Howdy...I've been a lurker for a while and now have a dilemma I could use some advice on. I've been asked by a development client to design an irrigation mainline for a new development...69 residential lots on about 45 acres with each lot tapping into this main w/ 1" connections off of the main (as opposed to individual wells on each property). The system will be served by groundwater, so I'm going with a constant pressure system with variable speed well pumps. I've got good groundwater source (12' deep w/ drawdown to about 30' per a local driller). The system is going to be looped and we've made the decision to place 4-5 wells on the system, spread across the system (approx 7000 LF of pipe), to lower pipe size and distribute the supply across the development. The problem I face is the number of wells and matching demand. I've assumed about 12GPM demand for each lot (based on average well production in the area), so worst case scenario, we're talking about 830 GPM usage for all 69 lots total. The local driller I've talked to has recommended 10 HP, 3-phase pumps that are capable of about 180 GPM, hence why we're looking at 4-5 wells. However, not everyone will water at the same time thereby spreading demand. Is sizing the system and pumps based on that worst-case scenario the most prudent/ economical thing to do, or is there another, better way to do it? Disclaimer: I've designed irrigation systems before, however, this is the largest I've done to date. I've talked to some friends locally on the contractor side and they didn't seem too concerned, but I'm still nervous about the size and number of pumps and how that affects my pipe sizing. Clear as mud? Thank you for any advice you all can provide.