PIPE SIZING AND GRADING TABLES

TABLE SW 4.1

DN 150 RETICULATION SEWERS

Grade% Min Max ≤100 EP/Ha >100 EP/Ha
PDWF1 DF2
(L/s) (L/s) Min EP3 Max EP4 Min EP3 Max EP4
0.65 2.4 12.5 170 270 130 320
0.70 2.0 13.0 130 280 100 340
0.75 1.5 13.4 90 290 70 350
0.80 1.3 13.9 70 310 50 370
0.85 1.1 14.3 50 320 40 380
0.90 0.8 14.7 30 330 30 390
0.95 0.6 15.1 20 340 20 410
1.00 0.5 15.5 20 350 20 420
1.05 0.5 15.9 1 360 1 440
1.20 0.5 17.0 1 390 1 470
1.40 0.5 18.4 1 420 1 520
1.60 0.5 19.7 1 460 1 550
1.80 0.5 20.9 1 490 1 570
2.00 0.5 22.0 1 530 1 590
2.50 0.5 24.6 1 580 1 600*
≥2.90 0.5 26.5* 1 600* 1 600*

Notes:
1. Minimum PDWF (peak dry weather flow) is the minimum flow rate at the nominated
grade required for self cleaning (i.e. flow to achieve a velocity of 0.7 m/s).
2. Maximum DF (design wet weather flow) is the flow that would result in the pipe running
full at the nominated grade.
3. The EP connected to the sewer at the nominated grade shall be at least “Min EP”, i.e. the
EP required to achieve self cleaning flow as nominated in Column 2.
4. The EP connected to the sewer at the nominated grade shall not exceed “Max EP”, i.e. at
the nominated grade and “Max EP” the design flow would be as shown in Column 3.

* Maximum allowable EP = 600 (Refer WSA 02 Clause 4.5, Table 4.4)

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TABLE SW 4.2

DN 225 RETICULATION SEWERS

Grade Min Max ≤100 EP/Ha >100 EP/Ha

% PDWF1 DF2 3 4
(L/s) (L/s) Min EP Max EP Min EP3 Max EP4
0.40 5.8 29.0 550 720 430 910
0.45 4.7 30.7 410 780 320 970
0.50 3.8 32.4 310 830 250 1030
0.55 3.1 34.0 230 880 180 1100
0.60 2.5 35.5 180 930 140 1160
0.65 2.1 36.9 140 970 110 1210
0.70 1.6 38.3 100 1000 80 1270
0.75 1.4 39.7 80 1060 70 1320
0.80 1.2 41.0 60 1100 60 1380
0.85 0.9 42.2 50 1140 40 1420
0.90 0.8 43.3 30 1170 30 1440
0.95 0.6 44.7 20 1220 20 1470
1.00 0.5 45.8 1 1250 1 1490
1.05 0.5 47.0 1 1290 1 1510
1.20 0.5 50.2 1 1390 1 1560
1.40 0.5 56.1 1 1520 1 1600*
1.60 0.5 60.6 1 1590 1 1600*
≥1.80 0.5 61.5* 1 1600* 1 1600*

Notes:
1. Minimum PDWF (peak dry weather flow) is the minimum flow rate at the nominated
grade required for self cleaning (i.e. flow to achieve a velocity of 0.7 m/s).
2. Maximum DF (design wet weather flow) is the flow that would result in the pipe running
full at the nominated grade.
3. The EP connected to the sewer at the nominated grade shall be at least “Min EP”, i.e. the
EP required to achieve self cleaning flow as nominated in Column 2.
4. The EP connected to the sewer at the nominated grade shall not exceed “Max EP”, i.e. at
the nominated grade and “Max EP” the design flow would be as shown in Column 3.

* Maximum allowable EP = 1600 (Refer WSA 02 Clause 4.5, Table 4.4)

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TABLE SW 4.3

RECEIVING SEWER LOADINGS

PUMPED FLOWS FROM SINGLE-SPEED STATIONS

Table SW 4.3 addresses flow adjustments to be made to a sewer’s PDWF, DF, minimum EP
and maximum EP where the sewer is to receive flow from a fixed-speed pumping station.

