Environmental Engineering Reference
In-Depth Information
period.of.15.years.with.sanitary.sewers.and.retroit.source-based.stormwa-
ter.management.systems.such.as.constructed.wetlands,.where.feasible..The.
total.amount.of.stormwater.carried.by.the.system.is.aimed.to.be.reduced.by.
15%.. A. GIS-based. planning. tool. has. been. used. to. highlight. and. prioritize.
the.feasible.level.of.disconnection.in.each.subarea..In.the.United.Kingdom,.
constructed.wetlands.for.the.treatment.of.stormwater.comprise.around.5%.
of.the.probable.total.number.but.they.are.increasing.in.response.to.the.WFD.
and.the.promotion.of.Sustainable.Urban.Drainage.Systems.(SUDS).(Shutes.
et. al.,. 2005).. A. survey. of. 182. drainage. sites. in. Glasgow. and. Edinburgh,.
Scotland,. indicated. appropriate. individual. BMP. techniques. or. short. BMP.
treatment. trains. for. retroitting. existing. drainage. systems. and. for. future.
developments.(Scholz,.2007)..Glasgow.has.higher.volumes.of.rainfall.run-off.
and.considerably.more.regeneration.sites.with.potential.for.developing.con-
structed.wetlands.than.Edinburgh,.which.has.a.lack.of.affordable.space.and.
will.therefore.rely.on.retroitting.other.BMP.types..A.BMP.Decision.Support.
Matrix.was.prepared.comprising.dominant.criteria.including.the.area.avail-
able.for.the.BMP.and.the.quality.of.the.run-off.and.it.speciies.the.technical.
conditions. for. the. implementation. of. the. corresponding. BMP.. The. supple-
mentary.criteria.included.catchment.size.and.land.value.and.were.weighted.
according.to.their.relative.importance.for.each.BMP.technique.
A. system. for. the. selection. of. BMP. types. has. been. developed. in. the.
European.Union.(EU).Day.Water.project..The.Adaptive.Decision.Support.
System. (ADSS). for. Stormwater.Pollution.Control.involves.a. multi-criteria.
decision-making. system,. the. multi-criteria. comparator. (MCC),. which.
includes. technical,.socio-economic,. and. environmental. criteria. for. evalu-
ating. and. identifying. the. most. preferred. BMP. option,. and. a. shortlist. or.
ranking. of. options. (Figure. 19.1;. Ellis. et. al.,. 2008).. The. Day. Water. ADSS.
website. address. is. www.daywater.in2p3.fr/EN. (user. name. “guest”. and.
password.“guest”).
The.different.drainage.options.can.be.scored.by.stakeholders.against.each.
of.the.identiied.indicators.on.a.scale.of.0-5..For.example,.if.it.is.considered.
that.a.particular.option.(e.g.,.constructed.wetland).does.not.contribute.any-
thing.toward.the.“pollution.control”.indicator;.it.is.awarded.a.score.of.“0.”.
However,. if. constructed. wetlands. are. considered. to. offer. the. best. oppor-
tunity. for. pollution. control,. a. score. of. “5”. is. awarded.. When. developing.
scores,.it.is.often.easiest.to.decide.on.the.“best”.and.“worst”.options.with.
respect.to.a.particular.indicator,.and.then.agree.on.how.well.the.“interme-
diate”.options.contribute.to.meeting.the.indicators.relative.to.these.identi-
ied.“best”.and.“worst”.options..The.desired.percentage.weightings.for.the.
indicators.need.to.be.entered.to.relect.the.importance.that.the.stakeholder.
places.on.each.of.the.six.criteria..A.weighting.of.0%.indicates.that.an.indica-
tor.or.criterion.is.not.to.be.considered.within.the.MCC..The.system.handles.
a. large. amount. of. information. in. a. consistent. way. and. facilitates. discus-
sions. between. the. various. stakeholders. involved. with. the. BMP. decision-
making.process.
Search WWH ::
Custom Search