Lid 2015 active hydromod control - judd goodman 01-20-15

Active Hydromodification Control Judd Goodman, P.E. Marcus Quigley, P.E.

LID and Hydromodification

“The primary goal of Low Impact Development methods is to mimic the predevelopment site hydrology by using site design techniques that store, infiltrate, evaporate, and detain runoff.” -Prince George's County, Maryland (1999)

Hydromodification = Hydrograph Modification

What is Hydromodification?

Flow Duration Control

Active Hydromodification Control

Outline

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Hydromodification = Changes in runoff characteristics and in-stream processes caused by altered land use.


Restoration vs. Hydromodification Management

Fix an existing geomorphic

impact

Prevent a future geomorphic

impact 5


Pre-Development

flow flow

Post-Development

Pre-Urban

Post-Urban

Time

Dis

char

ge

Qc

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Pre-Development Post-Development

flow flow

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Qcritical

Pre-Development Post-Development

Q10


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= X% Q2

Route post-development runoff through BMPs to mimic pre-development hydrology.


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Regional Detention

Onsite Bioretention Underground Detention/Retention

CONTECH

StormTrap


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Hydromodification LID BMPs look the same as for surface water quality, except they are larger!


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Planting Media

Gravel Sump

Surface Ponding

Riser

Slotted Underdrain

Cleanout

Low Flow Orifice

Distributed LID = simple outlet

high flows dictate sizing for this LID BMP with simple

outlet structure

for rest of the flow range, the pre-

development curve is above the post-

development curve


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15


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OptiRTC Function

SWMM

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Opti is a cloud-native platform that uses sensor data, forecast information, and modeling to actively control stormwater infrastructure.

Passive: 1.32 inches Active: 0.60 inches


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Retrofit Existing flood basins and BMPs can

provide hydromodification control New Development BMP size decreases, reduces cost Adaptive Management Data available in real-time Adjust flow releases without physical

retrofit Flow monitoring and calibration

Benefits of Active Control with OptiRTC


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Thank You!

Judd Goodman [email protected]

Oakland, CA

Marcus Quigley [email protected]

Boston, MA

Field Installation Steps

Steps 1 & 2 Create flow duration curves for the Pre- and Post-Development (w/out BMP) runoff conditions based on continuous hydrologic simulation

Step 4 Create Revised Flow Rating Curve: Qout = f (Qin, Qcrit)

Steps 5 – 9 Create Control Curves: % Open = f (Qout, Depth)

Step 10 Create Control Logic Code to lookup Control Curve based on Qin and BMP Depth Example: RULE 1.00 IF NODE Storage DEPTH > 0.75 AND NODE Storage DEPTH <= 1.00 AND NODE Storage INFLOW >= 0 THEN ORIFICE 1 SETTING = CURVE 1.00

Step 11 Create BMP Stage-Storage Curve based on assumed geometric configuration

Step 12 Run continuous hydrologic simulation for post-development conditions (with BMP)

Step 13 Does the Post-Development (with BMP) flow duration curve match the Pre- Development with minimum BMP footprint and volume?

Step 13 (continued) Revise the BMP geometric configuration

Step 14 Install BMP with geometric configuration, outlet configuration, and control logic modeled

Step 15 Monitor Qin, Qout, & BMP Depth

Step 16 Is the monitored Qin consistent with modeled Qin results ?

Step 16 (continued) Recalibrate continuous hydrologic simulation modeling parameters based on monitored data

Step 17 Update flow duration curves for Pre- and Post-Development (w/out BMP) runoff conditions based on continuous hydrologic simulation

Step 17 (continued) Update Revised Flow Rating Curve: Qout = f (Qin, Qcrit)

Step 17 (continued) Update Control Curves: % Open = f (Qout, Depth)

Step 18 Reprogram Control Curves that Control Logic Code looks up

Yes No

Yes

No

Step 3 Create Initial Flow Rating Curve: Qpre vs. Qpost

Step 17 (continued) Update Initial Flow Rating Curve: Qpre vs. Qpost

Active Hydromodification Control Methodology Flowchart

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Lid 2015 active hydromod control - judd goodman 01-20-15

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