Nevada Administrative Code › Chapter 445A - Water Controls › ON-SITE SEWAGE DISPOSAL SYSTEMS › Operation and Monitoring of Systems › Section 445A.969 - Pressure distribution system

Current through June 11, 2024
1. A pressure
				distribution system may be used in conjunction with any effluent absorption
				system that uses distribution pipes. A pump must be used to pressurize the
				pressure distribution system.
2.
				The active dosing volume of a pressure distribution system must be
				approximately 10 times the total volume of the distribution pipe used in the
				effluent absorption system.
3. A
				solid delivery pipe which connects the dosing tank to the perforated
				distribution piping must be placed below the frost line. The delivery pipe must
				maintain a downward slope from the distribution lines to the dosing tank to
				ensure drainage between discharges. The use of check valves and other devices
				that prevent backflow to the pump is prohibited.
4. To reduce the potential for plugging and
				clogging of distribution pipes, the diameter of the discharge hole must be at
				least 3/8 inch. If an effluent screen is used, the diameter of the discharge
				hole may be reduced accordingly. The rate of discharge for various-sized holes
				at various pressures are set forth in the following table:
DISCHARGE RATES AT VARIOUS PRESSURES
							 (gallons per minute)
Pressure
Hole Diameter
Per Foot of Water
Per Square Inch
3/8 Inch
7/16 Inch
1/2 Inch
1
0.43
1.66
2.26
2.95
2
0.87
2.34
3.19
4.17
3
1.30
2.87
3.91
5.10
4
1.73
3.31
4.51
5.89
5
2.17
3.71
5.04
6.59
5.
				Friction losses in schedule 40 plastic pipe are listed in the following table:
FRICTION LOSS IN SCHEDULE 40 PLASTIC
							 PIPE; C = 150 (ft per 100 ft)
Pipe Diameter (inches)
Flow in gallons per minute
1
1 1/4
1 1/2
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
0.76
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
20-24
5.23
2.46
0.74
0.12
25-29
3.75
1.10
0.16
30-34
5.22
1.54
0.23
35-39
2.05
0.30
0.07
40-44
2.62
0.39
0.09
45-49
3.27
0.48
0.12
50-59
3.98
0.58
0.16
60-69
0.81
0.21
70-79
1.08
0.28
80-89
1.38
0.37
90-99
1.73
0.46
100-149
2.09
0.55
0.07
150-199
1.17
0.16
200-249
0.28
0.07
250-299
0.41
0.11
300-349
0.58
0.16
350-399
0.78
0.20
0.07
400-449
0.99
0.26
0.09
450-499
1.22
0.32
0.11
500-599
0.38
0.14
600-699
0.54
0.18
700-799
0.72
0.24
800-899
0.32
900-999
0.38
1000 or more
0.46
6.
				Distribution pipes in the pressure distribution system must be
				looped.
7. Lateral distribution
				pipes must be spaced so that they are not less than 4 feet or more than 6 feet
				apart. The outside laterals must be placed at a distance from the perimeter of
				the absorption area that is equal to one-half of the distance between the
				lateral distribution pipes.
8.
				Manifold diameters for various manifold lengths, number of laterals and lateral
				discharge rates for plastic pipe are shown in the following diagram:
Click
				  here to view image.
9. The required lateral pipe diameters for
				various hole diameters, hole spacings and lateral lengths for plastic pipe are
				shown in the following diagram:
Click
				  here to view image.
Added to NAC by
				  Environmental Comm'n by R194-07, eff. 8-26-2008
NRS
					 445A.425