URBAN STREAM
REHABILITATION
CASE STUDIES
AESTHETICS
SELECTION OF OBJECTIVES
FOR REHABILITATION SCHEMES
TECHNIQUES OF REHABILITATION
SOCIAL APPRAISAL
TOOLS FOR ASSESSING POTENTIAL
INDICATORS OF SUCCESS
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BENEFITS / IMPACTS
INTRODUCTION, OBJECTIVES & IMPACTS
OPTIONS FOR REHABILITATION
SITE MONITORING
TECHNIQUES FOR
REHABILITATION
2. Techniques for rehabilitation
Measures to lessen the volume of runoff on the source
Natural conditions
Evapotranspiration
Infiltration
10
-
40%
Up to
50%
Can similar effect be achieved
in urban areas ?
2. Techniques for rehabilitation
MEASURES
Measures to lessen the volume of runoff on the source
Vegetated roof covers (VRC)
2. Techniques for rehabilitation
Measures to lessen the volume of runoff on the source
Vegetated roof covers (VRC)
2. Techniques for rehabilitation
MEASURES
Measures to lessen the volume of runoff on the source
Vegetated roof covers (VRC)
Porous pavement: Asphalt
Porous pavement: Modular
-
paving blocks
2. Techniques for rehabilitation
Measures to lessen the volume of runoff on the source
Porous pavement: Modular
-
paving blocks
2. Techniques for rehabilitation
Measures to improve the quality of
runoff
MEASURES
Grassy vegetative filter strips
Grassed swales
2. Techniques for rehabilitation
Measures to improve the quality of
runoff
Grassed swales
Inflow
Inflow
Attenuation and
conveyance
Some interflow and infiltration
2. Techniques for rehabilitation
Measures to improve the quality of
runoff
MEASURES
Grassy vegetative filter strips
Grassed swales
Constructed wetlands
2. Techniques for rehabilitation
Measures to improve the quality of runoff
Constructed wetlands
Inflow
Outflow
Contains a permanent pool of water
Detention up to three weeks
Attenuation, settlement, biological treatment
Design for wildlife habitats
2. Techniques for rehabilitation
Measures to control erosion and sedimentation
MEASURES
Management of construction sites
–
Construction traffic
Temporary runoff diversions and chutes
Silt fence and trapping devices
Sediment basins
Hydro seeding and chemical stabilization
Cover crops and temporary mulches
2. Techniques for rehabilitation
Measures to control erosion and sedimentation
Cabled articulated block
“
Erosion Control in Florida's Little Wekiva River
”
by Mary Brabham and Jeff Cole
2. Techniques for rehabilitation
Measures to detain peak flow
MEASURES
Dry detention basins
Wet detention basins
2. Techniques for rehabilitation
Measures to minimize pollution from sewage
MEASURES
Combined sewer overflow source control
Off
-
line storage of combined sewage
2. Techniques for rehabilitation
Measures for urban stream rehabilitation in channel bed and banks
MEASURES
Sills as transverse structures
Rough bed ground ramps/ rock ground ramps
Block ramp
Racks
Cobble or gravel liners
Channel reconstruction through transverse structures on the streambed
2. Techniques for rehabilitation
Measures for urban stream rehabilitation in channel bed and banks
Sills as transverse structures
Channel reconstruction through transverse structures on the streambed
2. Techniques for rehabilitation
Measures for urban stream rehabilitation in channel bed and banks
Cobble or gravel liners
Channel reconstruction through transverse structures on the streambed
2. Techniques for rehabilitation
Measures for urban stream rehabilitation in channel bed and banks
MEASURES
Branch packing
Vegetated slope grid
Reed
-
roll revetment and biolog
Vegetated rock rip
-
rap
Channel stabilization through stream parallel flow guiding structures
Tiered wall or pilings with bench plantings
Double
-
row wattle palisade
Revetment
-
Piling revetment, slotted board revetment
2. Techniques for rehabilitation
Measures for urban stream rehabilitation in channel bed and banks
Live stakes in existing riprap
Protection and stabilization of stream banks
Salzburger Landesregierung, 2002, p.28
2. Techniques for rehabilitation
Measures for urban stream rehabilitation in channel bed and banks
MEASURES
Groynes, log cribbing deflectors, and current deflectors
Live fascines/ fascine bundles/ sinking fascines
Brush Layering
Live willow racks
Brush mattresses
Protection and stabilization of stream banks
Wattle fence
Live crib walls (syn. Krainer wall)
Log, root wad, and boulder revetment
Vegetated rock gabions
Live slope grating
2. Techniques for rehabilitation
Measures for urban stream rehabilitation in channel bed and banks
Live stakes
Protection and stabilization of stream banks
Before implementation after sprouting after some months
Salzburger Landesregierung, 2002, p.28
2. Techniques for rehabilitation
Measures for urban stream rehabilitation in channel bed and banks
Protection and stabilization of stream banks
Salzburger Landesregierung, 2002, p.13
Example classical and bioengineering river rehabilitation
2. Techniques for rehabilitation
Measures for urban stream rehabilitation in channel bed and banks
Protection and stabilization of stream banks
Schematic river section with possible soil
-
bioengineering measures and
zones of water management and riparian vegetation
Schiechtl & Stern, 2001 p.7
2. Techniques for rehabilitation
Measures for urban stream rehabilitation in channel bed and banks
Protection and stabilization of stream banks
A rehabilitated urban river
(Fervença, Bragança, Portugal)
Before
(view from right bank)
After
(view from centre of river)
More info…
For more information follow this link:
2. Techniques for rehabilitation
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