10.0 Integrated Stormwater Management Planning

Question 1

An Integrated Stormwater Management Planning is important to…

Answer 1

• Reduce the quantity (volume) of urban surface runoff
  
  • Strive for high-quality water to protect our receiving waters
  • Return rainwater where possible to natural watershed pathways using best management practices (rain garden, absorbent soils, and landscapes)
  • Raise awareness of the importance of stormwater management to become a resilient community in the face of climate change

Question 2

What is Integrated Stormwater Management?

Answer 2

• Treating stormwater as a resource
  
  • Greening our urban land use and streets
  • Returning stormwater to natural pathways
  • Green infrastructure tools for stormwater management

Question 3

Benefits and Impact on water of Absorbent Landscapes

Answer 3

1. Intercept and clean rainwater through soil pores, allowing gradual infiltration into subsoils to recharge groundwater
   • infiltrate

Question 4

Benefits and Impact on water of
Infiltration swales

Answer 4

1. Reduce runoff volume and increase water quality by capturing, detaining, treating, and conveying stormwater
   • Infiltrate
   • treat
   • detain

Question 5

Benefits and Impact on water of
Rain gardens and infiltration bulges

Answer 5

1. Reduce runoff volume and improve water quality by infiltrating, capturing and filtering stormwater. An overflow conveys extreme rainfall volumes
   • Infiltrate
   • Treat
   • detain

Question 6

Benefits and Impact on water of
Pervious paving

Answer 6

1. Reduce runoff volume and improve water quality by infiltrating and treating stormwater while still providing a hard, drivable surface
   • infiltrate

Question 7

Benefits and Impact on water of
Green roofs

Answer 7

1. Reduce stormwater peak flows and volume, depending on depth of growing medium
   
   2. Benefit building by providing insulation and by reducing the heat island effect
   3. Provide urban habitat
   • Detain
   • Habitat
   • transpire

Question 8

Benefits and Impact on water of
Tree well structures

Answer 8

1. Adequate soil volume will retain excess stormwater and help to remove pollutants from stormwater runoff
   
   2. Support a healthy tree canopy which intercepts rainfall
   • Infiltrate
   • Treat
   • Detain
   • transpire

Question 9

Benefits and impact of stormwater harvesting

Answer 9

1. Runoff roof surfaces can be captured, stored and used for non-portable uses like landscape irrigation, laundry, and toilets
   • Detain
     *Capture and reuse

Question 10

Benefits and impact on infiltration trenches

Answer 10

1. Reduce the volume and rate of runoff by holding and infiltrating water into subsurface soils
   
   2. Water quality pre-treatment is advisable
   • Infiltrate
     detain

Question 11

Benefits and impact of water quality structures

Answer 11

1. Capture hydrocarbons, coarse grit and coarse sediment
   
   2. Provide some water quality benefits except for soluble nutrients and pollutants

treat

Question 12

Benefits and impact of detention tanks

Answer 12

1. Reduce flooding and in-stream erosion by collecting and storing stormwater runoff during a storm event, and releasing it at a controlled rates to the downstream drainage system

detain

Question 13

Benefits and impact of daylighted streams & channel improvements

Answer 13

1. May provide in-stream detention water quality improvements, and essential habitat for aquatic life
   
   2. Contribute to the liveability of an area and establish a sense of place if properly designed
   • Detain
   • Habitat
     treat

Question 14

Benefits and impact of constructed wetlands

Answer 14

1. Provide detention, storage, habitat, and treat stormwater runoff through natural processes prior to discharging it into the downstream drainage system
   • Detain
   • Habitat
     treat