Consumption Analysis Model

Analysis of components of consumption forms an important part of any loss reduction or conservation program. The following model is a simple model made in a spreadsheet to predict industrial restroom usage for industries with many employees. This type of model may be used to see the potential benefit of toilet changeout for water conservation or it may be used to predict the amount of water used for sanitary purposes so that it may be broken out of a measured flow profile.

Table 10.11 shows an input table with estimations for volumetric use and frequency of use for men and women within various different buildings within a fictitious industry.

Figure 10.9 shows a resultant modeled estimation of sanitary use per shift.

Building Total Population Distribution

Men flush

2

Urinal flush

2

Key

Total volume per person

Women flush

4

Urinal volume

1

Blue user enter

Volume flush

3.5

Red calculated

Volume wash

1

Black description

Bldg. 1

414

Flushes

Volume/ flush

Vol/ person

No flushes

Vol/ person

Vol/ person

No washes

Volume/ wash

Vol/ person

Men

207

2

S.5

7

2

1

2

4

1

4

1S

Women

207

4

S.5

14

0

4

1

4

18

50/50

Bldg. 2

65

Men

S6

2

S.5

7

2

1

2

4

1

4

1S

Women

29

4

S.5

14

0

4

1

4

18

55/45

Bldg. 3

40

Men

20

2

S.5

7

2

1

2

4

1

4

1S

Women

20

4

S.5

14

0

4

1

4

18

50/50

Bldg. 4

200

Men

120

2

S.5

7

2

1

2

4

1

4

1S

Women

80

4

S.5

14

0

4

1

4

18

60/40

Source: Water Loss Control Manual, 1st ed.

Table 10.11 Input Table with Estimations for Volumetric Use

Source: Water Loss Control Manual, 1st ed.

Table 10.11 Input Table with Estimations for Volumetric Use

Building Total Population Distribution

Men flush

2

Urinal flush

2

Key

Total volume per person

Women flush

4

Urinal volume

1

Blue user enter

Volume flush

3.5

Red calculated

Volume wash

1

Black description

Bldg. 5

270

Men

1e2

2

3.5

7

2

1

2

4

1

4

13

Women

108

4

3.5

14

0

4

1

4

18

60/40

Bld. 6

33

Men

20

2

3.5

7

2

1

2

4

1

4

13

Women

13

4

3.5

14

0

4

1

4

18

60/40

Source: Water Loss Control Manual, 1st ed.

Table 10.11 Input Table with Estimations for Volumetric Use (Continued)

Source: Water Loss Control Manual, 1st ed.

Table 10.11 Input Table with Estimations for Volumetric Use (Continued)

Modeled Sanitary Use

Modeled Sanitary Use

Figure 10.9 Resultant modeled estimation of sanitary use per shift (Source: Water Loss Control Manual, 1st Edition.)

Table 10.12 shows our input table again with the volume per flush changed to reflect change out to a lower volume flush toilet, in this case the volume reduced from 3.5 gal per flush to 1.6 gal per flush. (Excellent base information on usage can be found in the AWWA end-user survey and in the U.K. managing leakage series).

Figure 10.10 shows the resultant modeled reduction in use per shift.

Modeled Sanitary Use

Modeled Sanitary Use

Figure 10.10 Resultant modeled reduction in use per shift (Source: Water Loss Control Manual, 1st ed.)

Building Total Population Distribution

Men flush

2

Urinal flush

2

Key

Total volume per person

Women flush

4

Urinal volume

1

Blue user enter

Volume flush

1.6

Red calculated

Volume wash

1

Black description

Bldg. 1

414

No flushes

Volume/ flush

Vol/ person

No flushes

Vol/ person

Vol/ person

No washes

Volume/ wash

Vol/ person

Men

207

2

1.6

3.2

2

1

2

4

1

4

9.2

Women

207

4

1.6

6.4

0

4

1

4

10.4

50/50

Bldg. 2

65

Men

36

2

1.6

3.2

2

1

2

4

1

4

9.2

Women

29

4

1.6

6.4

0

4

1

4

10.4

55/45

Bldg. 3

40

Men

20

2

1.6

3.2

2

1

2

4

1

4

9.2

Women

20

4

1.6

6.4

0

4

1

4

10.4

50/50

Bldg. 4

200

Men

120

2

1.6

3.2

2

1

2

4

1

4

9.2

Women

80

4

1.6

6.4

0

4

1

4

10.4

60/40

Bldg. 5

270

2

1.6

3.2

2

1

2

4

1

4

9.2

Men

162

4

1.6

6.4

0

4

1

4

18

Women

108

60/40

Bld. 6

33

Men

20

2

1.6

3.2

2

1

2

4

1

4

13

Women

13

4

1.6

6.4

0

4

1

4

18

60/40

Source: Water Loss Control Manual, 1st Edition

Table 10.12 Flush Volume Changed to Reflect Conservation.

Source: Water Loss Control Manual, 1st Edition

Table 10.12 Flush Volume Changed to Reflect Conservation.

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