Sustainable Water Sustainable Water InfrastructureInfrastructure

Ivy AndersonAndey Nunes

Primary Environmental ConcernsPrimary Environmental Concerns

Diverse water supply: right level of treatment for right use

Impacts of development on stormwater: discharge vs. recharge

Economically viable and climate adaptive wastewater treatment

goal is to create a water independent community in accordance with natural hydrology

Adequate Water Adequate Water SourcesSources

• Does the Urban Water Management Plan (required by SB610/SB221) incorporate diverse water sources? What diverse sources could reduce water supply demand in all conditions?Potable water only for potable uses: built-in adaptation infrastructure

20 year Water Supply considerations: rainwater for household non-potable use, graywater for landscape use, commercial/industrial re-use

Document water supplies available during normal, single dry, and multiple dry water years during a 20-year projection and the existing and projected future water demand during a 20-year projection. The Act requires that the projected supplies and demands be presented in 5-year increments for the 20-year projection.

50,000sf= lMG water

Water Supply DecisionsWater Supply Decisions

Diverse Water Sources: Diverse Water Sources: treatment appropriate for usetreatment appropriate for use

rainwater catchment for urban agriculture & other non-potable use

graywater (laundry to landscape)

potable water only for potable use

wastewater reclamation for industry, landscape, and other approved purple pipe

Sustainable Stormwater Sustainable Stormwater InfrastructureInfrastructure

• How can the stormwater impacts of development be minimized to protect water quality for existing habitat and surface waters?

Manage stormwater as close to the source as possible to reduce or eliminate the volume of water and pollutants leaving the site. Integrate stormwater in site development, building and landscape designs

Reduce impacts from impervious surfaces such as streets, parking lots, rooftops and other paved surfaces

Locate and design streets to protect stream corridors and reduce high flows and polluted runoff.

Impervious Surface ManagementImpervious Surface Management

green streets

smart development

impermeable surface charge to fund decentralized treatment systems

Synergy of Stormwater Management Synergy of Stormwater Management and Rainwater Catchment for non-and Rainwater Catchment for non-

potable use potable use

habitat creation

ecological education

landscape & recreation

industry

flushing toilets

Design decentralized, integrated systems of treatment and reuse of household wastewater.

Match water quality to need- reuse greywater for non-potable applications

Reduce consumption of virgin water sources

Can wastewater be properly treated and Can wastewater be properly treated and reused onsite in low-density residential reused onsite in low-density residential

zones?zones?

Decentralized Greywater SystemsDecentralized Greywater Systems

Source: http://www.environmentwriter.com/archives/tag/greywater

Low energy, low cost technique for removing phosphates, nitrogen, and other contaminants from wastewater before reuse or discharge into bay.

Reuse of properly treated wastewater for landscaping and other non-potable uses.

Preservation and protection of open space and vulnerable wetland habitat

Educational and recreational opportunities for our community

Can wastewater from the high density Can wastewater from the high density commercial zone be integrated into a commercial zone be integrated into a

centralized constructed wetland for proper centralized constructed wetland for proper treatment?treatment?

Source: epa.gov

Constructed Wetlands: Wastewater Treatment and Constructed Wetlands: Wastewater Treatment and Reclaimed Water ProductionReclaimed Water Production

Can wastewater infrastructure also be used to Can wastewater infrastructure also be used to mitigate some of the negative impacts of climate mitigate some of the negative impacts of climate change and ensure emergency preparedness in change and ensure emergency preparedness in

our community?our community?

Constructed Wetlands & Sealevel rise

Saltwater intrusion

Mitigating impacts of increased storm events and surface water runoff

Conservation of potable water sources for drought years.