1. WaterSilos The Ultimate Storage Solution www.waterSilos.info

2. Existing Stormwater Infrastructure Storm drain conveys polluted stormwater runoff to receiving waters and the ocean! Violates NPDES permit Looses precious water Is unsustainable Leaves millions of acres of space below public ROW idle Storm Drain Idle Public ROW

3. Proposed Stormwater Infrastructure WaterSilos capture and store stormwater runoff for treatment and reuse Meets NPDES permit Stores and reuses precious water Is a smart sustainability move Makes best use of the idle space below public ROW Storm Drain Separator WaterSilo Diversion Valve Pipe

4. What is a WaterSilo? A vertical hollow shaft constructed underground using proven augur drilling technology Proven construction technology Does not require land Small footprint Rapid construction Diameters up to 30 ft and depths up to 200 ft Storage units of 10,000 to 200,000 gallons Unlimited system storage capacity

5. WaterSilo System Components Diversion Manhole Diverts the stormwater runoff at a design flow Hydrodynamic Separator Screens out the debris and suspended particles from the diverted stormwater

6. WaterSilos System Components Submersible Pump Pumps the stored water out for treatment and reuse Connection Pipe Connects consecutive WaterSilos to integrate the storage system

7. WaterSilos System Components Roadside/Median Bioswale Receives the stored water and treats it for reuse Roadside/Median Infiltration Trench Receives the stored water and infiltrates it for groundwater recharge

8. WaterSilos System Sizing 1.Calculate the total volume of storage required 2.Identify range of feasible WaterSilo diameters and depths per local constraints 3.Calculate water storage attainable per WaterSilo 4.Determine number of WaterSilos needed 5.Calculate available fill time and design diversion flow rate 6.Determine number of WaterSilos per diversion 7.Perform hydraulic calculations to size the diversion pipes, hydrodynamic separator, and WaterSilo connection pipe

9. WaterSilos System Costs – Silos

10. WaterSilos System Costs* – Total * 1.0 million Gallon Hypothetical WaterSilo Storage System comprised of twenty 12-ft diameter 60-ft deep WaterSilos with Grouted CMP Liners, three diversion structures and hydrodynamic separators, and one submersible pump

11. Terms of Use WaterSilos is a patent-pending Intellectual Property (IP) of SEITec corporation. It's use requires explicit written authorization and payment of a royalty fee SEITec Owners: Written authorization permits an owner to advertise a WaterSilos project for open bid or to commission the construction of a WaterSilos project. Design-Build Contractors: Written authorization permits a design-build contractor to propose, design, and build the system for utilities and owners that do not have WaterSilos authorization. Retail: Written authorization serves as permission for retail enterprise owners and managers to offer the WaterSilos system for sale through their distribution outlets, in exchange for an agreed upon compensation. Third Parties: Written authorization permits third parties to promote and market WaterSilos to potential customers in exchange for an agreed upon compensation.

12. WaterSilos System Simple Does not requires land Relatively minimal planning Minor construction Small footprint Gravity diversion Minimum stakeholder outreach and permitting Significantly lower cost Widespread practical application Short lead time

13. Q&A