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Flow Survey ManagementPlanning & Data Auditing
Ravikeerti S. Patil
25 June 2010
Understand project objectives:• model type and objectives will determine no, location, spread and
density of monitoring equipment
Programme and duration?• contractor and equipment availability
Desk study in first instance:• what information is available to complete flow survey planning
stage
Field surveys:• check each proposed site and at least two alternatives with the
contractor
26/06/2010 Page 2
Flow Survey Planning
Factors affecting flow monitoring locations:• H&S – no compromise,
• access to the site,
• size of a pipe and flow depth,
• monitor location – incoming / outgoing pipe,
• flow conditions,
• gradient,
• Velocity,
• manhole condition,
• bends, junctions, backdrops etc.
Improving flow monitoring sites
Site Selection is crucial to returning good quality data.
Flow Survey Planning
26/06/2010 Page 3
FM Performance Polygon & Monitoring Locations
FM Location
RG Location
Installation reports:
• flow monitor is in right manhole
• flow conditions – visual or on-site
• pipe shapes and sizes
• silt measurements
Weekly reports
Calibrations reports
Velocity, depth and pressure sensors are working
Flow Data Analysis: Important Checks
26/06/2010 Page 5
Flow Monitoring Schematic
26/06/2010 Page 6
Level and velocity profile are good, Scatter is tight – Very Good Data
Level and velocity profile are good, Scatter is bit wider – Good data
Previous Week | This week Previous Week | This week
Data Quality Grading
26/06/2010 Page 7
Level data good but velocity profile bit noisy - Scatter is wider – Reasonable Data
Level and velocity profile are very noisy (pumping profile), Scatter is not so good – Bad Data
Previous Week | This week Previous Week | This week
26/06/2010 Page 8
Data Quality Grading
Regular Maintenance Activity – Flow diversion at u/s of monitoring point
Regular Maintenance Activity – Weekly Siphon Flushing on Monday
Flow Data Analysis
26/06/2010 Page 9
Temporary ragging caused level and velocity data degradation
Surcharge in the system caused velocity sensor to malfunction
Flow Data Analysis
26/06/2010 Page 10
Flow
m3
/sPeak Propagation and Volume Balance
Data Quality Grading Summary
26/06/2010 Page 12
Data quality
Any missing or bad data
Identifying storm event
• Total depth
• Minimum Intensity
• Storm Duration
• Percentage variability
Identifying dry day period
Serviceability of flow monitors
Rain Data Analysis and Event Selection
26/06/2010 Page 13
26/06/2010 Page 14
Rain Data Analysis and Event Selection
Data sources:• Weekly flow and rainfall data,
• SCADA data, if any,
• Flow data - permanent / temporary flow monitors, if any,
• Online checking of rainfall data,
• Application of radar data to analyse spatial variation,
• Regular site visits
Flow Survey Management: In General
26/06/2010 Page 15
Flow data analysis and data checks:
• Weekly data quality checks of flow and rainfall data,
• Liaising with the client on regular basis regarding:- data quality, relocation issues, calibration checks,- operational issues, health & safety issues, traffic management
plans etc.
• Producing and issuing progress reports,
• Regular meetings with the Contractor
26/06/2010 Page 16
Flow Survey Management: In General