Sustaintech 2016 Presented by: ANDREW CHAN Presentation Overview - - PowerPoint PPT Presentation

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Sustaintech 2016 Presented by: ANDREW CHAN Presentation Overview - - PowerPoint PPT Presentation

Dec 25, 2023 18 likes •510 views

2016.04.12 Sustaintech 2016 Presented by: ANDREW CHAN Presentation Overview Water Supply & Demands Climate Change Urbanization Impacts Stormwater Re use Re use Examples TAPPING INTO A STORMWATER RE-USE POTENTIAL

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Presented by:

Sustaintech 2016

ANDREW CHAN 2016.04.12

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Presentation Overview

TAPPING INTO A STORMWATER RE-USE POTENTIAL

  • Water Supply & Demands
  • Climate Change
  • Urbanization Impacts
  • Stormwater Re‐use
  • Re‐use Examples
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TAPPING INTO A STORMWATER RE-USE POTENTIAL

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Presentation Overview

TAPPING INTO A STORMWATER RE-USE POTENTIAL

Stormwater Irrigation Water Conservation Stormwater Mitigation

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Water Supply & Demand

  • Water is plentiful in the Prairies
  • But not where it is needed
  • Majority of population is in the southern portions of the

provinces

  • Low water yield in southern basins
  • High water yield in northern basins

TAPPING INTO A STORMWATER RE-USE POTENTIAL

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TAPPING INTO A STORMWATER RE-USE POTENTIAL

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Statistics Canada 2016

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Increasing Water Demands

Growing Populations

TAPPING INTO A STORMWATER RE-USE POTENTIAL

Growing Water Demand

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Increasing Water Demands

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Infrastructure Demands

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Climate Change and Water Supply

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Folsom Lake, CA ‐ 2011 and 2014

(California Department of Water Resources)

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Climate Change and Water Supply

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Bow Glacier recession since 1898 (BRBC)

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Urbanization

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Stormwater Re‐use for Irrigation

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TAPPING INTO A STORMWATER RE-USE POTENTIAL

Stormwater Re‐use for Irrigation

% Imp Runoff ET Shallow Inf Deep Inf 10% 40% 25% 25% 10‐20 20% 40% 20% 20% 35‐50 30% 35% 20% 15% > 75 55% 30% 10% 5%

Impervious Cover & Urban Water Balance

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Nuisance Flooding & Major Floods

Stormwater Impacts

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Water Quality

Stormwater Impacts

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Water Quality

Stormwater Impacts

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Stream Morphology 10% Impervious Threshold

Stormwater Impacts

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Stormwater Management Rainfall Spectrum

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Drivers in Calgary

Total Loading Management Plan (Wastewater & Stormwater)

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Total Suspended Solids

92% 8%

BOD

60% 40%

Nitrate/Nitrite

Stormwater

Ammonia

5% 95% Treated Wastewater Effluent

TKN

15% 85%

Total Phosphorus

18% 82%

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Drivers in Calgary

  • Stormwater Approval Criteria

– Runoff Rate for Design Flows – Water Quality Treatment (TSS) – Mean Annual Runoff Volume Targets (as low as 11 mm)

TAPPING INTO A STORMWATER RE-USE POTENTIAL

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Statistics Canada 2016

TAPPING INTO A STORMWATER RE-USE POTENTIAL

Mean Annual Runoff Yield

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Solutions

  • Reduce runoff and pollutant loading at the source

– Low Impact Development / Source Volume Controls

  • Water Quality Best Management Practices (OGS)
  • Storm sewers & Stormwater Management Facilities

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Solutions

  • Re‐use treated stormwater as a resource for irrigation onto

the urban landscape

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Stormwater Re‐use for Irrigation

  • How much water can we use to Irrigate?
  • 25 mm / week? 550 mm / yr
  • 30 mm / week? 660 mm /yr
  • What will the soil / vegetation need?
  • ET plus Rainfall (325 – 400 mm/yr)
  • How does it impact stormwater design

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Water Reuse in Canada

  • Types of reuse

– Rainwater Harvesting – Stormwater Harvesting – Greywater – Treated Effluent – Blackwater – Restricted Irrigation – Unrestricted Irrigation

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Stormwater Reuse Examples

TAPPING INTO A STORMWATER RE-USE POTENTIAL

Source: (http://www.ionirrigation.com/experience/inland_athletic_park.pdf)

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Stormwater Reuse Examples

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Stormwater Reuse Examples

  • Calgary Telus Spark

Science Centre

  • Ralph Klein Legacy Park /

Sheperd Wetland

  • All New Planned

Communities in Calgary…

TAPPING INTO A STORMWATER RE-USE POTENTIAL

  • Baker Park
  • Bowness Park
  • Prince's Island Park
  • Valley View
  • Savanna
  • Cornerstone
  • Rangeview…
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TAPPING INTO A STORMWATER RE-USE POTENTIAL

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Irrigation Demand Estimation Tool (IDET)

  • A planning tool that

estimates the irrigation demand required to keep vegetation happy and healthy.

