Heads up: There are no amended sections in this chapter.
The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.

User note:

About this chapter: Appendix B provides design nomographs and tables for the design of pressure distribution systems.


TABLE B-1

REQUIRED DISTRIBUTION PIPE DIAMETERS FOR VARIOUS HOLE DIAMETERS, HOLE SPACINGS AND DISTRIBUTION PIPE LENGTHS (SCHEDULE 40 PLASTIC PIPE)

DISTRIBUTION
PIPE LENGTH
(feet)
DISTRIBUTION PIPE DIAMETER (inch)
Hole diameter (inch) 1/4 Hole diameter (inch) 5/16 Hole diameter (inch) 3/8 Hole diameter (inch) 7/16 Hole diameter (inch) 1/2
Hole spacing (feet) Hole spacing (feet) Hole spacing (feet) Hole spacing (feet) Hole spacing (feet)
2 3 4 5 6 7 2 3 4 5 6 7 2 3 4 5 6 7 2 3 4 5 6 7 2 3 4 5 6 7
10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 11/4 1 1 1 1 1
15 1 1 1 1 1 1 1 1 1 1 1 1 11/4 1 1 1 1 1 11/4 11/4 1 1 1 1 11/4 11/4 11/4 1 1 1
20 1 1 1 1 1 1 11/4 1 1 1 1 1 11/4 11/4 1 1 1 1 11/4 11/4 11/4 1 1 1 2 11/2 11/4 11/4 11/4 1
25 11/4 1 1 1 1 1 11/4 11/4 1 1 1 1 11/2 11/4 11/4 11/4 1 1 2 11/2 11/4 11/4 11/4 11/4 2 2 11/2 11/4 11/4 11/4
30 11/4 11/4 1 1 1 1 11/2 11/4 11/4 11/4 1 1 2 11/2 11/2 11/4 11/4 11/4 2 2 11/2 11/4 11/4 11/4 3 2 2 11/2 11/2 11/4
35 11/2 11/4 11/4 1 1 1 2 11/2 11/4 11/4 11/4 1 2 2 11/2 11/4 11/4 11/4 3 2 21/2 11/2 11/2 11/4 3 3 2 2 11/2 11/2
40 11/2 11/4 11/4 11/4 1 1 2 11/2 11/2 11/4 11/4 11/4 3 2 11/2 11/2 11/4 11/4 3 2 2 2 11/2 11/2 3 3 2 2 2 11/2
45 2 11/2 11/4 11/4 1 1 2 2 11/2 11/4 11/4 11/4 3 2 2 11/2 11/2 11/2 3 3 2 2 2 11/2 3 3 3 2 2 2
50 2 11/2 11/4 11/4 11/4 11/4 3 2 2 11/2 11/2 11/4 3 3 2 2 2 11/2 3 3 2 2 2 11/2 3 3 3 3 2 2

For SI:1 inch = 25.4 mm, 1 foot = 304.8 mm.

TABLE B-2a

DISTRIBUTION PIPE DISCHARGE RATE

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 3.785 L/m.

  1. This table, a nomogram, determines the distribution pipe or manifold length, hole or distribution pipe spacing, number of holes, distribution discharge rate and hole diameter of pressure distribution systems by the placement of a straightedge between two known points.

TABLE B-3

RECOMMENDED MANIFOLD DIAMETERS FOR VARIOUS MANIFOLD LENGTHS, NUMBER OF DISTRIBUTION PIPES AND DISTRIBUTION PIPE DISCHARGE RATES (SCHEDULE 40 PLASTIC PIPE)

