Eddie Van Giesen RainCycle Rainwater National Sales Manager. Watts

Transcription

1 Eddie Van Giesen RainCycle Rainwater National Sales Manager Watts

2 Unusual Screening Strategy

3 For Friends Only

4 Soft landing?

5 Moral of the story Know what you are doing and do it right!

6 Rainwater harvesting Is this it? 6

7 It can be as simple as a 75 gallon rain barrel

8 Or as sophisticated as 33,000 gallon fiberglass tank

9 Advance Ed, Alpharetta, GA

10 Fact: Rainwater is not: Recycled water. Reclaimed water. Reused water. Graywater Rainwater is: Primary source of water Precipitation that has not been used

11 Current Water Supply Paradigm Municipal Potable Supply Line represents an unlimited supply of Potable water for all end uses. Building/Site all end uses treated equally

12 New Water Supply Paradigm Building/Site Requiring Water Supply Municipal Potable supply line Non Potable (Rainwater) supply line for non potable uses, represents a finite amount.

13 Two approaches to rainwater/stormwater Cistern managed for water supply management Cistern managed for stormwater control preceding storm event.

14 Combined Sewer Overflow Dry Dry weather Weather Wet Weather Downspout Downspout Storm drain Storm drain Dam Outfall pipe to river Dam Outfall pipe to river

15 One of the most frequently asked questions is: What is the economic return (or ROI) of a rainwater system? Current Formula: Cost RWH Cost MW = ROI Where: Cost RWH = cost of rainwater harvesting system ($) Cost MW = cost of municipal water over time ($) ROI = return on investment ($) Designing Rainwater Harvesting Systems, 2014, Wiley

16 A better formula would be: A better ROI formula on RWH would be: Cost RWH Cost MW ED PP RR SI HT MF BA MB = ROI where Cost RWH = cost of rainwater harvesting system ($) Cost MW = cost of municipal water over time ($) ED = costs associated with environmental degradation ($) PP = costs associated with pollution prevention ($) RR = costs associated with river restoration ($) SI = costs associated with stormwater infrastructure ($) HT = increase in tax rates ($) MF = municipal fees ($) BA = costs associated with the increase in buildable area ($) MB = costs associated with market branding ($) Designing Rainwater Harvesting Systems, 2014, Wiley

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18 What is a rainwater system? You do the rainwater system, I ll do the pumps, controls and filtration.

19 What is a rainwater system? You do the storage tank and pre filter, I ll do the rainwater system.

20 I got a better idea! I got a better idea! Why don t we build a system that includes everything needed from collection to the end use?

21 What is a rainwater system and who is involved? Is there one agreed upon definition? A rainwater system should be everything involved in collecting, storing, treating, pressurizing and distributing rainwater from the inlet pipe to the end use.

22 The Five Basic Elements of an Integrated Rainwater Harvesting System Collection Conveyance Prefiltration Storage Pump/Treat Rainwater System

23 Example of a well thought out plan sheet Site layout Storm Leader details Tank Section Mechanical civil overlap

24 System Anatomy Rainwater systems involve both Civil and Mechanical Engineers Coordination is key

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26 Cistern Sizing Monthly Demand Collection surface Potential Rainfall Cistern Design/Sizing

27 Catchment area Regardless of the pitch, the shape, or the complexity of the roof surface, the overall footprint of the roof determines the collection area.

28 Backing up a Rainwater System while protecting the drinking water lines Use an Air Gap Protected Direct Inject

29 By pass Option for critical uses

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35 Rainwater Control Stations Bus Washing Indoor toilet flushing

36 Remember that the skid will deliver a certain GPM at a Certain Pressure 1. GPM s on outflow 2. GPM s on inlet to pre filter 3. Pressure (TDH) 4. End uses (specific) 5. Electric service 208, 460v etc. 6. Cistern Type and size 7. Space limitations in Mechanical room 8. Roof material type (metal, membrane, asphalt etc.) 9. Demand volume

