importance of stormwater bmp inspection &...
TRANSCRIPT
Importance of Stormwater BMP
Inspection & Maintenance
Pat Sauer, Executive Director
Iowa Stormwater Education Partnership
Talking
Points
What are stormwater Best Management Practices (Stormwater Control Measures)?
More BMPs More Green Infrastructure
Program for public and private facilities
Who will inspect and maintain?
Inventory
Knowledge of the best management practices (Stormwater Control Measures), function
Regular inspections
Maintenance
Water quality control: rain gardens, bio-retention cells, bio-swales, native landscaping and permeable pavement systems
Flood control: detention basins, retention ponds & constructed wetlands
Some can do both
Relying on
BMPs for:
This is NOT
a BMP!
Pretreatment
Practices
Grass swales
Forebays
Separators/Filters
Sump systems, Rain Guardian
Design for ease of maintenance
Water Quality BMPs
Green Infrastructure
Rain Gardens
Common Stormwater
Runoff Pollutants
Sediment (NURP)
Bacteria (NURP)
Heavy Metals (NURP)
Trash “Floatables”
Cigarette Butts, floatables
Nutrients
Grass Clippings
“Garbage Juice”
Hydrocarbons
Thermal Pollution
Bioretention Cells
Bioswales
Green Roofs
Iowa City Moen Group
Retention Ponds (Wet Ponds)
Native Landscaping / Native Turf
Permeable Pavements
Charles City: 25 blocks
Rainwater Harvesting
Tree Filter Boxes
Flood Control Practices
Wet Ponds
Constructed Wetlands
Inspection & MaintenanceYour Community is Relying on These BMPs for Removal of Pollutants and Flood Control
What sort of program is needed to address:
• Water quality
• Flood control
Function
• Some provide recreation
• Habitiat
Aesthetics
Safety?
Start with an
Inventory
GIS map locations of all practices
with designation for private and
public, easements
Obtain Record Drawings/As-builts
Who Will Conduct Inspections?Who Will Do Maintenance?
There are Skilled Staff for Wastewater Treatment Plants
Trained operators of
systems
Regular inspections
and maintenance
HOAs?
Who will inspect and maintain?
Who ensures that this is done? Inspection reports
sent to City?
Who for Private BMPs?
Existing staff or contractors?
Public Works, Parks and Recreation, Streets,
Engineering
Knowledge of BMPs, plants, hydraulic function,
maintenance procedures, removal and disposal of
wastes
Who for Municipal BMPs?
Before Visiting Site
Starts with Record Drawings
Forebay
Catches sediment,
sand, trash & debris
before it enters the
practice.
Concrete forebay
Mulched / vegetative forebay
(not by design)
Level spreader forebay
(typically poured concrete or metal
and are level)
Flow Path
from previous slide
Litter EVERYWHERE!
Outlet
Orifice
Emergency Overflow
Rock
Inlet
Sediment build-up
Inlet (R)
Biocell: Vegetation
management needed, closer
look…eroded along concrete
inlet
Vegetation
Keep or Pull
New Resource App
Iowa Plants: Pull It or Keep It
Large Areas in Prairie
Prescribed burns
Trained staff or contractors
Underground Chamber Systems
Wet Ponds (A)
Algae
Upstream Conditions
Combo –
rock & turf
retention basin
Eroding inlet –
compromising
parking lot
Sedimentation in Wet Ponds
Measuring Sedimentation
Habitat loss
Recreational loss
Dredging
Permeable Pavements
Test Infiltration
As easy as pouring
water!
5 – 10 locations
recommended
Focus on areas of
susceptibility first
Vac/Sweep on a regular basis
If really clogged, may take a couple of passes
Want to Learn More
Design, Inspection & Maintenance
Checklists Available to ISWEP Members
IowaStormwater.org
RainscapingIowa.org