Importance of Stormwater BMP Inspection & Maintenanceiowa.apwa.net/Content/Chapters/iowa.apwa.net/file/2018... · 2018. 4. 11. · Importance of Stormwater BMP Inspection & Maintenance

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