Glossary of terms
Murray Irrigation is committed to providing clear information to
customers as part of the PIIOP upgrades. If you are unsure of any
terminology provided to you as part of the PIIOP project rollout,
please refer to the below glossary of terms. If the term is not
provided below then please contact a PIIOP Customer Consultation
Officer via reception on T. 1300 138 265. Alternatively you can
submit a message via the 'Contact' page with your request
for a term to be clarified and we will respond with the definition
and add it to this glossary for the benefit of all customers.
Murray Irrigation assets are described as infrastructure
owned and operated by Murray Irrigation. The company has over
25,000 assets and is responsible for the maintenance of these
assets. Examples of assets include bridges, stock stops,
regulators, syphons and sections of channel.
Amalgamation involves combining two or more Murray Irrigation
landholdings with a common boundary into one landholding. A fact
sheet with more information on amalgamation is available here.
The transfer of ownership of Murray Irrigation infrastructure to
the customer, upon the signing of an agreement between both
parties. An example includes the Reconfiguration project where the
customer executes a Reconfiguration Deed to take over ownership and
operation of a length of channel.
Compliant meters are meters that meet the national framework
standards for metering accuracy. Compliant meters are required to
have an accuracy of plus or minus five percent field measurement
The alternative to 'merging' accounts. Customers with multiple
water accounts and/or landholdings may retain multiple accounts
with a consolidated view of their water accounts. This option does
not affect the operation of individual accounts, but allows
customers to view a summary of their accounts together in one
place. A fact sheet with more information on consolidation is
Commissioning is when a structure such as an irrigation outlet
is installed and is then assessed and checked that it is suitable
Decommissioning is a process where certain Murray Irrigation
assets such as outlets or regulators are assessed and determined
that they are no longer required for use. The first step is to
complete a form where the structure is assessed by Murray
Irrigation and a process commences to remove from the company's
Decommissioning outlets is when the customer has no existing use
of the outlet under current arrangements. The customer will still
be paying annual fees for that outlet. Should the customer wish to
not receive any further annual fees they can nominate to have that
outlet decommissioned by contacting a Murray Irrigation Water
Distribution Supervisor, via reception on T. 1300 138 265. The
Distribution Supervisor will commence a process for removing the
outlet from Murray Irrigation's operational and accounting systems.
The form that is completed is Form IS-QF001 titled 'Application of
Works on Supply and Drainage System by Landholders'.
There are some cases where initiatives can be implemented by
customers regarding either alternative structures, outlet location
or decommissioning of their outlets that can lead to Murray
Irrigation decommissioning a regulator. Given that there are
financial savings through not upgrading a regulator, criteria has
been developed through the PIIOP Outlet and Meter Strategy to
provide financial incentives for customers that fall into this
In certain periods, demand for irrigation may exceed the
capacity of Murray Irrigation's supply system. When this occurs the
company may determine that restricted flow rates apply to
landholdings along certain sections of the channel system.
When flow restrictions occur, the flow through an outlet to a
landholding will be limited by the number of flow shares on that
landholding. If a landholding has been subdivided since 1995 the
landholdings may be subject to a portion of a flow share. If the
landholding has been amalgamated since 1995 the flow shares will be
based on those available before amalgamation. If more than 1,500
water entitlements were associated with a landholding as at 3 March
1995 (as determined by the company), the landholding may receive
water at double the restricted flow rate.
The size of the outlet that is installed on a landholding does
not affect the number of flow shares or the flow rate during
restrictions. For example, if a landholding has an extra-large
outlet and flow restrictions of 5ML/day are announced on that
channel section and that landholding has one flow share, the
maximum flow during the time of announced restrictions will be
5ML/day. Should an outlet be actively delivering water at a higher
flow rate and then flow restrictions are announced, the flow rate
will be reduced back to the announced flow restriction rate against
the available flow share. More information is included in the
company's Distribution Rules Policy, section 8 -
'Restricted flow regulation and management'.
Levels of service
High Level of Service
The High Level of Service (HLOS) applies where the Murray
Irrigation channel and outlets are automatically controlled, with
automation achieved by the replacement of some regulator gates with
a Rubicon FlumeGate™. In the HLOS areas, irrigation customers are
able to change their water orders more frequently, generally
allowing around four changes per day if channel flow conditions
Standard Level of Service
The Standard Level of Service (SLOS) applies where irrigation
outlets and regulators are controlled remotely. The SLOS is being
tested in the Yallakool Pilot area. Existing AWMA mechanised gates
in the SLOS area will be modified to allow for remote control. In
the SLOS area, customers are able to change their water orders
twice in a 24-hour period, if channel flow conditions allow. The
frequency of water order changes may increase after the Yallakool
Pilot is completed and the results known.
