Coming and Going An Overview of Infrastructure Common to Water Distribution and Wastewater Collection Systems

Transcription

1 Coming and Going An Overview of Infrastructure Common to Water Distribution and Wastewater Collection Systems Eric A. Smith, P.E. November 14, 2016 Raleigh, NC

2 Agenda Introduction Importance of Distribution/Collection Infrastructure Water Distribution Infrastructure Wastewater Collection Infrastructure Recap Questions 2

3 Introduction

4 Who Am I? Eric Smith, P.E. Project Engineer at CDM Smith Graduated from University of Central Florida B.S. Civil Engineering B.S. Environmental Engineering Relevant Experience Past 4 years designing water distribution/wastewater collection systems 4

5 Importance of Distribution/Collection Infrastructure

6 Water/Wastewater Infrastructure Clean water is essential to life and everyday functions Treating and disposing of wastewater is essential to health, sustainability, and environmental responsibility Hundreds of millions of dollars is invested in water/wastewater infrastructure in North Carolina on a yearly basis So much time and money is put into the infrastructure, yet it somehow goes largely unnoticed by the general public 6 When the well s dry, we know the worth of water. -Benjamin Franklin

7 Hidden Infrastructure Concept of out of sight, out of mind Majority of infrastructure is out of the public eye to begin with (i.e. buried pipe) Major infrastructure such as storage tanks and pump stations are difficult to disguise Every project has a certain degree of aesthetics in mind but some go above and beyond 7

8 8 Pump Stations

9 9 Ground Storage Tanks

10 Elevated Storage Tanks 10 Photos courtesy of Landmark

11 Elevated Storage Tanks Alternative Interior Use 11

12 Water Distribution Infrastructure

13 Example Projects Overview Western Cary Water Storage Tank Owner: Town of Cary, NC Contract 1: Elevated Storage Tank & Booster Pump Station 2.0 MG Elevated Storage Tank 3.0 mgd Booster Pump Station Contract 2: Water Main Improvements 1,200 linear feet 20-inch diameter water distribution main 3,600 linear feet 16-inch diameter water distribution main 1,900 linear feet 12-inch diameter water distribution main North Fayetteville Water System Improvements Project Owner: Fayetteville PWC Contract 1: 400,000 Gallon Elevated Tank & Booster Pump Station 400,000 gallon Elevated Storage Tank 1.0 mgd Booster Pump Station Contract 2: Water Main Improvements 7,700 linear feet 16-inch diameter water transmission main 13

14 Project Infrastructure Overview Elevated Storage Tank Multi-column Composite/Hydropillar Pump Station Custom Prefabricated Distribution/Transmission Pipe Valves Gate Air Release Check Flow Meter Specialty Valves Pump Control Surge Relief Altitude Pressure Reducing Instrumentation/Monitoring Miscellaneous Bleed line Interconnections 14

15 Elevated Storage Tank Western Cary Water Storage Tank 2.0 MG Composite or Hydropillar 164 to HWL Critical piping/valves located in pedestal Shallow foundation North Fayetteville Water System Improvements 2.0 MG Multi-Column 144 to HWL Critical piping/valves located in valve vault Pile foundation 15

16 Elevated Storage Tank Purpose Equalize supply and demand Decrease power costs Provides emergency storage Fire flow Design Considerations Operation Required Volume Overall Height (FAA) Types Multi-Column 1 Pedesphere 1 Composite 2 Fluted Column Steel Tank Institute & Steel Plate Fabricators Association: 2. CB&I Composite Elevated Tank Brochure

17 Pump Station Western Cary Booster Pump Station 1,800 gpm Vertical turbine pumps Expandable North Fayetteville Water System Improvements 1.0 MGD Pre-fabricated pump station 17

18 Pump Station Types High Service Used to pump treated water from treatment plant into distribution system Booster Station Used to boost pressures in the distribution system Design Considerations Operating scenarios Design flow Pump Type Types Engineer Designed Number/Size of Pump(s) Type of building Emergency Operation Pre-fabricated 18

19 Wastewater Distribution Infrastructure

20 Example Project Overview Brevard Neely Road Wastewater Improvements Owner: City of Brevard, NC Contract 1: Pump Station and Equalization 3.2 MG Equalization Tank 7.0 mgd Pump Station Contract 2: Force Main 12,000 linear feet 20-inch diameter sanitary sewer force main 20

21 Project Infrastructure Overview Equalization Tanks Ground Storage Pump Station Wet Well Submersible Force Main Valves Plug Sewage Air Release Check Flow Meter Specialty Valves Surge Relief Flow Control Instrumentation/Monitoring Miscellaneous Channel Grinder 21

22 Equalization Storage Tank 3.2 MG volume Prestressed Concrete Ground Storage Wet-weather storage Potential for future mixing Pile foundation Combination of gravity and pumps to drain 22

23 Equalization Storage Tank Purpose Equalize to avoid oversizing treatment units Decrease power costs Design Considerations Operation Wet Weather vs. Diurnal Required Volume Construction Prestressed vs. Cast-in-place Odor Control Wash down Location 23

24 Pump Station 7.0 mgd Flow range: 500 gpm to 4,670 gpm Four (4) submersible pumps (2) at 60 hp (2) at 200 hp Wet-well with above ground valve room 24

25 Pump Station Types Lift Used in gravity systems to lift wastewater into next leg of a gravity collection system (Screw pumps) Wet-pit/Dry-pit Pumps and wastewater are separated Coupled with force main Submersible Pumps are submerged in wastewater Coupled with force main Design Considerations Flow variations Regulate flow to treatment plant Contents of wastewater 25

26 Recap

27 Recap Importance of Distribution/Collection Infrastructure Water Distribution Infrastructure Wastewater Collection Infrastructure 27

28 Questions?