A related question is here: Buried hose through PVC to outdoor hose bibb
Should I route 5/8" garden hoses, or 3/4"?
We're trying a new watering set up this year. I've collected about a dozen garden hoses, mostly 5/8" ID but some 3/4" ID.
For a long length of garden hose, there is nearly no difference in flow rate:
5 gallon bucket fill times:
a) 76 seconds, for 75' 3/4" ID with cutoff male end b) 80 seconds, for 80' 5/8" ID terminated with a $1.50 plastic inline valve c) 71 seconds, for 2' 5/8" ID with cutoff male end
other 5-gal fill times:
d) 82 seconds, same as (b) but with plastic fan sprayer e) 81 seconds, same as (b) but with plastic quick connect stop with male stub f) 102 seconds, same as (b) extended with ~30' of 3/8" ID rubber air hose.
Accuracy is probably +-2 seconds
Our only pattern of use will be one outlet at a time.
The idea is to route garden hoses to various locations in the yard to supply fixed spigots with attached quick connects. Watering will be done by turning on the house faucet, then using a short length of 3/8" ID rubber air hose carried from spigot to spigot as needed, then turning off the house faucet. The hoses will be buried in the duff, or under a few inches in the dirt. A short length of garden hose from an outside faucet will supply a nearby manifold which will in turn supply the various buried hoses.
We're not concerned about draining for winter freezes. We've had one hose attached continuously for 8 years without a freeze problem. Our outside faucets are the $5 kind and we don't insulate them in the winter.
We're not worried about rodents chewing the hoses.
From the measurements of flow rates, for example (a) versus (b), it seems not to matter which hose ID's I choose to bury, and the connectors and cutoffs don't matter either. I also have a long roll of 3/4" polyethelene I could use.
Is there something I am not considering in choosing 5/8" hoses over 3/4" hoses or the 3/4" polyethylene?