Let me answer this question, but there are several assumptions: (1) Water pipe pressure means that the water pipe is closed; (2) ignoring the resistance loss of water in the flow process; (3) The flow rate of water is constant; (4) When water flows, that is, when the valve is opened, the pressure of water can be completely converted into kinetic energy.

(1) According to Bernoulli equation, under the arithmetic square root, v= 2gh and h = 25m.

，v = 22. 14m/s

(2) Assuming that the water conveyance pipe is galvanized welded steel pipe, the outer diameter of the steel pipe with DN 100 is 1 14.3mm, the wall thickness is 4.0mm, and the inner diameter is114.3-8 =100.

(3) According to the flow formula Q = A× V = (π/4 )× D× V = (π/4 )× 0.1063× 0.1063× 22.14 = 0./kloc-.

It shows that solving this problem is a bit far-fetched. And Baidu's solution can't be drawn, and the formula editor can't be used. The problem is neither fish nor fowl, just give you a solution for reference.