Clearwater Reduction I/I Program

Sustainability Plan Goals

Maintain and extend the hydraulic capacity of the treatment plant and interceptor system by decreasing clearwater intrusion.

Annual Clear Water Review Program

Three Performance Indicators

  1. WRRF Flows
  2. CMAR Findings
  3. Antecedent Moisture Model (AMM) Analysis

2021 is a Transition Year for the AMM Analysis

District Philosophy

Use best available technology (BAT) when wise to do so

2006 – Used Three BATs to Evaluate I/I Performance

  1. Ultrasonic Flow Meters
  2. Antecedent Moisture (AM) Model
  3. Collection System Model

That Progressive Approach Achieved an Important Objective

Avoided $30MM in infrastructure improvements at the time, which is equivalent to $48MM today

2006 – Used Three BATs to Evaluate I/I Performance

  1. Ultrasonic Flow Meters
  2. Antecedent Moisture (AM) Model [Innovative, Embryonic Technology]
  3. Collection System Model

BATs Today

1. Ultrasonic Flow Meters Laser Flow Meters
2. Antecedent Moisture (AM) Model [Proprietary, Not Supported]
3. Collection System Model with Integral Robust Antecedent Model

Better Data + Better Tools = Better Information

Laser Flow Meters
Remarkable Accuracy

Collection System Model with Robust Antecedent Model
Commercially Available and Supported
System Can Be Readily Re-Calibrated Annually

Schedule

  1. Collect Flow Data Balance of 2021 in 15-minute Increments
  2. Develop and Calibrate Model Early 2022
  3. Present New AMM Analysis Q1 2022