prioritization next steps 10182011 revprioritization s 1 post‐screening project types low...
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Sonoma Valley Stormwater Management and Groundwater Recharge Scoping Study
Prioritization & Next Steps
Betty AndrewsPrincipalp
www.sonomacountywater.org
Screen and prioritizeScreen and prioritize
Project typesinventory Stakeholder ideas
screen Likelihood of achievement of both
Likelihood of physical feasibility:
Fair or better
inventory
screen achievement of both core objectivesrecharge
geology
Slope < 10%
Siting feasibilityAbsence of
significant water quality concernsprioritize
Low likelihood of significant regulatory
constraintsMagnitude of
Expected cost/units of core objective
benefit
Ability to meet supporting objectives
Magnitude of potential core
benefits
Short list of potential project concepts (type, location)
Prioritization
S 1 S 2 S 3
Absence of i ifi
Low likelihood of i ifi l
Magnitude of
Step 1 Step 2 Step 3
Ability to meet
significant water quality concernsprioritize
significant regulatory constraints
potential core benefits
Expected
Siting feasibility supporting objectives
cost/units of core objective benefit
Short list of potential project concepts (type, location)
PrioritizationPrioritization
S 1Post‐screening project types
/ /
Low likelihood of i ifi l
Step 1 In‐line detention/retention/recharge basinsOff‐line detention/retention/recharge
prioritizesignificant regulatory
constraintsbasinHigh flow diversion/recharge
Floodplain attenuation/recharge
Expected cost/units
Siting feasibilityFloodplain attenuation/recharge
Above‐ground or underground storage tank/rechargeI fil i ll /d iof core objective
benefitInfiltration gallery/detention
Self‐cleaning infiltration trench/detention
LID
PrioritizationPrioritization
S 1Post‐screening project types
/ /
Low likelihood of i ifi l
Step 1 In‐line detention/retention/recharge basinsOff‐line detention/retention/recharge
prioritizesignificant regulatory
constraintsbasinHigh flow diversion/recharge
Floodplain attenuation/recharge
Expected cost/units
Siting feasibilityFloodplain attenuation/recharge
Above‐ground or underground storage tank/rechargeI fil i ll /d iof core objective
benefitInfiltration gallery/detention
Self‐cleaning infiltration trench/detention
LID
PrioritizationPrioritization
S 1Post‐screening project types
/ /
Low likelihood of i ifi l
Step 1 In‐line detention/retention/recharge basinsOff‐line detention/retention/recharge
prioritizesignificant regulatory
constraintsbasinHigh flow diversion/recharge
Floodplain attenuation/recharge
Expected cost/units
Siting feasibilityFloodplain attenuation/recharge
Above‐ground or underground storage tank/rechargeI fil i ll /d iof core objective
benefitInfiltration gallery/detention
Self‐cleaning infiltration trench/detention
LID
Prioritization
Project types LocationsOff‐line basin Sonoma Creek at Lawndale
Step 1 Sonoma Creek above Calabasas Creek Calabasas Creek at Sonoma Creek Sonoma Creek at Agua Caliente Road Sonoma Creek below Dowdall Creek Nathanson Creek at Schell Creek Fowler Creek above Rodgers Creek Arroyo Seco at Schell Creek Rodgers Creek at Fowler Creek
High flow di i / h
Sonoma Creek at Lawndalediversion/recharge Nathanson Creek at Schell Creek
Infiltration gallery (Subbasins as listed for off‐line basins)Self‐cleaning infiltrationSelf cleaning infiltration
trench(Subbasins as listed for off‐line basins)
LID (Subbasins as listed for off‐line basins)Table 3:
PrioritizationPrioritizationPost‐screening project types
/ /In‐line detention/retention/recharge basinsOff‐line detention/retention/recharge
prioritize
Step 2
basinHigh flow diversion/recharge
Floodplain attenuation/recharge
Magnitude of potential core
Step 2 Floodplain attenuation/recharge
Above‐ground or underground storage tank/rechargeI fil i ll /d ipotential core
benefitsInfiltration gallery/detention
Self‐cleaning infiltration trench/detention
LID
PrioritizationPrioritization
Best location for flood prioritize
Step 2
hazard reduction
Step 2
Magnitude of potential core
Best location for groundwater recharge
potential core benefits
PrioritizationPrioritization
prioritize
Step 2Step 2
Best location for flood h d dhazard reduction
PrioritizationPrioritization
prioritize
Step 2Step 2
Best location for d hgroundwater recharge
Prioritization
Project types LocationsOff‐line basin In lower‐slope recharge‐suitable
Step 2Off line basin In lower slope, recharge suitable
portions of the following subbasins:
Sonoma Creek at LawndaleSonoma Creek at Lawndale Sonoma Creek below Dowdall
Creek Nathanson Creek at Schell
CreekHigh‐flow diversion/
rechargeApproximately along existing
high‐flow pathways: Sonoma Creek at Lawndale Nathanson Creek at Schell
CreekInfiltration gallery (Subbasins as listed for off‐line
basins)Table 4:
Prioritization
S 3Absence of
significant water
Step 3No broad water quality concerns in prioritizedsignificant water
quality concernsprioritizeconcerns in prioritized
subbasinsAbility to meet supporting objectives
Prioritization
S 3Good potential to address supportingStep 3 address supporting
objectivesOfba
Hig
dive
Infilgal
Ability to meet
Supporting Objectives
ff‐line asins
h‐flow
ersions
tration lleries
Water Quality X X Xsupporting objectives
Water Quality X X XWater Supply X XSystem Sustainability X X XEcosystem X XEcosystem X XAgricultural Land X X XOpen Space X XCommunity BenefitsCommunity Benefits X XTable 5:
Prioritization
Step 3Project types LocationsOff‐line basin In lower‐slope, recharge‐suitableOff line basin In lower slope, recharge suitable
portions of the following subbasins: Sonoma Creek at Lawndale Sonoma Creek below Dowdall
Creek Nathanson Creek at Schell Creek
High‐flow diversion/ Approximately along existing high‐recharge flow pathways:
Sonoma Creek at Lawndale Nathanson Creek at Schell Creek
Table 6: Infiltration gallery (Subbasins as listed for off‐line basins)
Prioritization
S 1 S 2 S 3
Absence of i ifi
Low likelihood of i ifi l
Magnitude of
Step 1 Step 2 Step 3
Ability to meet
significant water quality concernsprioritize
significant regulatory constraints
potential core benefits
Expected
Siting feasibility supporting objectives
cost/units of core objective benefit
Short list of potential project concepts (type, location)
Prioritization
prioritize
Short list of potential project concepts (type, location)
Project types LocationsOff‐line basin Sonoma Creek at Lawndale
Sonoma Creek below Dowdall100 – 500 acre‐feet of t Creek
Nathanson Creek at Schell CreekHigh‐flow diversion/ Sonoma Creek at Lawndale
storage
Low‐gradient, high recharge Nathanson Creek at Schell Creek
Infiltration gallery (Subbasins as listed for off‐line basins)
recharge potential lands
Next StepsNext Steps
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