F. Cherqui1, 2, D. Granger3, M. Métadier4, TD. Fletcher5, S. Barraud2,6, P. Lalanne3, X. Litrico3

1 Université Lyon 1, LGCIE, 69622, Villeurbanne, France 2 Université de Lyon, 69361, Lyon, France 3 LyRE, Centre de recherche de Lyonnaise des Eaux Bordeaux, 33400 Talence 4 Safege, 15-27 rue du Port, Nanterre cedex, F-92022, France 5 Department of Resource Management and Geography, The University of Melbourne, 221 Bouverie St., Parkville, Victoria 3010, Australia 6 INSA-Lyon, LGCIE, 69621, Villeurbanne, France

Household

Questionnaire Single site inspection / monitoring /

document consultation

Short term measurement

campaign (<1 year) Long term monitoring

Series of questions to gather from the

owner and manager Field investigation to gather information :

measures, interview to stakeholders , etc.

Regular measurements and

observations for several years –

long-term trends

Semi-continuous or continuous

monitoring for a specific objective

Streetscape Precinct / Suburb

Hydraulic performance

Peak flow attenuation at the outlet, lag-time,

overflow frequency and drainage duration

indicators

Hydrological performance

Reduction in mean annual runoff volume

Runoff frequency, flow-regime comparison with

pre-developed situation (baseflow, stormwater

and infiltration volumes), …

Treatment performance

Pollutant concentration attenuation (EMC), event based

pollutant removal (mass), pollution retention

performance, depth of polluted soil, potential

contamination indicators

Economic aspects

Design costs, construction costs,

operational costs and savings/return on

investments

Other environmental and sanitary

aspects

Creation of habitats and enhancement of

biodiversity (Shannon diversity index), stormwater

harvesting, mitigation of heat island, …

Performance

evaluation

At the scale of application

Single technique or

treatment train

Social acceptance

Public perception, odours (number of complaints),

social benefits, water storage (irrigation, fire fighting,

etc), safety (number of accidents, potential for

increase in crime due to site design), …

Lifespan and long-term effectiveness

Long term functionality

Monitoring and maintenance check list

Consultation of local stakeholders (e.g. ecologists, specialists)

Indicators of BMP performance : a framework for operational monitoring

Suivi opérationnel des performances des techniques

alternatives, quelles mesures ?

Hydrological processes & outcomes (*) Treatment process Scales of application

Det

entio

n (&

/or

Ret

entio

n

Infil

trat

ion

Flo

w

atte

nuat

ion*

Vol

ume

redu

ctio

n*

Bas

eflo

w

rest

orat

ion*

Sed

imen

tatio

n

Filt

ratio

n

Ads

orpt

ion

Bio

logi

cal

trea

tmen

t

Hou

seho

ld

Str

eets

cape

Pre

cinc

t/Sub

urb

Soakaway ++ +++ + ++ + +++ ++ ++ X X

Green roof / detention roof ++ ++ + ++ ++ +4 X

Swale ++ (++) + (+) (+) ++ (+++) ++ ++ X

Filter strips . +++ + (+) (+) + +++ +++ ++ X

Detention / infiltration trench ++ (++) ++ (+++) (++) + (+++)5 (++)5 (++)5 X X

Rain garden / Biofiltration

systems +++ +++ +(+) (++) (++) ++ +++ +++ +++ X X X

Porous Roads ++ (+++) ++ (++) (++) + (+++)6 (+++)6 (++)6 X X X

Wet pond +++ +++ ++ + + X

Wetland +++ ++ ++ ++ + +++ X

Dry pond +++ (+++) +++ (++) (+) ++ (+++) +++ + (+++) X

Rainwater tank +++ ++ +++ +3 ++ X X

Other equipment that may be used in addition

Gross Pollutant Trap +1 +++2 X

Sand filter ++ +++ ++ ++ X X X

Treatment processes and scales of operation in stormwater BMP technologies.

Output: Adaptive survey according to relevant performance criteria

Design and circumstance data Required Required Not appropriate Not appropriate

Hydraulic performance (flood mitigation) Only if information is known Using modelling tool Not appropriate At least 1 year for current events

Hydrological performance Only if information is known Using modelling tool Not appropriate At least 1 year for site scale

At least around 5 years for catchment scale

Treatment performance Only if information is known Using modelling tool Several events at least At least 1 year

Economic aspects Required Not appropriate Not appropriate Not appropriate

Other environmental or sanitary aspects Only if information is known Not appropriate or Required

(depending on the indicator)

Required

Duration of observation depends on indicators chosen

Required

Duration of observation depends on indicators

chosen

Social acceptance Only if information is known Required for [yes / no] indicators Required for survey at different time / season of the year Required to monitor the evolution

Lifespan and long-term effectiveness Only if information is known Required (depending on the indicator) Required (depending on the indicator) Required (depending on the indicator)

+ low ability; ++ medium ability; +++ high ability; () only if infiltration is possible

* These are not strictly hydrological processes, but rather outcomes in terms of changes to the flow regime. 1 Generally removal of only very coarse sediment, depending on the design 2 Achieved typically through screening through a screen with a defined aperture. 3 Only if connected to irrigation or provided with a ‘trickle outlet’ specifically designed to enhance baseflows. 4 if green roof 5 if covered by topsoil

6 if infiltration porous structure or permeable surface