SCADASupervisory Control and Data Acquisition

SCADA is the system that controls the various operating processes at our facilities. It is also the system that collects and stores real-time data from sensors and other devices for reporting, analysis and optimization of our treatment processes.

What is SCADA?Supervisory Control and Data Acquisition

SYSTEMS SIMILAR TO SCADA

You encounter SCADA-like systems almost every day.

Most of today’s vehicles are equipped with systems similar to SCADA.

Rivanna’s SCADA system is utilized by its operators and managers to monitor and supervise the production and treatment processes at the water and wastewater facilities.

Operator “Dashboard” or HMI screen at theSouth Rivanna Water Treatment Facility

SUPERVISORY

• Operators are able to controlon-site processes along with those at remote facilities.

• Programmed set points and trending parameters are continuously monitored and adjusted as needed using real-time raw data. This allows the SCADA “system” to make adjustments as conditions change.

CONTROL

Rivanna Pump Station Process Screen

RIVANNA PUMP STATION – PUMP CONTROL

CONTROL

Staff can remotely monitor and control a variety of assets including:

Wastewater4 Water Resource Recovery Facilities7 Pump Stations

Water4 Reservoirs5 Treatment Facilities8 Pump Stations

11 Storage Tanks Operator Control Station at the

South Rivanna Water Treatment Facility

The SCADA network infrastructure is comprised of:

• Leased data lines

• Modems

• Radio networks

• Cellular transmission

• Secure IP network tunnels

• Internal – wide and local area networks controlled by network routers Cellular Router

ACQUISITIONCommunication Network

ACQUISITIONNETWORKING DIAGRAM

Historical data is stored on the main servers. The main hub resides in the Administration building.

• HP Generation 9 state of the art servers to securely store the acquired data.

• Robust database software helps manage and use that data for analysis.

ACQUISITIONCommunication Network

Bank of servers

• There are over 12,500 input/output data points being collected, communicated and recorded.

• There are over 2,000 potential alarms that are monitored.

DEVICES

Tank Level IndicatorSouth Rivanna Elevated Tank

Level IndicatorSugar Hollow Reservoir

Devices continuously communicate with PLCs 24 hours a day, 7 days a week via the network.

Return activated sludge flow meter

Scottsville AWRRF

PLCProgrammable Logic Controller

The PLC, much like a computer, serves as the central processing unit. It houses most of the major programming and communicates with devices and servers via the network.

The bulk of PLCs used by Rivanna are manufactured by GE and controlled by GE proprietary software. The PLCs require periodic software updates.

• Annual license renewal cost: $30,000

• Hardware upgrade per PLC: $5,000 - $30,000 PLC at Observatory Water Treatment Facility(over 15 years old)

HMIHuman Machine Interface

HMI is a program that runs on a standard desktop or laptop workstation.

The operator interacts with the SCADA system using the Dashboard/HMI screen. With the use of PLCs, the network and connected devices, the operator has the ability to:

• Real-time data only

• Start/stop a pump

• Change timer settings

• Control feed rates

• Monitor alarms, etc. Operator “Dashboard” or HMI screen at theSouth Rivanna Water Treatment Facility

SCADA SYSTEMS and NETWORKS

SERVERS PLCsNETWORK SWITCHES

COMM. DEVICES

Water 8 30 14 31

Wastewater 6 32 25 7

Total 14 62 39 38

PLC at Moores Creek Advanced Water Resource Recovery Facility

WHY IS SCADA IMPORTANT?

SCADA technology is essential to meet modern day needs of the municipal water and

wastewater industry.

Complicated treatment processes – Nutrient reduction goals for the ENR project would

be difficult to achieve without the precision of SCADA.

Vital data that was once thought to be unattainable is now available instantly.

Real time data (Efficient resolution of line break and distribution issue.)

Efficiencies: Sampling changes, staffing efficiencies, remote monitoring

SECURITY, STORAGE and RECOVERY

Ensuring that our SCADA system is secure at all times is a number one priority.

• Access is restricted from outside Rivanna's Wide Area Network.

• Connection between routers through secure IP tunnels (IPSEC).

• NGFW (next generation firewalls); data is encrypted and secured from outside malware and intrusion attempts. NGFW is installed at each facility and on all outward facing devices.

• For protection, multiple authentication steps are required to access HMIs.

SECURITY, STORAGE and RECOVERY

• Each facility hosts at a minimum one SCADA dedicated server which houses the HMI/PLC

programs and databases. Servers are backed up routinely to ensure the recovery of

essential data.

• In the event of a system failure, IT maintains two fully functioning standby SCADA servers

with the most current programs that can be installed at any facility in less than one hour.

• The IT Department maintains an extensive spare

parts and equipment inventory. This proactive

approach ensures minimal impact on operations

during equipment repair and replacement.

DATA & REPORTING

Data is the heart of SCADA. All of the information collected is stored in databases and can be accessed at any time.

Data is used for:

• Regulatory and compliance reporting.

• Trending and benchmark reports for strategic planning.

• Providing critical data for capital project design.

• Treatment problem solving.

The Maintenance Department is also an important resource in maintaining the SCADA system.

GENERAL IT SUPPORT

• I5-20 Non-SCADA servers

• 80-100 Workstations

• Accounting software (Microsoft

Dynamics GP 2013)

• Septage data collection

management

• Solid waste scale crossing and

ticketing software (WasteWorks)

• GIS software

• Maintenance work order,

preventive maintenance software

• Fuel Management software

• Laserfiche

• Security monitoring, video and

cell phone management

RESOURCES

TYPE COST TIMING

MANPOWER $120,000 YEARLY

LICENSING/SUPPORT $30,000 + YEARLY

TRAINING $5,000-$10,000 YEARLY

PLC REPLACEMENT $5,000-$30,000 EACH 7-10 YEARS

OIT DEVICE REPLACEMENT $1,000-$3,000 EACH AS NEEDED

SERVER $2,000-$5,000 EACH 2-4 YEARS

WORKSTATION $1,000-$1,500 EACH 3-5 YEARS

BUDGET

SCADA specific Budget FY 2018: $154,000Instrumentation Budget FY 2018: $134,000

NEAR-TERM and FUTURE PROJECTS

Near-Term Projects

• Granular Activated Carbon (GAC) upgrade at each water treatment facility

• Sugar Hollow valve automation

• Crozet Finished Water Pump Station

Future Projects

• Improve data management software

• Modernize remote communications(radio network has exceeded its recommended useful life of 8-10 years)

Woodard & Curran study recommended nearly $2.4 million ($1.3 for water and $1.1 for wastewater) in system changes, optimizations, improvements and programming upgrades.

HARDWARE PEOPLE

PROCESS/ CONTROL

SOFTWARE

DATA & REPORTING