Mike,
Sorry for the delay, consulting clients full of emergencies this week. Interesting questions, I'll do my best to answer.
In this process you're going from conceptual "I want a pool" through the many concepts that will work for your back yard to select a concept that you like based on your criteria. That's usually a list like:
- What fits
- What are my personal preferences
- What rules do I have to comply with (local requirements for construction, set backs, HOA rules)
- What can I afford
- What will make wife and family happy
Once you select a concept from sketches like the ones you attached you'll need to start real design work. There's a certain amount of detail that you need to ensure the pool will work and to construct it. Most of the time some of this must be submitted to your local building department and sometimes there are additional documents. For example, you'll definitely need hydraulic calcs to size plumbing, equipment etc. And your building department will want to look at these. But they'll also want to see how you are going to comply with their requirement to implement child barriers. There are several ways to do this but they're not required to build the pool.
So at the end of the day the level of detail is driven mostly by what's needed for construction and to satisfy the permitting process in your local area. You can't build the pool using subs with the detail level in examples you show. But you can select style, location and what's affordable. To build it using subs you need at least:
- Site drawing/survey showing location, dimensions, drainage plan(elevations) and proving you're within the setbacks.
- Underground piping and electrical
- Structural layout that shows where the rebar goes, how thick the concrete is, where the penetrations are for plumbing, drains, returns, lights and other fixtures
- Hydraulic calculations, operating points
- Electrical design details like load list, location of sub panel, bond system design, sufficient calcs to show you comply with code
- Construction details to show things that are required to build like how you overlap rebar, position and install fittings (like skimmers, drains, light fittings, returns, spa jets etc), pipe and electrical. There are a LOT of section drawings that show constructors how to do everything from corners to light fixtures.
- Some details are left to the constructors but not much. Mostly this is things like the brand of pipe fittings that are sometimes slightly different. Some of this I don't like for example they will often permit bell end pipe or couplers and some allow buried bond clamps that are not really designed to be buried.
- You'll also need a complete set of specs for the grade of rebar, strength of concrete, rebar schedule, applicable codes etc.
- Stamped structural drawings for all structural components.
- Equipment list and pad location (usually shown on the plan view or piping layout)
Some of your required detail is a matter of how much risk you want to take. For example, my rear setback line only gives me about 1.5' of clearance from back of pool. I should be able to just measure back from the house survey but I didn't want to take a chance on this so I had the surveyor stake a like on the lot that showed exactly where the setback line was.
I hope this is helpful and please feel free to ask follow ups if needed.
Chris