37 Inlet from Cistern Line Voltage Connection

38 Skid with Chlorine and Dye Control Panel DyeTank Chlorine Tank

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40 What is the Purpose of an Inlet Pre Filter? To filter the coarse material and prevent it from contaminating the tank water Typical pore sizes on the screen range from 350 micron to 1000 micron Critical component of a rainwater system and the absence of one increases maintenance on the tank and can cause the rainwater system to fail

41 Selecting an Inlet Pre Filter Determine area for collection Determine line size to filter Determine whether the filter is located inside the building or out

42 Two major types of Inlet Pre filters All filters are variations on a theme Screens relying on gravity for conveyance In from Roof In from Roof Overflow Filter body w/ External Overflow Filter body w/internal Overflow Filtered Water to Storage Filtered Water to Storage

43 How Do They work Many styles Not all manufacturers have comparable sizes Analyze the flow vs filter flow rates Pay Attention to the body Style Some suited for indoor application and some not

44 Inline filter with Internal Overflow Flow Flow Overflow to tank when flows exceed filter rate Flexible Coupling Filter Body Flow Flow Flow Flexible Coupling

45 Sloped screen Filter w/ External Overflow Finished Floor or Grade Line Slow velocity here In Flow From Roof Pressurized Line Screen Spray Nozzle Filter Body Removable lid for cleaning Filter Screen Invert Differential Y Over Flow X Filtered Flow to Tank Water Drops Down or Angles towards tank

46 Hydraulic Jump Style Filter with External Overflow Removable lid for cleaning X Invert Differential In Flow From Roof FilteredFi Filtered Water Flow to Tank Tank Filter Body Filter Screen Over Flow Invert Differential Y

47 Cascade Style Filter with External Overflow Removable lid for cleaning In Flow From Roof Filter Body Filter Screen Invert Differential Y Over Flow X Filtered Flow to Tank Filtered Flow to Tank

48 Basket filter with External Overflow Finished Floor or Grade Line Slow velocity here Removable lid for cleaning Filter Body In Flow From Roof Over Flow Invert Differential Y Filter basket X Filtered Flow to Tank

49 Baffel Box with Zero Invert Difference Filtered Flow to Tank Removable lid for cleaning Finished Floor or Grade Line In Flow From Roof Filter Body Out Flow to End Use Slow velocity here Over Flow Bafel Trap Debris Must be Physically removed between rain events

50 Inlet Filters Hydraulic Jump Cascade Style Vortex style 88

51 Bafle Box Traps Debris in an Aqueous Solution Not Good for Rainwater Systems unless Box is cleaned frequently More suitable for Typical Civil Solutions % Suspended Solids Removal Box can be breeding ground for Bacteria and vectors

52 Selecting the Right One Indoor Location or Out of the building Convenient access for Maintenance (Weight) Floor Drain to handle spills Slow Down Velocity up stream of Filter Run Pressure Line for self cleaning Nozzle Bypass?

53 Performance Comparison All should handle full flow of Pipe based on local codes for storm event sizing Filtered Flow rate is a different equation

54 Hydraulic jump Filter How It Works Inspection Hatch Filter Inlet Screen Cleaning Hydraulic Jump Filter Accepts to Tank

55 Cleaning a Graf Filter

56 In ground basket style pre filter

57 Factors to Consider Type Filter Mesh Size External Overflow Indoor Application Internal Overflow Outdoor Application In Line Down Pipe 400 No Yes Yes Vortex 380 Yes Conditional No Conditional Cascade 350 Yes Conditional No Conditional Hydraulic Jump 800 Yes Conditional No Conditional Tilted Screen 700 Yes Conditional No Conditional Down Spout 1000 No Yes

58 Layout Considerations Direct Bury External Down Spout Internal Storm Riser In Ground In Vault Over Tank

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64 Screen ripped from water force

65 Result of no pre filtration

66 After Cleaning

67 Arena St Michel Montreal Inlet Pre Filters Tanks

68 Inlet Pre filter

69 Tanks and Piping

70 Tanks

71 Great Story for the City

72 We all want you to go from this

73 To this!

74 Thank you! G. Edward Van Giesen (Eddie) Watts Water Technologies