AVBP 287 PRODUCE AN ENGINEERING

DESIGN FOR A STORMWATER

RETICULATION SCHEME Compiled By Civil Team

Swinburne University of Technology

CIVIL ENGINEERING

Environmental engineering

Geotechnical engineering

Structural engineering

Water engineering

Transport engineering

Construction engineering

STORMWATER

Stormwater ( surface runoff) is the second major urban

flow of concern to the drainage engineer.

Stormwater is generated by rainfall, and consists of

that proportion of rainfall that runs off from urban

surface.

The properties of stormwater are the nature and

characteristics of both the rainfall and the catchment.

STORMWATER RUNOFF GENERATION

PROCESSES

STORMWATER POLLUTION

Impervious surfaces (parking lots, roads, buildings, ect) do not

allow rain to infiltrate into the ground, more runoff is

generated than in the undeveloped condition.

WHAT CAN WE DO ABOUT URBAN

STORMWATER POLLUTION?

The most effective way to reduce stormwater pollution is to stop it entering the system in the first place.

Tips to prevent stormwater pollution:

Washing your car

Fixing your car

Composting

Put litter in a bin

Paint brush cleaning

Cleaning the footpath

Pick up dog droppings

Avoid using weed killers close to rain period or in wind

Landscape using native plants

STORMWATER SYSTEM

The stormwater system is designed to take rainwater

from streets and guttering into the closest waterway

Unlike sewage, stormwater is not treated before it

enters waterway

In some cases it is filtered by traps or wetlands,

usually located at the end of the pipe system, but in

most cases it flows directly from streets and gutters

into creeks, rivers, bays and the ocean.

Rain , a form of precipitation, is the first form of

water in the hydrologic cycle, the continuous

circulation of water in the earth-atmosphere

system.

Rain is the primary source of water that feeds

rivers, lakes, and groundwater, which are all

secondary sources of water.

Rainwater catchment directly responds to the

value of this primary source of water, making

optimal use of rainwater where it falls.

Rain scupper on a

building Water tank

ROOF CATCHMENT

RAINWATER

Rainwater is a valuable natural resource that can be

collected for household use.

Using rainwater can reduce your water bills

Provide a supply of restriction free water

Reduce community infrastructure costs

ADVANTAGES

Rainwater can aid self-sufficiency, providing a

back-up in case of water restrictions.

On rural properties, rainwater can provide a

better quality potable supply than river, bore or

dam water.

Rainwater tanks can also provide cost-effective

on-site detention of stormwater.

Depending on tank size and climate, reticulated

water use can be reduced by 50% in urban areas.

DISADVANTAGE

In areas with reticulated water supply the main

disadvantage of installing a rainwater is the

financial cost.

The rainwater tank will cost minimum of $500 for a small

400L tank to around $8000 for a 100,000L tank.

The regular maintenance, such as checking and

cleaning gutters.

Health risks can arise if maintenance is not carried out.

Reliability

Small tanks may not have sufficient water available in mid-

summer.

WATER TANK

If you drink your rainwater it is recommended that you install a filter.

RAINWATER SYSTEM

CONFIGURATIONS

Gravity fed system

with pump (can be

solar)

RAINWATER SYSTEM CONFIGURATIONS

Dry system

RAINWATER SYSTEM CONFIGURATIONS

Wet system

RAINWATER SYSTEM CONFIGURATIONS

Gutter storage systems

Gutter storage systems

are best suited to new

houses, as the cost of

the gutters can be

offset by savings in

building materials.

The system is designed

to gravity feed non-

potable water for toilet

flushing and garden

watering.