URBAN STREAM REHABILITATION

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