Water System Separation Programs RDNO s West Swan Lake Separation

Transcription

1 1 Water System Separation Programs RDNO s West Swan Lake Separation by Rod Pleasance, P.Eng. And Mike Eberts, P.Eng.

2 Introduction & Outline 2 Rod Pleasance, P.Eng. Regional District of North Okanagan (RDNO) RDNO s History What is a System Separation Why should RDNO Separate RDNO s System Separation Stages Mike Eberts, P.Eng. Kerr Wood Leidal & Associates, Ltd (KWL) West Swan Lake Separation Project: What is it? Who is Affected? Large Project with many Phases/Contracts Where does RDNO go from here?

3 RDNO s History 3 What Does RDNO Do; What s Its History? It Started with a Ranch 1892 Coldstream Ranch bought by Lord Aberdeen 1906 White Valley Irrigation and Power Company created started construction of Grey Canal

4 RDNO s History 4

5 RDNO s History 5

6 Steel Flume supported on one of the highest trestles within the Vernon Irrigation District. Built in Located between Goose Lake and Bella Vista. 6

7 Swan Lake Canal 26 wide concrete flume with 6 vertical side extensions 7

8 Flume from Gold Creek 8

9 RDNO s History 9 What Does RDNO Do; What s Its History? It Started with a Ranch 1892 Coldstream Ranch bought by Lord Aberdeen 1906 White Valley Irrigation and Power Company created started construction of Grey Canal 1920 Vernon Irrigation District received Letters Patent Late 60 s to 70 s Agricultural and Rural Development Act (ARDA) Projects Converted ditch system to pipes

10 Culvert through Aberdeen Lake Dam, October 30,

11 Goose Lake Dam- culvert from Old Kamloops Rd up hill - December

12 System Overview and Separation Areas 12

13 RDNO s History 13 What Does RDNO Do; What s Its History? It Started with a Ranch 1892 Coldstream Ranch bought by Lord Aberdeen 1906 White Valley Irrigation and Power Company created started construction of Grey Canal 1920 Vernon Irrigation District received Letters Patent Late 60 s to 70 s ARDA Projects Converted ditch system to pipes 2002 Master Water Plan recommends amalgamation of three water utilities into one and recommends separation of water systems 2003 GVWU formed by joining City of Vernon, District of Coldstream, and Vernon Irrigation District

14 What is a System Separation 14 What is a System Separation? Removing agricultural water from the treatment process Twinning of watermains (one raw, one potable) Services at each property must be connected to appropriate main

15 Why Separate? 15 Why does RDNO need to do one? - Master water plan of 2002 identified that in long term, it was better to separate systems rather than treating all of the water - Some sources are difficult to treat for drinking but are readily available for agricultural uses - Reduce peak demand on the Duteau Water Treatment Plant

16 RDNO s System Separation Stages 16 RDNO s Separation Stages - Completed - Bella Vista - Von Keyserlingk - South King Edward - In Progress - West Swan Lake - Binns - Springfield - Future - Depends on new Master Water Plan to come out later this year

17 Separation Areas 17

18 West Swan Lake Separation 18 Phases of the Project - Predesign Late Detailed Design Late Tendering Early Construction Summer of 2012 and 2013

19 Predesign 19 Predesign Objectives - Relieve Demand off of Duteau Water Treatment Plant - Over Capacity during summer months - New Water Source? - Swan Lake or Goose Lake Water is there, let s use it? - Pumpstation from Swan into Goose Lake - Environmental Impacts - Water Balance Issues and No Licenses - Too costly - BX Creek - Existing Licenses - 12km of watermain? - Too costly - Duteau Supply Main - Can the system handle it? - Separating Water with a Valve Station. - Considers Big Picture and Interim Condition

20 Predesign 20 Predesign - Water Source Delivery - High properties and low properties - Twinning with Four Pipes or Two Pipes with PRV Pits - Let s Model It - Obtained Asbuilt Information - Constructed WaterCAD Model - Calibration and Validation Program - Run scenarios to address pressure and fireflow requirements and develop design plans.

21 Predesign Chosen Option 21

22 Detailed Design 22 Detailed Design Goals - #1 System Conversion - Old main on west side of road will become irrigation/agricultural use only. - #2 Extend/Connect new Service - Twin Existing Watermain with 8km of new 250mm diameter Potable Watermain. - Install an additional 2km of watermain ranging from 75mm to 150mm diameter - Extend 7km of Services on Private Properties - Reconnect Resident s Services

23 Detailed Design 23 Detailed Design Goals - #3 Separate Water Sources - Construct Valve Station for Separation - Duteau Treated water from 750mm diameter supply main will supply both sources. - Continue to use Goose Lake as Balancing reservoir for irrigation. - #4 Simplify Pressure Zones - Decommission small/older problematic Pressure Zones - Create larger pressure zone for both systems. - Install PRV and meter Pits for each property to replace smaller reduced pressure zones.

24 Who is Affected? 24 People/Agencies Affected -RDNO s Customers Public Open House Urban Properties requiring Domestic Water; Rural Properties requiring Domestic and Agricultural Water; and Rural Farming Properties requiring Agricultural only. Interviews - City of Vernon - Constructing a Watermain under their road - Road Reconstruction - Ministry of Transportation - Constructing a Watermain under their road - Road Reconstruction - Directional Drilling Services - IHA - Constructing potable vs non-potable watermain

25 Large Project; Many Contracts 25 7 Contracts for West Swan Lake $8.8M for all works Split into contracts for competitive pricing Helps budget project over two years. Let s smaller/more local contractors bid on the work 7 Contracts total: 3 mainline contracts 3 private property connections contracts 1 valve station contract Increased engineering efforts but overall cost effectiveness and less risk

26 Where does RDNO go from here? 26 Final Touches - Final Commissioning of Valve Station Flow real-time water through Valve Station Fill Goose Lake with Freshet - Finish last two contracts Finish twinning of watermain Finish watermain services to the properties Connect up last few houses Make appropriate boundary tie-ins - Test the separated system Advisory and disconnect agricultural source to determine if any properties got missed Open up Goose Lake as a feeder and ensure no one got missed - Onto the Next Phase for RDNO

27 Questions? 27 Rod Pleasance, P.Eng. Project Engineer Regional District of North Okanagan Mike Eberts, P.Eng. Project Manager Kerr Wood Leidal April 23, 2012