank, toast lol. ! When you run the irrigation pipe, remember that it has to be level all the way thru from start to finish it can have a decline from start to finish but if you have any rise it wont work, i know from PERSONAL experience. best if you dig the ditch run a string line level with a liine level and then measure from the string to the surface of the dirt and then lay pipe and bury . google french drains, also add peat gravel or crushed stone. good luck come see my back yard, i put a limestone patio over the pipe.