1. Stormwater Management 101: Implementation Options through Partnerships
CWEA Stormwater Spring Seminar: LID Design Workshop- Lesson Learned
Stormwater Management 101: Implementation Options through Partnerships

2. Design Prospective: Getting Your Plans Approved
Rosanna La Plante, P.E.
Office of Compliance and Laboratories
Department of Public Works
City of Baltimore
April 2015

3. Department of Public Works
Who we are.
Unlike other counties, we have authority for both SWM AND ESC.

4. Plans Review and Inspection Section
Stormwater Management (Article 7, Div. II)
Erosion &Sediment Control (Article 7, Div. III)
Wet Utilities (Article 25 and Standard Details)
Inspections
Pre-construction notification
Bi-weekly Inspections
Milestone SWM inspections
Final Inspection/ Removal of ESC
Post-construction Inspection
SWM: Every 3 years or by complaint
ESC: By complaint
Plans Review by DPW
Building Permit DHCD
ROW Permit DGS
What we do

5. SWM /ESC Review Process
Concept Submittal
Concept Approval
SDP Submittal
SDP Approval
Final Submittal
Review Comments
Waiver Public Notice
Review Comments
NPDES General Construction Permit
Review Comments
Process: noting three review stages
City Permits
MDE Permits
Final Approval
Construction

6. Stormwater Management Options
1. ESD Practices (Ch. 5)
By CLA, RLS, or PE
Small footprint
Drainage area constraints
Simple calculations
Most require infiltration
Demonstrate ESD to MEP
Quality Control
2. Traditional Practices (Ch 3)
Most require P.E.
Large footprint & d.a.
Long complicated calculations
Quantity/Quality Control
3. Alternative Practices
Limited Guidance
Quality Control
Demonstrate that stormwater management has been considered in this order.
Emphasize ESD to MEP.
Innovative technology is part of alternative practices. Other alt include affforestation, stream restoration, and mechanical sweeping.
Off-site treatment usually constrained to same watershed.
Fee in lieu is a last resort.
On-site Treat
Off-Site Treat
SWM Bank
Fee-in-lieu

7. Site Constraints of an Urban Area
This helps ESD to MEP argument. Easy to argue that ESD can’t be done… but
High density/small sites l Established utilities l Dispersed open space
Polluted soils l Buried streams l Compacted soils l Neighborhood identity

8. Treatment Train Waverly School #51
9 Micro-bioretention areas and a green roof
Example of treatment train and ESD practices in an urban area. It can be done.

9. Available Guidance Expectation of Content Documents the conversation
Checklists
Expectation of Content
Documents the conversation
Basis of QA/QC
Decreased design & review effort
Std Details
Tech Specs
Notes
The state guidance manual is a good starting point but there are supplemental guidance docs for ESD
Note that anything in italics is a requirement.
Most jurisdictions have their own checklist to reflect their unique issues – find them early or expect delays.
Although we have over 17 checklists, they have helped a lot in decreasing review times.
Updated Standard details for ESC has also improved the review time and the City is working on std SWM details and technical specifications to decrease both design and review times. This also allows for quality control of materials.
For our City projects, we have modified our checklists to include a review by the project manager– a pre-screening before it gets to our office. This allows the PM to understand the quality of the submittal.
Do not assume that the standard notes are skipped over– we read them carefully.

10. Get the Right People Involved Early
Regulatory Agency
Each jurisdiction is a little different
Pre-submission meetings are encouraged
Design Team
Resist the “silo” treatment of SWM/ESC
Owner’s Maintenance Staff
Just because it can be built, does not mean the owner can maintain it.
Community
Franklin Square Elementary /Middle School (Photos provided by Parks and People Foundation)
This should be step #1. Stormwater used to be considered an afterthought resulting in it being the bottle neck for permitting.
Silo treatment– swm/esc part of civil team and usually produce separate drawings, which don’t match the full package. This is very important for green roofs and rainwater harvesting.
Maintenance – cite school example and permeable pavement.
Community – SWM is visible. If accessible to the public, then get their buy-in early or they will use the SWM/ESC review to stop the project.

11. Schedule and Cost Considerations
Review time and the queue
Response to comments  There are always comments!
Public Notice – NPDES General Permit
Costs
Borings and infiltration tests
Underground utility location
Permitting fees
SWM surety bond requirements
As-built and survey requirements = $
Time is money.
This goes back to the getting right

12. Rain Gardens and Micro-Bioretention
Insufficient ponding area
Drainage delineation
Getting flow to facility
Underdrain positive drainage
Fabric layer
Location – think about salt and snow
Utility location
Standard details – not typical

13. Exercise 1 Practice Area (sf) D.A. (ac) I.A. (ac) Vol. (cf) ESDv (cf)Pe 1
5,320
0.45
0.17
7,441
1,681
2.0 3a
4,585
0.25
0.00
5,961
120
2.6 3b
2,232
0.29
2,902
135 3c
3,498
0.42
0.01
4,547
280

14. Exercise 2

15. Micro-Bioretention – Design
Blue Alleys Project (Photos provided by Blue Water Baltimore and Biohabitats)

16. Micro-Bioretention –Install

17. Permeable Pavement DA=surface of pervious (no run on)
No water ponding in the pervious pavers
Soil types
Be aware of surroundings
Detailed sequence of construction
Maintenance requirements
Blue Alleys Project (Photos provided by Blue Water Baltimore and Biohabitats)

18. Green Roof DA = Surface of roof (run on ok)
Access to site for maintenance
Continuous coordination with Architect

19. Summary Follow local regulations and use guidance documents.
Keep open communication early and often… but don’t pester.
Consider schedule and costs in project planning.
Identify site constraints early to support ESD to MEP.
Provide clean and clear plans and supporting docs.

20. Office of Compliance and Laboratories Department of Public Works
Thank you for your time.
Ms. Rosanna La Plante, P.E.
Office of Compliance and Laboratories
Department of Public Works