Chapter 9.5, Problem 10E

Exercises 8-14 involve the information in Figure 9.114 on installing a drip irrigation system.

How many workers would it take to finish the installation within that completion time?

Task	Length	Dependencies
a. Determine water needs of plants	$3\text{hours}$
b Lay out system	$1\text{hour}$	a
c. Determine length of tubing needed	$15\text{minutes}$	a, b
d. Determine number and type of emitters needed	$15\text{minutes}$	a, b
e. Determine location of control panel	$15\text{minutes}$
f. Determine number of separately controlled lines	$15\text{minutes}$	a, b, d
g. Buy emitters, tubing, valves, control panel, wire	$1\text{hour}$	a, b, d, e, f
h. Get wire from control panel to valves	$3\text{hours}$	e, f, g
i. Put tubing in place	$1\text{hour}$	b, c, f, g
j. Cut tubing	$30\text{minutes}$	g, i
k. Connect cut sections of tubing	$30\text{minutes}$	g, j
l. Install emitters	$1\text{hour}$	d, g, i, j, k
m. Test system	$15\text{minutes}$	k, l

Figure 9.114 Installing a drip irrigation system.