1. Table SW 4.3 does not apply to flows from variable-speed pumping stations.

2. Designs of new sewers receiving pumped flows shall be prepared in consultation with
Sydney Water.

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SYDNEY WATER CORPORATION

TABLE SW 4.3

PUMPED FLOWS / RECEIVING SEWER LOADINGS

Pump Pumped Contribution to Receiving Sewer’s Pumped Contribution to Receiving Sewer’s

Discharge Min PDWF and Min EP DF and Max EP
Rate PDWF Contribution to Receiving Sewer DF Contribution to Receiving Sewer
(L/s) (L/s) Min EP (L/s) Max EP
Note 1 Note 2 Note 3 Note 4
≤50 100 200 ≥400 ≤50 100 200 ≥400
EP/Ha EP/Ha EP/Ha EP/Ha EP/Ha EP/Ha EP/Ha EP/Ha
10 5 500 400 300 200 10 300 300 400 400
30 15 2100 1700 1300 1100 30 1000 1200 1400 1700
50 25 4000 3300 2700 2100 50 1900 2200 2700 3200
100 50 9100 7900 6600 5300 100 4300 4500 6300 6800
150 75 14600 13000 11000 9100 150 6800 8100 10200 12800
200 100 20300 18300 15800 13200 200 9400 11300 14300 18000

Notes:
1 Fifty (50) percent of the pump discharge rate shall be deemed to contribute to the receiving sewer’s PDWF.
2 One hundred (100) percent of the pump (single-speed) discharge rate shall be deemed to contribute to the receiving sewer’s DF (L/s).
3 The equivalent EP loading on the receiving sewer from the pumped inflow is dependent on the population density (EP/Ha) of the receiving
sewer’s catchment.
4 The “Max EP” loading on the receiving sewer from the pumped inflow is dependent on the population density (EP/Ha) of the receiving
sewer’s catchment.

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TABLE SW 4.4

RECEIVING SEWER LOADINGS

UPSTREAM GRAVITY FLOWS

Table SW 4.4 addresses the impact of flows from an existing upstream gravity sewer that will be
diverted into the new sewer.

1. Designs of new sewers receiving flows from existing gravity sewers shall be prepared in
consultation with Sydney Water.

2. Peak dry weather (PDWF) and wet weather flows (DF) from an existing upstream gravity
sewer shall be as determined and advised by Sydney Water (generally based on gauged
data and / or modelling of the existing sewer).

3. Given that the existing sewer may be aged and subject to higher levels of inflow /
infiltration, the default values of the Sewerage Flow Schedule may not be suitable for
estimating flows from existing upstream sewers or converting upstream EP to receiving
sewer EP loadings. Flows from existing upstream sewers must therefore be stated in L/s,
not EP.

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SYDNEY WATER CORPORATION

TABLE SW 4.4

UPSTREAM (U/S) GRAVITY FLOWS / RECEIVING SEWER LOADINGS

U/S U/S Contribution to Receiving Sewer’s U/S U/S Contribution to Receiving Sewer’s
PDWF and Min EP DF and Max EP
Sewer PDWF Contribution to Receiving Sewer
Sewer DF Contribution to Receiving Sewer
PDWF (L/s) Min EP DF (L/s) Max EP
(L/s) Note 2 Note 3 (L/s) Note Note 5
Note 1 ≤50 100 200 ≥400 Note 1 4 ≤50 100 200 ≥400
EP/Ha EP/Ha EP/Ha EP/Ha EP/Ha EP/Ha EP/Ha EP/Ha
5 5 500 400 300 200 10 10 300 300 400 400
10 10 1200 1000 800 600 25 25 800 900 1100 1300
20 20 3000 2500 2000 1600 50 50 1900 2200 2700 3200
30 30 5000 4200 3400 2700 100 100 4300 4500 6300 6800
40 40 7000 6000 5000 4000 150 150 6800 8100 10200 12800
50 50 9100 7900 6600 5300 200 200 9400 11300 14300 18000
60 60 11300 9900 8300 6800 250 250 12200 14700 18500 23700
70 70 13500 11900 10100 8300 300 300 14900 18000 23000 29500
80 80 15700 14000 12000 9900 350 350 17800 21500 27500 35500
Notes:
1. PDWF and DF from the existing upstream sewer will be determined by Sydney Water.
2. One hundred (100) percent of the upstream PDWF (L/s), as advised by Sydney Water, shall be deemed to contribute to the receiving
sewer’s PDWF.
3. The equivalent self-cleansing EP loading on the receiving sewer from an existing upstream sewer is dependent on the population density
(EP/Ha) of the receiving sewer’s catchment.
4. One hundred (100) percent of the upstream wet weather flow, DF (L/s), as advised by Sydney Water, shall be deemed to contribute to the
receiving sewer’s DF (L/s).
5. The equivalent “Max EP” loading on the receiving sewer from an existing upstream sewer is dependent on the population density (EP/Ha) of
the receiving sewer’s catchment.

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