Using Darcy's Apparatus Figure 3, Plate 24?

Question

Darcy's Law
The length between the two manometers is .25m The inside diameter of the pipe is 2m. The top manometer is reading 50 inches of water. The bottom manometer is reading 025 inches of water. The outlet is producing 1 m3 of water over 5 min. The test temperature is 70 degrees Fahrenheit. Sand pack measures 30 inches in height. What is the permeability of the sand pack?

Answer 1

What page and what book??

Darcy Law:

Flow = K [permeability] * S [section] * (H1 - H2)/L

data:
L = ,25 m

S = Pi * 2*2/4 ~ Pi = 3,14 m²

Flow = Outlet = 1 m³/5 min = 3,333 litres/sec
H1 - H2 = 50 in - 25 in = 25 in = 25 * 2,54/100m = 63,5 cm = 0,635 m

K = 3,333/[(3,14*0,635)/,25]

K ~0,4177

Answer 2

Gosh, I took Hydrology but I forgot the formula for Darcy's Law. Sorry.