Q2 (40 pts): Consider the water distribution network shown in the figure below and the different
water demands assigned to each node given in the accompanying table. Assume all nodes have the
same elevation.
Part A: Use the Darcy-Weisbach method to determine the discharge in each PVC ("smooth")
pipe and the pressure head at each node. An example calculation for each step is required, but
you can show the convergence of your solutions by presenting only the tables (from Excel) for
each iteration. Please ensure your tables are legible, easy to follow, and organized. Submit the
Excel file as part of your .zip folder.
Part B: Solve the problem using EPANET. How do the results compare to your hand
calculations? Please include a screenshot of your final results in the EPANET (i.e., showing
flows and pressures) model to accompany your discussion. Submit the EPANET model as
part of your .zip folder.
Part C: Assume the total demand at node E is now 0.6 cfs and that the required minimum
nodal pressure is 75 psi. Use EPANET to redesign the system by changing the diameter of one
pipe and provide a brief justification for your choice. Note: only replace one pipe at a time. Do
not replace multiple segments.
Please include a screenshot of your final results in the EPANET (i.e., showing flows and
pressures) model to accompany your discussion. Submit the EPANET model as part of your
.zip folder.
1000 ft
12 in
Water Users
C
Industrial
Commercial
Commercial
Residential
Residential
Residential
Commercial
Fire flow demand
1250 ft
12 in.
1000 ft
8 in
1050 ft
8 in.
1100 ft
8 in.
Figure 2: Diagram of the water distribution network, including the lengths and diameters of the
pipes.
12 in.
1250 ft
Table 1: Water demands for nodes in the water distribution network.
6.77 acres
2.90 acres
2.90 acres
E
12 in.
600 ft
120 persons
502 persons
598 persons
3.30 acres
Area or population Max. daily unit
served
consumption
21,000 gal/acre/day
45,000 gal/acre/day
45,000 gal/acre/day
270 gal/person/day
270 gal/person/day
270 gal/person/day
45,000 gal/acre/day
0.94 cfs
Connecting Node
B
E
E
D
D
F
D