FLOW PER
PIPE (gpm)
MANIFOLD LENGTH (feet) FLOW PER
PIPE (gpm)
5 10 15 20 25 30
Number of distribution pipes with central manifold
4 6 4 6 8 10 4 6 8 10 12 6 8 10 12 14 6 8 10 12 14 6 8 10 12 14
Manifold diameter (inch)
5 1 11/4 11/4 11/4 11/2 2 11/4 11/2 2 2 2 11/4 11/2 2 2 3 2 2 3 3 3 2 2 3 3 3 10
10 11/4 11/2 11/2 2 2 3 2 2 3 3 3 2 3 3 3 3 3 3 3 3 3 3 3 3 4 4 20
15 11/2 2 3 3 3 3 2 2 2 2 4 3 3 3 3 4 3 3 4 4 4 3 3 4 4 4 30
20 2 3 3 3 3 3 3 3 3 3 4 3 3 4 4 4 3 4 4 4 4 3 4 4 4 4 40
25 2 3 3 3 3 4 3 3 3 4 4 3 3 4 4 4 4 4 4 4 4 4 4 4 6 6 50
  Number of distribution pipes with end manifold  
2 3 2 3 4 5 2 3 4 5 6 3 4 5 6 7 3 4 5 6 7 3 4 5 6 7
FLOW PER
PIPE (gpm)
MANIFOLD LENGTH (feet) FLOW PER
PIPE (gpm)
35 40 45 50
Number of distribution pipes with central manifold
6 8 10 12 14 16 6 8 10 12 14 16 18 6 8 10 12 14 16 18 20 6 8 10 12 14 16 18 20 22
Manifold diameter (inch)
5 2 2 3 3 3 3 2 3 3 3 3 3 3 2 3 3 3 3 3 3 3 2 3 3 3 3 3 3 4 4 10
10 3 3 3 3 3 3 3 3 3 4 4 4 4 3 3 3 4 4 4 4 4 3 3 3 4 4 4 4 4 4 20
15 3 3 4 4 4 4 3 4 4 4 4 4 6 3 4 4 4 4 6 6 6 3 4 4 4 4 6 6 6 6 30
20 3 4 4 4 6 6 3 4 4 6 6 6 6 4 4 4 6 6 6 6 6 4 4 6 6 6 6 6 6 6 40
25 4 4 4 6 6 6 4 4 4 6 6 6 6 4 4 6 6 6 6 6 6 4 4 6 6 6 6 6 6 6 50
  Number of distribution pipes with end manifold  
3 4 5 6 7 8 3 4 5 6 7 8 9 3 4 5 6 7 8 9 10 3 4 5 6 7 8 9 10 11

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 3.785 L/m.

TABLE B-4a

PUMP DOSING RATE

For SI: 1 gallon per minute = 3.785 L/m.

  1. This table, a nomogram, determines the distribution pipe or manifold length, hole or distribution pipe spacing, number of holes, distribution discharge rate and hole diameter of pressure distribution systems by the placement of a straightedge between two known points.

TABLE B-5

FRICTION LOSSa IN SCHEDULE 40 PLASTIC PIPE (C = 150)

FLOW
(gpm)
PIPE DIAMETER (inch)
1 11/4 11/2 2 3 4 6 8 10
1 0.07
2 0.28 0.07
3 0.60 0.16 0.07
4 1.01 0.25 0.12
5 1.52 0.39 0.18
6 2.14 0.55 0.25 0.07
7 2.89 0.79 0.36 0.10
8 3.63 0.97 0.46 0.14
9 4.57 1.21 0.58 0.17
10 5.50 1.46 0.70 0.21
11 1.77 0.84 0.25
12 2.09 1.01 0.30
13 2.42 1.17 0.35
14 2.74 1.33 0.39
15 3.06 1.45 0.44 0.07
16 3.49 1.65 0.50 0.08
17 3.93 1.86 0.56 0.09
18 4.37 2.07 0.62 0.10
19 4.81 2.28 0.68 0.11
20 5.23 2.46 0.74 0.12
25 3.75 1.10 0.16
30 5.22 1.54 0.23
35 2.05 0.30 0.07
40 2.62 0.39 0.09
45 3.27 0.48 0.12
50 3.98 0.58 0.16
60 0.81 0.21
70 1.08 0.28
80 1.38 0.37
90 1.73 0.46
100 2.09 0.55 0.07
125 0.85 0.12
150 1.17 0.16
175 1.56 0.21
200 0.28 0.07
250 Velocities in this area
become too great for the
various flow rates and pipe diameter
0.41 0.11
300 0.58 0.16
350 0.78 0.20 0.07
400 0.99 0.26 0.09
450 1.22 0.32 0.11
500 0.38 0.14
600 0.54 0.18
700 0.72 0.24
800 0.32
900 0.38
1,000 0.46

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 3.785 L/m.

  1. Friction loss expressed in units of feet per 100 feet.

TABLE B-6a

MINIMUM DOSE VOLUME BASED ON PIPE SIZE, LENGTH AND NUMBER

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon = 3.787 L.

  1. This table, a nomogram, determines the distribution pipe or manifold length, hole or distribution pipe spacing, number of holes, distribution discharge rate and hole diameter of pressure distribution systems by the placement of a straightedge between two known points.
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