Recycled Water Customer Conversions OC WateReuse Meeting Presented - - PowerPoint PPT Presentation

Recycled Water Customer Conversions

OC WateReuse Meeting

Presented By: Mark Marcacci & Mitch Robinson

June 15, 2017

Project Background – IRWD Recycled Water System

• 50 Years of Recycled Water!
• Recycled System Summary

– 540 miles of recycled pipes – 26 BPS – 17 Tanks & Reservoirs

• 1,810 miles of potable pipes
• ~30% of total demand is

supplied by recycled water

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Project Background – Purpose & Goals

• Why hydraulic modeling?
• Developing versus Developed recycled water system
• Weighing Customer and IRWD priorities

– Customers:

• r

– IRWD: psi, velocities, tanks, pumps, PRVs…

• Need to determine:

1. What impacts will adding a customer have? 2. Are the impacts within IRWD criteria? 3. Are there system improvements needed?

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Customer Demands Usage Patterns

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Darrin Park Recycled Water Conversion Customer Characteristics

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Customer Location Lake Forest Zone A-B Pump Station Lake Forest Zone B Tank

System Verification

• Dynamic Pressures > 40 psi
• Pipe Velocity < 8 fps MDD
• Tank Levels
• Pump Modifications

Customer Characteristics

• Located in Lake Forest Zone B
• Usage = 12.6 AFY
• Two 2” Turbo Meters with 250 gpm

capacity each (500 gpm total)

• Active during peak hours from

9PM – 6AM

Usage Pattern

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• Usage Pattern = 1 from 9 PM – 6 AM
• Model Demand = 1 x 500 gpm = 500 gpm
• Total mgd = 270,000 gpd

Lake Forest Zone A-B Pump Station Flows Time Of Use On / Off

7 500 1000 1500 2000 2500 3000 00:00 hrs 00:30 hrs 01:00 hrs 01:30 hrs 02:00 hrs 02:30 hrs 03:00 hrs 03:30 hrs 04:00 hrs 04:30 hrs 05:00 hrs 05:30 hrs 06:00 hrs 06:30 hrs 07:00 hrs 07:30 hrs 08:00 hrs 08:30 hrs 09:00 hrs 09:30 hrs 10:00 hrs 10:30 hrs 11:00 hrs 11:30 hrs 12:00 hrs 12:30 hrs 13:00 hrs 13:30 hrs 14:00 hrs 14:30 hrs 15:00 hrs 15:30 hrs 16:00 hrs 16:30 hrs 17:00 hrs 17:30 hrs 18:00 hrs 18:30 hrs 19:00 hrs 19:30 hrs 20:00 hrs 20:30 hrs 21:00 hrs 21:30 hrs 22:00 hrs 22:30 hrs 23:00 hrs 23:30 hrs 24:00 hrs

Flow (gpm)

Future Maximum Day Demand: Lake Forest Zone A-B Pump Station Flows

TOU On TOU Off Time Of Use 12:00 PM – 6:00 PM

Lake Forest Zone B Tank Recovery

8 24 25 26 27 28 29 30 31 00:00 hrs 00:30 hrs 01:00 hrs 01:30 hrs 02:00 hrs 02:30 hrs 03:00 hrs 03:30 hrs 04:00 hrs 04:30 hrs 05:00 hrs 05:30 hrs 06:00 hrs 06:30 hrs 07:00 hrs 07:30 hrs 08:00 hrs 08:30 hrs 09:00 hrs 09:30 hrs 10:00 hrs 10:30 hrs 11:00 hrs 11:30 hrs 12:00 hrs 12:30 hrs 13:00 hrs 13:30 hrs 14:00 hrs 14:30 hrs 15:00 hrs 15:30 hrs 16:00 hrs 16:30 hrs 17:00 hrs 17:30 hrs 18:00 hrs 18:30 hrs 19:00 hrs 19:30 hrs 20:00 hrs 20:30 hrs 21:00 hrs 21:30 hrs 22:00 hrs 22:30 hrs 23:00 hrs 23:30 hrs 24:00 hrs

Level (ft)

Future Maximum Day Demand: Lake Forest Zone B - 24 Hour Tank Levels

TOU ON TOU OFF Tank Level = 28.6’ Tank Level = 24.6’

10 30 50 70 90 110 130 150 00:00 hrs 00:30 hrs 01:00 hrs 01:30 hrs 02:00 hrs 02:30 hrs 03:00 hrs 03:30 hrs 04:00 hrs 04:30 hrs 05:00 hrs 05:30 hrs 06:00 hrs 06:30 hrs 07:00 hrs 07:30 hrs 08:00 hrs 08:30 hrs 09:00 hrs 09:30 hrs 10:00 hrs 10:30 hrs 11:00 hrs 11:30 hrs 12:00 hrs 12:30 hrs 13:00 hrs 13:30 hrs 14:00 hrs 14:30 hrs 15:00 hrs 15:30 hrs 16:00 hrs 16:30 hrs 17:00 hrs 17:30 hrs 18:00 hrs 18:30 hrs 19:00 hrs 19:30 hrs 20:00 hrs 20:30 hrs 21:00 hrs 21:30 hrs 22:00 hrs 22:30 hrs 23:00 hrs 23:30 hrs 24:00 hrs

Pressure (psi)

Future Maximum Day Demand: Darrin Park 24 Hour Pressures

Before After

Darrin Park Pressures Before and After Conversion

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Min = 107 psi Min = 39 psi

Model System Verification

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Darrin Park Model size = 4”

• As-built research
• Potholing

6” 4”

Darrin Park Pressures Pipe Diameters Increase from 4” to 6”

11 80 90 100 110 120 130 140 00:00 hrs 00:30 hrs 01:00 hrs 01:30 hrs 02:00 hrs 02:30 hrs 03:00 hrs 03:30 hrs 04:00 hrs 04:30 hrs 05:00 hrs 05:30 hrs 06:00 hrs 06:30 hrs 07:00 hrs 07:30 hrs 08:00 hrs 08:30 hrs 09:00 hrs 09:30 hrs 10:00 hrs 10:30 hrs 11:00 hrs 11:30 hrs 12:00 hrs 12:30 hrs 13:00 hrs 13:30 hrs 14:00 hrs 14:30 hrs 15:00 hrs 15:30 hrs 16:00 hrs 16:30 hrs 17:00 hrs 17:30 hrs 18:00 hrs 18:30 hrs 19:00 hrs 19:30 hrs 20:00 hrs 20:30 hrs 21:00 hrs 21:30 hrs 22:00 hrs 22:30 hrs 23:00 hrs 23:30 hrs 24:00 hrs

Pressure (psi)

Future Maximum Day Demand: Darrin Park 24 Hour Pressures

Before After Min = 112 psi Min = 88 psi

Conclusions / Recommendations

1. Lake Forest Zone A-B PS – Additional run time through TOU to maintain Lake Forest Zone B Tank Levels at 28’. 2. Verify pipe sizes near Darrin Park

• 4-inch pipes near Darrin Park = 39 psi
• Increase booster pump supply
• Upsize system pipes
• 6-inch pipes near Darrin Park = 88 psi
• Increase booster pump supply

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