This is in Eastern Washington State. In the Kittitas County area. Some parts of this area are heavy agriculture growing areas... hay and wheat in some parts, vegetables/salad stuff in others, fruit trees and vineyards in others. Geographically a very large county.
There is KRD water which is basically like "blue valve" water, irrigation water that comes from irrigation distribution ditches. Domestic water, with limited field/garden/orchard watering comes from wells. They are all metered (or soon will be) by state order. Well water can be used for household water use and for irrigating up to 2 acres of lawn, garden, orchard, vineyards, etc. Not much agriculture-wise. Any bigger agriculture use has to come from the irrigation ditch water, UNLESS you have "senior" water rights deeded to your property.
In this particular land case, water would come from a well, there is no stream or creek for surface water (which wouldn't belong to the owner anyway, unless deeded to the land years ago).
I don't know how the "5 gpm" is figured, whether averaged out over time or a max draw per actual minute (how would that be measured?). My understanding is that property owners with the metered wells have to report to the state their water usage (I believe monthly, I could be wrong). 7000 gallons a day would more than likely meet my needs. There is not any KRD irrigation ditch water associated with this land.
I was just curious how normal that was for a pumping rate for wells (high, low, average). One or more large water storage tanks certainly would be in order. I am not sure a property owner can capture the rainwater off the roofs on his property in that area. The surface water "belongs" to the KRD, unless your property had (senior) deeded water rights before the KRD was formed.
Water is certainly getting to be a precious commodity.
Note: "The Kittitas Reclamation District is located in Central Washington in the Kittitas Valley. Here are some brief KRD facts: Approximately two thirds of all the irrigated acres in Kittitas County, approximately 60,000 acres, are serviced by the KRD's 330 miles of canals and laterals. It is the 6th largest irrigation district in Washington State."