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Although It may be allowed, you wont save any money. Being a backflow tester I can promise you that you will pay for it in the test fees, especially if your municipality requires annual test. I would charge double to get into a crawl space.

Only negative to running it full time off the main-line is that if it seeps, leaks, or gets debris in it, it will run forever. Seen many a 1,000 dollar water bill caused by a goofed up fill valve directly tied off the main.

Long time. Ive never seen any just "rot". Mechanical damage to it can neccisitate replacement, or debris lodged inside though.

Most likely faulty solenoids. Move or Replace them with a known good solenoid and retest.

A backflow preventor is required on any Irrigation cross connection to the potable water supply. In addition you need a check valve as to not pressurize the supply your water is coming from.

The above poster is correct you bleed port is either clogged, or misaligned. The 205 valve has a bleed port below the solenoid, that must be aligned with the same port in the casing. It looks terribly like a screw hole, and if you dont oreintate the bonnet correctly the valve will also not...

You need a delay between zones. If your controller doesnt have this feature, skip a zone when wiring them. Aka connect zone one leave two black connect three etc.. Many times when running a well, the zone changes is what causes the problem. When switching from zone one to zone two zone one...

Regardless of who designs your system the only way to know what your meter will flow is via a flow test. Cut into the supply wherever you intend to put the backflow preventer and run water into a known size container (5 gal bucket works good) and calculate how much water your getting for a set...

I would probably just make the pond a seperate valve, and put a manual float in the pond. That would be easiest, and then it would work off your sprinkler timer.

Poor quality heads commonly stick down or only pop up partially. Toro, and Hardie spray heads are two of the most common that have this problem. Generally if the stem of the head will move freely by hand then the head is not sticking, you have a pressure problem. If the pressure issue is...