Water Design is a PC-based software tool sufficient for developing many aspects of water-pinch analysis and synthesis covered in Chaps. 1 to 7 of Industrial Water Reuse and Wastewater Minimization (Mann, J. G. and Y. A. Liu, McGraw-Hill, 1999).
You may need to install the Visual Basic 6 run-time files if you receive an error stating that COMDLG32.OCX or another file is missing when you try to run Water Design. The installation for these files is found on the Microsoft support webpage. Look for the link to download VBRun60.exe.

Figure 1a. Constructing the concentration-composite curve (steps 1 and 2).

Figure 1b. Constructing the concentration-composite curve (step 3).

Figure 1c. Constructing the concentration-composite curve (step 4) and water-supply
line.

Figure 1d. Water Design gives the concentration-composite curve (red)
and apparent water-supply line (blue) for Example 1.

Figure 1e. Water Design displays an optimum water-using network. The
blue lines represent freshwater. The green lines display water reuse. The red
lines show effluent streams. The box display: (1) the operation specifications
of water-using operation 2; (2) its reuse (water source) from other operations;
and (3) its reuse (its effluent being reused) by other operations.

Figure 3a. Process changes to increase water reuse in Example 1.

Figure 6. Concentration-composite curve (red) and apparent water-supply line
(blue) for XX Petrochemicals without flow rate changes.

Figure 7. Initial water-using network synthesized by Water Design
for XX Petrochemicals without flow rate changes.