Stormwater Harvesting in the Bronx 2013 SESWA Annual Conference Charlotte, NC October 24, 2013

Transcription

1 Stormwater Harvesting in the Bronx 2013 SESWA Annual Conference Charlotte, NC October 24, 2013 Steve Kingsland (508)

2 Agenda Background Definition of Rainwater Harvesting Drivers Behind the Growth in Rainwater Harvesting System development process Typical Rainwater Harvesting System Components Forest House Background NYC & CSOs Project Background (drivers, parties involved, etc) Scoping & System Design Installation Future Additions to System Results 2

3 What is Water Harvesting? Water Harvesting is the collection, cleaning, storage and reuse of onsite water sources, to reduce the consumption of municipal potable water. Rainwater Stormwater Greywater Condensate Groundwater Reclaimed Water On-Site Treated Non-Potable Water From roofs and above-ground collectors From ground surfaces Parking lots, run-off Untreated waste water gently used in showers, sinks, processes From cooling system blower units or steam systems From below-grade sumps (around basements) Municipally-treated sewage for reuse Processed water from any source ready for non-potable reuse 2013 Water Harvesting Solutions, Inc. 3

4 We Use Potable Water for Everything Why? from: Peak Water: Aquifers and Rivers Are Running Dry. How Three Regions Are Coping By Matthew Power 4

5 Keep in Mind - much of the cost may already be required 5

6 Why Water Harvesting? A Water Crisis on the Horizon 2013 Water Harvesting Solutions, Inc. 6

7 A Water Crisis on the Horizon 2013 Water Harvesting Solutions, Inc. 7

8 Megatrends Support Water Harvesting Predicted Shortage of Potable Water Conservation Efforts The Green Movement Concern for Environment LEED Certification LID Stormwater Best Management Practices Detention Requirements 2013 Water Harvesting Solutions, Inc. 8

9 Why Does the Owner Want to Harvest? Save money on municipal water and sewer charges Convert stormwater liability into an asset Protect the environment Green building certification Regulatory requirements, incentives Higher property resale value Good public relations 2013 Water Harvesting Solutions, Inc. 9

10 LEED Certification is a Trend Driver Water Use Reduction (2-4 pts) 10 or more LEED points available with harvesting! LEED Certification Levels Innovative Wastewater Technologies (2 Pts) Water-Efficient Landscaping (2-4* Pts) Stormwater Design (2 Pts) Water Harvesting Solutions, Inc. 10

11 Harvesting Opportunity in Commercial Properties Evaporative Cooling Tower 1,500,000 gallons annually Toilet flushing 500,000 gallons annually Landscape irrigation 750,000 gallons annually Rooftop rainwater 500,000 gallons annually Cooling coil condensation 400,000 gallons annually Parking lot rainwater 2,000,000 gallons annually 2013 Water Harvesting Solutions, Inc. 11

12 Over 90% Potable Water Replacement for Some Facilities 90% + 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% Irrigation Cooling Towers Toilets &Urinals Other (Showers, drinking, kitchen, laundry, etc) Source: Australian Department of Natural Resources, Mines and Water,

13 Development Process Touches Multiple Customers Scoping Design & Specifications Fabrication Installation & Testing Training, Service & Maintenance Architects/Engineers Contractors Mechanical & Civil Engineers Maintenance Staff 2013 Water Harvesting Solutions, Inc. 13

14 System Design Objectives Make a significant and meaningful impact on reducing the amount of municipal water use Match a system to meet the unique characteristics of the building Location, use, opportunities, local codes Ensure that the water is safe for application Keep the system as simple as possible Complexity adds up-front cost, maintenance, risk Keep the system cost as low as possible 2013 Water Harvesting Solutions, Inc. 14

15 Project Scoping Process Steps Evaluate and estimate potential supplies & demand Draft system concept sequence of operation Determine recommended storage amount & type Identify the system mechanical requirements Provide a rough system cost for building decision makers early in the process 2013 Water Harvesting Solutions, Inc. 15

16 Scoping: Evaluating Water Sources & Applications Potential Sources Rooftop rainwater Surface stormwater Greywater from showers, sinks, washers Cooling condensate Steam condensate Groundwater ejectors Cooling tower blow down Potential Uses Landscape irrigation Toilet flushing Cooling tower make-up Green roof irrigation Boiler make-up Truck washing Washing machines Process wastewater 2013 Water Harvesting Solutions, Inc. 16

17 Scoping: Processing Steps Added as Contaminants Increase Sources Condensate 10u filter, U.V. Processing Approach Increasing Contaminants and Processing Groundwater R/O Discharge Rainwater Reclaimed Water Stormwater 10u filter, U.V. 10u filter, U.V. Pre-filter (150u), Primary Filter (50u), Final filter (5 u), U.V. or Chlorine Pre-filter (150u), Primary Filter (50u), Final filter (5 u), U.V. or Chlorine, Carbon Filter (odor/color) Pre-filter (150u), Oil Separator/Absorption, Primary Filter (50u), Final filter (5 u), U.V. or Chlorine Greywater, Gray Water Settling Tank, Chlorine, Floating Filter (250 u) Primary Filter (70u), Final filter (10 u), U.V Water Harvesting Solutions, Inc. 17