Link channels are small 'spurs' of channels that extend from
larger channels to supply irrigation water to a landholding.
Typically these channels are a few metres to two kilometres in
length and extend from upstream of a regulator within the larger
The alternative to 'consolidating' accounts. Customers with
multiple water accounts and/or landholdings may merge their
accounts into a single water account to simplify administration.
This means that whilst owning multiple landholdings and parcels of
water entitlements, the customer's water entitlements, delivery
entitlements, annual allocation and any annual trade are combined
together in a single account. Ownership of permanent water
entitlements and delivery entitlements is not altered. A fact sheet
with more information on merging is available here.
Outlets (types of outlets)
Dethridge outlets consist of a drum on an axle with eight v-shaped
veins fixed to the outside. The revolving wheel measures flow from
the supply channels in revolutions. One 'rev' per day is the
equivalent to 1.2ML/day. Dethridge outlets make up the majority of
outlets to be upgraded under PIIOP. Typically these outlets will be
upgraded to a Rubicon FlumeGate™ or SlipMeter™.
The FlumeGate™ is a combined flow measurement and control gate
designed by Rubicon Water to regulate flow in open channels. Flow
measurement, precise motor control, power supply and radio
telecommunications are fully integrated in a single device. In
free-flow or submerged conditions, flow is calculated from the
gate's own measurements of upstream water level, downstream water
level and gate position. The FlumeGate™ can be operated as a
stand-alone unit, or can coordinate with other gates along the
channel to optimise the whole network's flow. It can be managed and
monitored on-site or operated remotely when connected to Murray
Irrigation's SCADA network. The FlumeGate™ automatically controls
the flow of water by varying the gate position based on a desired
set-point or on irrigation demand.
Half wheels consist of a drum on an axle with eight v-shaped veins
fixed to the outside and are half the size of a standard Dethridge
outlet. One 'rev' per day from a half wheel is the equivalent of
0.6ML/day. Half wheels were originally designed to irrigate small
irrigated areas or hobby farms.
Large electric flow meters
Large electric flow meters have been installed in the last 10
years and typically consist of a 600mm drum with electronic sensors
around the inner circumference to measure water flow. Flow rates
can be up to 20ML/day and most are manually operated by a front
door. Large electric flow meters are within the scope of the
program and can be remote controlled by fitting a Rubicon
The SlipMeter™ is a flow meter with an integrated control gate
designed to automate irrigation service points. Accurate flow
measurement, precise flow control, power supply and radio
telecommunications are fully integrated in a single device. The
SlipMeter™ accurately measures flows even in turbulent conditions.
Instantaneous flow rate and total volume passed are recorded,
providing a precise account of water usage. It features a local LCD
display which provides the ability to control the service point and
view instantaneous flow rate, volume of current delivery, and total
flow volume for the season. The SlipMeter™ can be managed and
monitored on-site or operated remotely when connected to Murray
Irrigation's SCADA network.
Small pipes typically include pipes around 300mm or less in
diameter and are installed through the channel bank with a control
structure at the front to regulate flow.
Small outlets are irrigation outlets that have a flow rate to
Large outlets are irrigation outlets that have a flow rate up to
Extra-large outlets are irrigation outlets that have a flow rate
up to 30ML/day.
An offtake is a structure within Murray Irrigation's channel
system that controls water leading from a large channel or canal
into a smaller channel. It is similar to a regulator, though the
main purpose is supplying water into the
Reconfiguration is where a customer remains connected to our
channel system but has an alternate supply point. There are many
opportunities to reduce the length of channel or the number of
major channel assets by altering how a landholding is connected to
our channel system. Each reconfiguration project is assessed based
on its merits.
A regulator is a structure that controls water within Murray
Irrigation's channel system. Regulators are used to control channel
flows, and also to maintain water levels within a channel pool to
ensure water can be supplied at the correct full supply level
through an irrigation outlet.
Murray Irrigation's Supervisory Control and Data Acquisition
(SCADA) system uses radio communication to provide control of
remote equipment. It allows for automation and data collection of
This is a structure that is separate from the customer's main
supply outlet and is simply a pipe and two headwalls/pits that
links irrigation supply water from one side of the customer's
property to another (under either a Murray Irrigation channel or
storm water escape). The syphon effectively replaces one or more
This is one structure that effectively replaces two outlets. On
one side of Murray Irrigation's supply channel will be the outlet
and that same structure can then divert water to one side of the
landholding or underneath the Murray Irrigation supply channel to
the other side of the landholding.