Leveraging GIS Data to Prevent Water Pollution. Presented By: Mike Homenuke, EIT Kerr Wood Leidal Associates Ltd. (KWL)

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1 Leveraging GIS Data to Prevent Water Pollution Presented By: Mike Homenuke, EIT Kerr Wood Leidal Associates Ltd. (KWL) URISA BC Environmental Decision Making with GIS June 10, 2008

2 Overview Sewers and Water Pollution Preventing Water Pollution YOUR FIRED! GIS Techniques

3 Sewerage Systems Collect, convey and treat wastewater Sanitary, storm or combined Maintain health, safety of people & environment

4 What Makes Up Sewer Flows Inflow & Infiltration (I&I) Direct Stormwater Connections Leaking Joints & Defects Base Sanitary Flow (BSF) Fixtures Industrial Processes I&I 70% BSF 30%

5 Inflow & Infiltration Rainfall or Snowmelt Inflow from Surface Runoff Infiltration from Groundwater Private & Public Sources Source: King County Natural Resources & Parks

6 I&I Flow Event White Rock 2001/2002 Flow Monitoring Site 1 Feb 21-24, 2002 DWF Feb 21-24, 2002 RDII Rainfall Flow (l/s) Hourly Rainfall (mm) Mon Feb 18 Tue Feb 19 Wed Feb 20 Thu Feb 21 Fri Feb 22 Sat Feb 23 Sun Feb 24 Mon Feb 25 Tue Feb 26 Wed Feb 27 Date Kerr Wood Leidal Associates Ltd. O:\ \ \IIAnalysis\[Site1II.xls]Setup

7 Sanitary Sewer Overflows Causes Blockage/Collapse I&I Events Mechanical/Electrical Failure Source: US EPA Inadequate Design Over 1,000,000,000 Litres Spilled Last Year

8 Steps to Overflow Prevention This is where decisions get made. It is critical to complete the previous steps to make the right decision! 4. Develop Upgrade & Renewal Plan Q = (1/n) A R h 2/3 S 1/2 3. Assess System Capacity 2. Inspect Assets, Measure I&I 1. Collect Asset Inventory Data

9 What Do We Know About It? Must Have: Unique ID Dimensions Location Material Elevation Metadata Nice to Have: Age Condition Make/Model Supplier/Contractor Record Drawings Operations Records

10 Data Management Industry Standard Templates Open Data Structures Computerized Maintenance Management Systems Proprietary Systems Interoperability DIY Consistency & Documentation

11 Relational Model for Sewers Network (Pipes & Nodes) Typical Completeness Administration/ Finance High Low Features (Valves, Pumps) Facilities (Pump Stations) Operations Equipment (Motors, Switches) Scheduled Tasks Unscheduled Tasks Records

12 Inspections & Maintenance Data D CLJ JDM DJ BJ SSMJ CLJ CLJFC CLJ Smoke/Dye Testing (Cross- Connections) BJ CLJ CLJ SSMJ D D D D Closed-Circuit TV (Pipelines) JDM FLD B CL BJ BJ CL JDM H JDM CLJ Visual Inspections (Manholes, Facilities) H H C Work Orders & Service Calls

13 Linear Referencing for CCTV Material VC200 VC200 VC200 VC200 VC200 Diameter Material Changes Defects VC VC150 AC150 AC150 Network Features PVC200 VC200

14 Locating the Problems I&I Visible Infiltration Abandoned or Storm Connections!(!(!(!(!( Blockages 5 Connections for 2 Lots! Roots!(!(!( Debris Structural Defects

15 Sewer Rehabilitation CLJ 39-EPR BJ 1718 FLJ CLJ Proposed Lining Proposed Excavated Point Repair Sanitary Manhole Sanitary Main Structural Defects! Break/Collapse Crack Deformation Fracture Hole Joint Spalling/Wear SanRepairs Design Engineer Specifies Shape Excavated Line Point Repair for Subtype Cluster of Defects. Excavated Point Point Repair RepairID ID Assigned EPR-39 to Cluster, Length Remaining Defects Assigned ID 3.0 Defects of Liner Repair CLJ, BJ 11-FLN Maintain relational link between repairs and defects Spatial accuracy is important CC OJM SanStructuralDefects Shape Design Engineer Point Specifies (M) Subtype Liner Repair for Break Full Length of Pipe, Each Defect Gets DetailID Repair ID Assigned Distance 34.5 DefectCode BJ RepairID EPR FCJ 4-FLN FLJ CLJ FC 3159 GIS Routine Plots CCTV Observations Along Pipe at Measured Distance

16 Hydraulic Modelling Service Layer Generate Demands Legal & Land Use Service Connections Population & Area Network Layer Assess Capacity Pipes Manholes/Nodes Facilities

17 System Analysis

18 Capital Planning Size Upgrades Estimate Costs Determine Priorities

19 Resource Recovery Sewer Flow ~15-20ºC UVic Extract Heat Using Heat Pump Downtown Hospital Distribute to Buildings Boiler Potential Heat Supply Low Medium High Potential Heat Demand Density None Low Medium High

20 Leveraging GIS for Wastewater 1. Complete & Accurate Asset Inventory 2. Publish Inspections & Maintenance Data Through GIS 3. Models & Geoprocessing to Enhance Decision Making

21 Questions? Contact: Mike Homenuke, B.A.Sc., EIT Kerr Wood Leidal Associates Ltd. Phone: (604)