Flow Survey Management Planning & 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 26/06/2010Page 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 26/06/2010Page 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 26/06/2010Page 5

Flow Monitoring Schematic 26/06/2010Page 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 Data Quality Grading 26/06/2010Page 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 26/06/2010Page 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 26/06/2010Page 9

Temporary ragging caused level and velocity data degradation Surcharge in the system caused velocity sensor to malfunction Flow Data Analysis 26/06/2010Page 10

Flow m 3 /s Peak Propagation and Volume Balance

Data Quality Grading Summary 26/06/2010Page 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 26/06/2010Page 13

26/06/2010Page 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 26/06/2010Page 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 26/06/2010Page 16 Flow Survey Management: In General

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