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# Sewer Pipes - Capacities vs. Slope

The diagrams below can be used for design of sewage and wastewater gravity conveying systems.

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### Sewage Pipe Capacity - SI Units - liter per second

Note! - the charts are based on clean plastic pipes - calculated with the Manning formularoughness coefficient 0.015 and fill 50%.

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### @Example - Capacity of a Sewer Pipe

The capacity of a 4 inch sewer pipe with decline 0.5% is aprox. 25 gpm (1.6 liter/s).

• 1 gal (US)/min = 6.30888x10-5 m3/s = 0.227 m3/h = 0.06309 dm3(liter)/s = 2.228x10-3 ft3/s = 0.1337 ft3/min = 0.8327 Imperial gal (UK)/min

### Decline and Slope

Calculate between decline and slope units

d = 8.33 s(in/ft)

= 100 s(ft/ft)

= 100 s(m/m)

= s(ft/100ft)                                                    (1)

where

d = decline (%)

s = slope

#### Example - % Decline

1/8 in/ft slope can be transformed to % decline as

d = 8.33 (1/8 in/ft)

= 1.04 %

## Related Topics

### • Fluid Flow and Pressure Loss in Pipes and Tubes

Fluid flow and pressure loss in pipe lines. Water and sewer systems. Steel pipes, pvc pipes, copper tubes and more.

### • Sanitary Drainage Systems

The purpose of the sanitary drainage system is to remove effluent discharged from plumbing fixtures and other equipment.

## Related Documents

### ASTM B306 Copper Tubes for Drain, Waste and Vent - Dimensions and Working Pressures

Dimensions of copper tubes ASTM B306 Drain Waste and Vent - DWV.

### California Pipe Flow Metering Method

Calculate the discharge length from the open end of a partially filled horizontal pipe.

### Cast Iron Soil Pipes - Dimensions

Dimensions of cast iron soil pipes.

### DFU - Drainage Fixture Units

DFU are used to calculate the drainage flow from fixtures and the required capacities of sewer service systems.

### Ditch Filling Materials - Densities

Weight or density of ditch filling materials.

### Drain Pipes and Vent Stacks

Drain pipes and vent stack sizing.

### Drain Waste and Vent Pipes - Hanger Spacing

Support of Drain Waste and Vent - DWV - pipes.

### Drains and Sewers - Capacities vs. Size

Drainage Fixture Units (DFU) connected to building drains and sewers.

### Fiberglass Pipes - common Standards

Commonly used standards for fiberglass pipes and their applications.

### Fixtures Trap Sizes

Recommended drain trap sizes for different types of fixtures

### Manning's Formula and Gravity Flow

Calculate cross-sectional average velocity flow in open channels.

### Pipes - Relative Capacity

Relative capacity between larger and smaller pipes.

### Sanitary Drainage Systems - Volume Flow

Calculate expected volume flow load in sanitary drainage systems.

### Sanitary Piping - Drainage Fixtures Unit Loads

Maximum Drainage Fixture Unit - DFU - loads in sanitary piping systems.

### Septic Systems

Septic systems handles waste from drain systems.

### Sewage Sludge - Viscosities

Viscosity of sewage sludge vs. content of solids.

### Storm-Water Conductors

Roof drain capacities.

### Storm-Water Runoff Coefficients vs. Surface

Storm-water runoff coefficients for various surfaces

### Trap Sizes vs. Fixture Units

No. of fixture units and required trap size.

### Waste Water Piping - Flow Capacities vs. Dimensions

In sewage piping and pumping systems the fluid flow rate must be kept within certain limits to avoid operating problems.

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