Water Reticulation Design

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Water Reticulation Design

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Title:

INTRODUCTION

WATER RETICULATION DESIGNThis design is using Hazen William formula is given by

V=0.8492CR^0.63*S^0.54 (SI units)

V= velocity in m/s

R= hydraulic radius in m

C= Hazen-William roughness coefficient

S=slope of energy grade line (head loss per unit lenght of conduit)

SUMMARY WATER RETICULATION DATANo of pipes 22no.s

No of nodes 23no.s

Tapping point at node 1

The network analysis was carried out using Aquator software. The input data are all in SI unit.Using the software, the nodes are created and pipes are interconnected among the nodes.(refer Figure given). The lengths, diameter, roughness are then assigned to these pipes. Secondly the offtakes at nodes in liter per second are extracted from the nodes. After that,the fixed grade /s (i.e the safe pressure at tapping points) is assigned.The data are then analysed and checked against the design criteria. Where necessary, the pipes diameter is carried out until the design criteria are met or close to the requirement depending on case by case situation.

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INTRODUCTION

WATER RETICULATION DESIGNThis design is using Hazen William formula is given by

V=0.8492CR^0.63*S^0.54 (SI units)

V= velocity in m/s

R= hydraulic radius in m

C= Hazen-William roughness coefficient

S=slope of energy grade line (head loss per unit lenght of conduit)

SUMMARY WATER RETICULATION DATA22no.s

23no.s

1

The data are then analysed and checked against the design criteria. Where necessary, the pipes diameter is carried out until the design

Copyright © 2009/2013 CSSS. All rights reserved.

Schematic layout

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Case:AVERAGE FLOW Design factor=1

Node Flow Elev HGL HSL Residual Pressure

No l/s m m m m

1 -38.913 29.25 49.25 0 20

2 0 32.25 49.214 0 16.964

3 0 32.25 49.03 0 16.78

4 0 32.25 48.661 0 16.411

5 0 32.25 48.138 0 15.888

6 0 32.25 47.595 0 15.345

7 0 32.25 46.789 0 14.539

8 0 32.25 46.651 0 14.401

9 18.939 32.25 46.64 0 14.39

10 0 32.25 46.705 0 14.455

11 18.939 32.25 46.486 0 14.236

12 0 32.25 49.029 0 16.779

13 0 32.25 49.027 0 16.777

14 0 32.25 49.025 0 16.775

15 0 32.25 49.021 0 16.771

16 0 32.25 49.01 0 16.76

17 0 32.25 49 0 16.75

18 0 32.25 48.985 0 16.735

19 0 32.25 48.983 0 16.733

20 0 32.25 48.982 0 16.732

21 0.82 32.25 48.982 38.25 10.732

22 0.21 32.25 48.984 38.25 10.734

23 0.005 32.25 49.01 40.25 8.76Copyright © 2009/2014 CSSS. All rights reserved.

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Case:AVERAGE FLOW Design factor=1

Residual Pressure

m

20

16.964

16.78

16.411

15.888

15.345

14.539

14.401

14.39

14.455

14.236

16.779

16.777

16.775

16.771

16.76

16.75

16.735

16.733

16.732

10.732

10.734

8.76Copyright © 2009/2014 CSSS. All rights reserved.

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Case:AVERAGE FLOW Design factor=1