18 Scoping: Matching Supply to Demand Revisit Supply Options to Balance Supply & Demand Average Demand Average Supply Municipal Make-Up Maximize This Number 2012 Water Harvesting Solutions, Inc

19 Cistern Modeling Identifies Optimal Rainwater Storage Capacity Different cistern size options are modeled using six years of daily rainfall history for the location Most cost-effective capacity is at point of diminishing returns 2012 Water Harvesting Solutions, Inc. 19

20 Typical System Components Primary Filtration Controls Processing Pressurization Storage 2012 Water 2012 Water Harvesting Solutions, Inc. Inc. 20

21 Agenda Background Definition of Rainwater Harvesting Drivers Behind the Growth in Rainwater Harvesting System development process Typical Rainwater Harvesting System Components Forest House Background NYC & CSOs Project Background (drivers, parties involved, etc) Scoping & System Design Installation Future Additions to System Results 21

22 New York City and CSOs 60% of sewers in NYC are combined sewers Rain of as little as.1 inches/hr results in CSO events According to NYC DEP: CSO capture rate has increased from 30% in 1980 to 80% today, by: Infrastructure improvements CSO detention facilities Green infrastructure NYC DEP has a broad effort to better manage stormwater Mayor Bloomberg s PlaNYC initiative and Sustainable Stormwater Management Plan encourages green infrastructure 22

23 Forest House, Bronx, NY Part of Mayor Bloomberg s $7.5B New Housing Marketplace Plan to provide affordable housing 9-story, energy efficient, precast concrete building, featuring: Affordable housing units Landscaped open space Underground parking Rooftop hydroponic greenhouse ~80, ,000 LBS fresh produce/year Distribution to residents and local markets 23

24 Forest House, Bronx, NY 0.7 acre site, 100% impervious, 100% serviced by CS 16,000 gallon SW control structure per NYC Street Connection rule Hydroponic greenhouse with up to 2,800 gpd water demand Funding opportunity 24

25 Forest House Project Overview Project: Location: Developer: Engineer: System Provider: System Type: Driver: Considerations: Storage: Sanitation: Projected Annual Water Savings: Forest House Bronx, New York Blue Sea Development Sideris Kefalis, Bayside, NY Oldcastle & Wahaso Rooftop Rainwater & Hardscape Stormwater, (22,600 square feet), for Irrigation Grant program & LEED Retention with detention requirement 16,000 Gallon underground (traffic rated) Ultra-violet 470, ,000 gallons Commissioning Date: Summer Water Harvesting Solutions, Inc. 25

26 Forest House Option Gal Above Elevator 26

27 Forest House Water Analysis Option Gallon Cistern 173,000 Gals Saved 16% Supply 27

28 Forest House Option 2 Over Elevator & Below Ramp 28

29 Forest House Option 2 Over Elevator & Below Ramp 29

30 Forest House Water Analysis Option 2 22,000 Gal Cistern 582,000 Gals Saved 50% Supply 30

31 Forest House Option 3 Below Ramp Only 16,000 Gal 31

32 Forest House Cistern Optimization Analysis Option 3 32

33 Forest House Water Analysis Option 3 16,000 Gal Cistern 463,391 Gals Saved 60% Supply Estimated Annual Savings: $.01239/Gal x 463,391 Gals = $5,742 33

34 Forest House System Schematic 2013 Water Harvesting Solutions, Inc. 34

35 Forest House 3 D Skid Drawings Pressurization Processing Skid 2013 Water Harvesting Solutions, Inc. 35

36 Forest House Installed System Control Screen Main Screen Booster Pump Adjust Screen Typical Controls: Monitor filters & pumps Provides reports Will integrate with building controls Remote monitoring available 36

37 Forest House Cistern Installation 37

38 Forest House Maintenance Considerations Downspout filters located at easily accessible points for easy/efficient cleaning 5 micron polishing filter backflushes itself UV bulb has 10,000-hour useful life change every year Automated wiper system keeps UV bulb in optimum effectiveness Multiple manway access points provided into both sections of modular cistern for future maintenance if required 38

39 Forest House Future Additional System Features What is the one weakness of Stormwater Harvesting? Full storage = no effect as stormwater control device Partially full storage = partially effective as stormwater control device 39

40 OptiRTC Detention Level Control Technology Resolves issue of detention capacity lost to retention OptiRTC Controller - integrates predictive weather information with real-time data and modeling capability. Predicts amount of detention required by approaching storms Releases only as much stored water as needed to achieve detention capacity New runoff is then detained in the storage system, reducing the incidences of CSOs to receiving waters 2013 Water Harvesting Solutions, Inc. 40

41 Forest House Active Controls Conversion to: Advanced Rainwater Harvesting Active Controlled Discharge with Automated Valve 2012 Water Harvesting Solutions, Inc. 41

42 Forest House Finished Project Online late July 2013 Active control system still pending DEP approval Harvested water is providing approximately 60% of greenhouse irrigation demands Project has received LEED Platinum certification 42

43 Acknowledgements Blue Sea Development Our Partners at Wahaso John Bauer Stuart Bailin 43

44 Thank You! Steve Kingsland (508) stormcapture.com 44