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 2

Project Background – Purpose & Goals • Why hydraulic modeling? • Developing versus Developed recycled water system • Weighing Customer and IRWD priorities – Customers: or – 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? 3

Customer Demands Usage Patterns 4

Darrin Park Recycled Water Conversion Customer Characteristics Customer Characteristics Lake Forest • Located in Lake Forest Zone B Zone B Tank • Usage = 12.6 AFY • Two 2” Turbo Meters with 250 gpm capacity each (500 gpm total) • Active during peak hours from 9PM – 6AM System Verification Lake Forest • Dynamic Pressures > 40 psi Zone A-B • Pipe Velocity < 8 fps MDD Pump Station • Tank Levels • Pump Modifications Customer Location 5

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

Flow (gpm) 1000 1500 2000 2500 3000 500 0 00:00 hrs Time Of Use On / Off Lake Forest Zone A-B Pump Station Flows Lake Forest Zone A-B Pump Station Flows Future Maximum Day Demand: 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 12:00 PM – 6:00 PM Time Of Use 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 TOU Off TOU On 22:00 hrs 22:30 hrs 23:00 hrs 23:30 hrs 7 24:00 hrs

Level (ft) 24 25 26 27 28 29 30 31 00:00 hrs Lake Forest Zone B Tank Recovery Lake Forest Zone B - 24 Hour Tank Levels Future Maximum Day Demand: 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 Tank Level = 24.6’ 17:00 hrs Tank Level = 28.6’ 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 TOU OFF TOU ON 22:00 hrs 22:30 hrs 23:00 hrs 23:30 hrs 8 24:00 hrs

Pressure (psi) 110 130 150 10 30 50 70 90 00:00 hrs Before and After Conversion Darrin Park Pressures Darrin Park 24 Hour Pressures Future Maximum Day Demand: 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 Min = 39 psi 05:30 hrs Min = 107 psi 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 After Before 23:00 hrs 23:30 hrs 24:00 hrs 9

Model System Verification Darrin Park 6” 4” Model size = 4” • As-built research • Potholing 10

Pressure (psi) 100 110 120 130 140 80 90 00:00 hrs Pipe Diameters Increase from 4” to 6” Darrin Park Pressures Darrin Park 24 Hour Pressures Future Maximum Day Demand: 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 Min = 88 psi 05:00 hrs Min = 112 psi 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 After Before 23:00 hrs 23:30 hrs 24:00 hrs 11

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 o  Increase booster pump supply  Upsize system pipes 6-inch pipes near Darrin Park = 88 psi o  Increase booster pump supply 12