Pipe From To Length Dia HWC HL HL/1000 Velocity

No Node Node m mm m m/s

1 1 2 0.682 150 100 0.04 0.05 2.20

2 2 3 3.456 150 100 0.18 0.05 2.20

3 3 4 7.274 150 100 0.37 0.05 2.14

4 4 5 10.329 150 100 0.52 0.05 2.14

5 5 6 10.73 150 100 0.54 0.05 2.14

6 6 7 57.399 150 100 0.81 0.01 1.07

7 7 8 9.878 150 100 0.14 0.01 1.07

8 8 9 0.766 150 100 0.01 0.01 1.07

9 6 10 63.438 150 100 0.89 0.01 1.07

10 10 11 15.611 150 100 0.22 0.01 1.07

11 3 12 0.902 100 120 0.00 0.00 0.13

12 12 13 6.026 100 120 0.00 0.00 0.13

13 13 14 8.524 100 120 0.00 0.00 0.13

14 14 15 10.73 100 120 0.00 0.00 0.13

15 15 16 32.917 100 120 0.01 0.00 0.13

16 16 17 29.717 100 120 0.01 0.00 0.13

17 17 18 48.144 100 120 0.02 0.00 0.13

18 18 19 8.666 100 120 0.00 0.00 0.10

19 19 20 4.523 100 120 0.00 0.00 0.10

20 20 21 1.743 150 100 0.00 0.00 0.05

21 18 22 5.16 100 120 0.00 0.00 0.03

22 16 23 12.593 25 120 0.00 0.00 0.01

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Case:AVERAGE FLOW Design factor=1

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Case:PEAK FLOW Design factor=2.5

Node Flow Elev HGL HSL Residual Pressure

No l/s m m m m

1 -2.588 29.25 49.25 0 20

2 0 32.25 49.25 0 17

3 0 32.25 49.249 0 16.999

4 0 32.25 49.249 0 16.999

5 0 32.25 49.249 0 16.999

6 0 32.25 49.249 0 16.999

7 0 32.25 49.249 0 16.999

8 0 32.25 49.249 0 16.999

9 0 32.25 49.249 0 16.999

10 0 32.25 49.249 0 16.999

11 0 32.25 49.249 0 16.999

12 0 32.25 49.247 0 16.997

13 0 32.25 49.236 0 16.986

14 0 32.25 49.221 0 16.971

15 0 32.25 49.201 0 16.951

16 0 32.25 49.142 0 16.892

17 0 32.25 49.088 0 16.838

18 0 32.25 49.002 0 16.752

19 0 32.25 48.992 0 16.742

20 0 32.25 48.987 0 16.737

21 2.05 32.25 48.986 38.25 10.736

22 0.525 32.25 49.002 38.25 10.752

23 0.012 32.25 49.141 40.25 8.891Copyright © 2009/2014 CSSS. All rights reserved.

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Case:PEAK FLOW Design factor=2.5

Residual Pressure

m

20

17

16.999

16.999

16.999

16.999

16.999

16.999

16.999

16.999

16.999

16.997

16.986

16.971

16.951

16.892

16.838

16.752

16.742

16.737

10.736

10.752

8.891Copyright © 2009/2014 CSSS. All rights reserved.

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Case:PEAK FLOW Design factor=2.5

Pipe From To Length Dia HWC HL HL/1000 Velocity

No Node Node m mm m m/s

1 1 2 0.682 150 100 0.00 0.00 0.15

2 2 3 3.456 150 100 0.00 0.00 0.15

3 3 4 7.274 150 100 0.00 0.00 0.00

4 4 5 10.329 150 100 0.00 0.00 0.00

5 5 6 10.73 150 100 0.00 0.00 0.00

6 6 7 57.399 150 100 0.00 0.00 0.00

7 7 8 9.878 150 100 0.00 0.00 0.00

8 8 9 0.766 150 100 0.00 0.00 0.00

9 6 10 63.438 150 100 0.00 0.00 0.00

10 10 11 15.611 150 100 0.00 0.00 0.00

11 3 12 0.902 100 120 0.00 0.00 0.33

12 12 13 6.026 100 120 0.01 0.00 0.33

13 13 14 8.524 100 120 0.02 0.00 0.33

14 14 15 10.73 100 120 0.02 0.00 0.33

15 15 16 32.917 100 120 0.06 0.00 0.33

16 16 17 29.717 100 120 0.05 0.00 0.33

17 17 18 48.144 100 120 0.09 0.00 0.33

18 18 19 8.666 100 120 0.01 0.00 0.26

19 19 20 4.523 100 120 0.01 0.00 0.26

20 20 21 1.743 150 100 0.00 0.00 0.12

21 18 22 5.16 100 120 0.00 0.00 0.07

22 16 23 12.593 25 120 0.00 0.00 0.03

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Case:PEAK FLOW Design factor=2.5

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