Legal Question in Real Estate Law in California

I used to have a nearly identical situation: a shared well that was capable of about 5 gpm, and a vacant property that was later built upon as the sharing neighbor. The well was physically on the neighbor's property and we had an easement agreement. The easement agreement spelled out how the water was prioritized and shared. Is there a recorded agreement covering this well? Here are some technical thoughts: (1) Some counties have minimum flow requirements for residential wells--in my (former) county, you needed 1.0 gpm in order to get a building permit, as I recall. (2) Well tests not only determine peak flow, they also (usually) will report for how long the peak flow can be maintained. There's a huge difference between 6 gpm for 15 minutes and 6 gpm for 12 hours! (3) Is the water-production capability related to the well itself, or to the pump? (Many well tests use the tester's portable pump, which may be more or possibly less productive than the well itself or the well's own pump). (4) Remember that well water often, perhaps generally, is stored and re-delivered to the home by a domestic pump, not the well pump, so storage capacity buffers well-delivery capacity, and there are 1,440 minutes in a day, suggesting that a storage tank holding several thousand gallons might need to be part of your system. (5), are you planning on doing agriculture, or will the water be used only for household purposes? That may be decisive in whether the water supply is adequate as a practical matter. Finally (6), what is the outlook for getting additional water from a new well on the property that isn't shared? Ask a local driller for a guesstimate of cost and likely production.