sempresent'n

8/7/2019 sempresent'n

1/14

A

Seminar on

Stormwater Management

Presented by Guided by


2/14

Introduction

Stormwater runoff is the water associatedwith a rain or snow storm that can be measured in a

downstream river, stream, ditch,gutter, or pipe

shortly after the precipitation has reached the

ground. To achieve best practice in theenvironmental management of stormwater, it is

important that catchment management activities are

guided by strategies or plans.This provides

guidelines for the development of stormwatermanagement plans. While it is intended mainly for

application at local government levels.


3/14

Stormwater Control Measures

SCMs reduce or mitigate the generation

of stormwater runoff and associated pollutants.

The responsibility for implementing SCMs

primarily resides with developers and localstormwater agencies, but planning agencies,

landowners, existing industry, regulatory

agencies, and municipal separate storm sewer

system (MS4) permittees can also be responsible

for implementing SCMs.


4/14

1. Product Substitution

2. Watershed and Land-Use Planning3. Conservation of Natural Areas

4. Impervious CoverMinimization

5. Earthwork Minimization6. Erosion and Sediment Control

7. Reforestation and Soil Conservation

8. Pollution Prevention SCMs forStormwater

Hotspots

9. Runoff Volume Reduction Rainwater

harvesting


5/14

10. Runoff Volume Reduction Vegetated

11. Runoff Volume Reduction Subsurface12. Peak Reduction and Runoff Treatment

13. Runoff Treatment

14. Aquatic Buffers and Managed Floodplains

15. Stream Rehabilitation

16. Municipal Housekeeping

17. Illicit Discharge Detection and Elimination

Stormwater

18. Residential Stewardship


6/14

This location exhibitsseveral elements ofimpervious coverreduction. In particular,vegetated swales wereinstalled and curbs andgutters removed. There

are sidewalks on only oneside of the street, andthey are separated fromthe road by the swales.The residences rooftopshave been disconnected

from the storm-drainsystems and areredirected into the swales.

Fig. 110th Street, Seattle, part of the

Natural Drainage Systems Project.


7/14

City Hall in the center of

Chicagos downtown was

retrofitted with a greenroof to reduce the heat

island effect, remove

airborne pollutants, and

attenuate stormwaterflows as a demonstration

of innovative stormwater

management in an ultra-

urban setting.

Fig. City Hall in the center of Chicagos

downtown was retrofitted with a green

roof


8/14


9/14

Rainwater harvesting systemsrefer to use of captured runoff

from roof tops in rain barrels,tanks, or cisterns. This SCMtreats runoff as a resource andis one of the few SCMs thatcan provide a tangible

economic benefit through thereduction of treated waterusage. Rainwater harvestingsystems have substantialpotential as retrofits via the use

of rain barrels or cisterns thatcan replace lawn or gardensprinkling systems.

Fig. Rainwater Harvesting


10/14

Watershed Permitting Framework for

Managinging Stormwater

The important benefits of watershed permitting: More environmentally effective results

Ability to emphasize measuring the effectiveness oftargeted actions on improvements in water quality

Greater opportunities for trading and other market-basedapproaches

Reduced cost of improving the quality of the nationswaters

More effective implementation of watershed plans,

including total maximum daily loads (TMDLs) and Other ancillary benefits beyond those that have been

achieved under the Clean Water Act (e.g., integrating CWAand Safe Drinking Water Act [SDWA] programs).


11/14

Impact ReductionThis approach to impact reduction, where the direct focus ison reducing the loss of aquatic ecosystem.

Practices for Impact Reduction;The SCM qualify as ARCD (Aquatic ResourcesConservation Design) include,

Product Substitution

Watershed and Land-Use Planning Conservation of Natural Areas

Impervious CoverMinimization

Earthwork Minimization

Reforestation and Soil Conservation

Runoff Volume ReductionRainwater Harvesting,Vegetated, and Subsurface

Aquatic Buffers and Managed Floodplains and

Illicit Discharge Detection and Elimination


12/14

Municipal Permit tee Roles in

Implementing Strategies

Activity location prioritizationlocations prioritized foraction based on pollutant loading potential

Implementation strategy and activity prioritizationtiered approach identifying activities directed at

meeting watershed goals over a five-year period Potential watershed activitiesgeneral list of activities

required and potentially required to meet goals asguidance for planning and budgeting

Watershed activity mapsspecified locations foractivities and

Framework for assessment monitoringa plan fordevelopment of the monitoring and reporting program.


13/14

CONCLUSION

EPA should support the compilation of quality

industrial storm water effluent data and SCM effluent

quality data in a national database

EPA should develop numerical expressions to

represent the MS4 standard ofMaximum ExtentPracticable

Communities should use an urban stream

classification system, such as a regionally adapted

version of the Impervious CoverModel, to establishrealistic water quality

Better monitoring ofMS4s to determine outcome is

needed


14/14

sempresent'n

Documents