Bill I think you will find the faucet to be around 10 feet lower than the top of the well.
That it a wild guess but I bet I am close.
You more than likely have around a 2 to 3 foot rise in elevation from the faucet to the garden.
These elevations aren't even worth considering only the fact you arent loosing pressure and gaining a wee bit.
Also unless you start putting out a ton of water with a huge drip system you dont need to worry too much about flow.
The gallons per minute and pressure is important.
Look at the price difference between 3/4 and 1 inch pipe.
It isn't enough to amount to a hill of beans in your plans but can play a huge role in water delivery.
Even if you have 3/4 coming from the well and you want to go that 100 feet to the garden use 1 inch it can make a difference.
Here is a myth about smaller pipe.
Smaller pipe does not increase pressure it increases velocity.
Velocity in pipe is your enemy.
What it does is decrease pressure while it is flowing due to friction loss.
The only reason they use it is to save money.
And example of this is my place.
I have about 100 feet or so of 3/4 inch copper line coming from my meter at 50 PSI static water pressure.
My flow rate at the faucet is 10 gallons a minute.
My flow rate at the meter is 23 gallons per minute.
That 3/4 line killed 13 gallons per minute of water delivery due to friction loss.
When I put my sprinkler system in I came directly from the 3/4 line at the meter and jumped up to 1 1/2 pipe from that at the valves I put in one inch pipe.
At no place other than the heads themselves do I have anything smaller than 1 inch.
This in effect killed any friction loss and stopped water hammer.
You might not need that 1 inch now for drip but as you said you want to expand, you might not be able to with 3/4.
I over size wire and pipe for this reason.
Drip isn't too much of a big deal you can get away with a lot.
Buy or find yourself two gauges and use them to calculate your system.
Put one at the water source and one at the end of the line at the garden.
The first reading will be supply pressure and the latter will be residual pressure.
This will tell you exactly how much drip line you can get away with.
Lets say you have 50 PSI at the supply and you put in 100 feet of line and turn it on.
The supply gauge drops to 30 psi and you can get away with 10 PSI on the drip line.
This will tell you that you can put in about 200 more feet of drip line.
The gauge at the other end will give you your friction loss reading.
If it is 25 psi it tells you you have around 5 PSI of friction loss.
This reading will get bigger the closer you put it to the supply side.
When you get to that target point of 10 psi on any zone it is time to start another zone.
No fancy math just two gauges and some common sense.
With your set up now you dont need to worry too much.
Worth
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