  • Use historical data to

assist with continuous simulation modelling (50 years)

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Calgary Irrigation Demand Estimation Tool (IDET)

  • Standardized approach /

consistency in assumptions

  • Analysis that satisfies both

The City’s Water Resources and Parks Water Management

  • Streamline the review

process

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Irrigation Demand Estimation Tool (IDET)

  • Similar to Ag. irrigation

scheduling but for an urban application for urban plants and landscapes

  • Infrastructure & Land

Requirements

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Irrigation Demand Estimation Tool (IDET)

  • IDET calculates the volume
  • f water necessary to

replenish lost moisture from soils using site specific parameters.

TAPPING INTO A STORMWATER RE-USE POTENTIAL

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Irrigation Demand Estimation Tool (IDET)

Factors:

  • Soil characteristics (e.g., texture, depth, compaction);
  • Subsoil characteristics;
  • Plant species (type, density, microclimate) & rooting depth;
  • Water holding capacities;
  • Potential & Actual evapotranspiration;
  • Temporal variability of water demands;
  • Precipitation, wind speed, and temperature data;

TAPPING INTO A STORMWATER RE-USE POTENTIAL

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Irrigation Demand Estimation Tool (IDET)

Factors:

  • Irrigation method;
  • Equipment efficiencies;
  • Irrigation system management efficiencies; and
  • Other environmental factors (such as a reduction in AET

when the soil water content (SWC) is below the amount that is easily extracted from plants for purposes of transpiration).

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Irrigation Demand Estimation Tool (IDET)

  • Climate Data

– Precipitation Data

  • 50 Years of Hourly
  • 1960‐2009

– Evapotranspiration

  • 1960‐2009

– Wind Speed & Air Temperature

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Irrigation Demand Estimation Tool (IDET)

  • Size (ha or % of total area): Up to 15
  • Topsoil Type: 11 Pre‐defined
  • Topsoil Compaction Level
  • Vegetation Rooting Depth
  • Vegetation Type: 39 Pre‐defined
  • Vegetation Density

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Irrigation Demand Estimation Tool (IDET)

  • Micro‐climate Conditions
  • Subsoil Type: 11 Pre‐defined
  • Irrigation Method: 8 Pre‐defined
  • Other losses
  • Irrigation Schedule

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Irrigation Demand Estimation Tool (IDET)

  • Custom soil types

–Saturation –Field Capacity –Wilting Point –Saturated Hydraulic Conductivity

TAPPING INTO A STORMWATER RE-USE POTENTIAL

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Irrigation Demand Estimation Tool (IDET)

TAPPING INTO A STORMWATER RE-USE POTENTIAL

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Why IDET?

TAPPING INTO A STORMWATER RE-USE POTENTIAL

vs

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Why IDET?

TAPPING INTO A STORMWATER RE-USE POTENTIAL

  • Healthy landscapes
  • Conserve water / Reduce potable water use
  • Climate change resiliency
  • Hydrological health of wetlands
  • Recharge of groundwater
  • Meet stormwater goals to help:

– Reduce pollutant loads – Reduce rate of change of stream erosion

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Why IDET?

TAPPING INTO A STORMWATER RE-USE POTENTIAL

  • Appropriately sized stormwater and irrigation infrastructure

– Stormwater Wetponds design & land use requirements

  • Stormwater ponds may be reduced in size
  • but may grow to accommodate irrigation storage and provide

additional evaporation

  • Possible lower HWL
  • Stormwater pipes can be reduced in size

– Irrigation pump stations & distribution

  • Approvals of developments
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Results

TAPPING INTO A STORMWATER RE-USE POTENTIAL

Residential Land Use (110 ha, 55% impervious (16 mm target) Mean Annual Runoff (mm) Mean Annual Precipitation 409 Conventional Stormwater Management 156 Disconnect Impervious Areas (8% DCIA) & On‐site LIDs (Absorbent Landscaping & Bioretention Areas) 70 + Stormwater Reuse (Irrigation of park spaces) + Wetland replenishment to maintain natural hydroperiod 15

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Results

TAPPING INTO A STORMWATER RE-USE POTENTIAL

Light Industrial Land Use (37 ha, 85% impervious (40 mm target) Mean Annual Runoff (mm) Mean Annual Precipitation 409 Conventional Stormwater Management 196 Disconnect Impervious Areas (25% DCIA) & On‐site LIDs (Absorbent Landscaping & Bioretention Areas) 130 + Stormwater Reuse (Irrigation of 10% of catchment / park spaces) 52 + Stormwater Reuse (Irrigation of 10% of catchment / park spaces) + Wetland replenishment to maintain natural hydroperiod <31

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Cost Implications

  • $2.89/m3 (2015 Irrigation Water Usage Rate)
  • Irrigation Water Savings = $10,000 to $16,500 /ha/year

TAPPING INTO A STORMWATER RE-USE POTENTIAL

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Presented by:

Questions?

ANDREW CHAN