A useful technology to solve or mitigate artificial

Via Paesa, 46048 Roverbella (MN) Italy

www.dragflow.it info@dragflow.it

DRAGFLOW CORPORATE

OVERVIEW

A useful technology to solve or mitigate artificial reservoir sedimentation

Alfredo Ranaldi

WHY MUST RESERVOIRS BE DREDGED?

• Restriction of sediment flow = erosion downstream Water lacking sediments is much more aggressive. A phenomenon called Hungry Water

• The lack of coarse sediment (sand, gravel) has resulted in channel incision and consequent effects on bridges and other infrastructure

• The lack of fine sediment (silt, clay, nutrients) can

have serious effects on balance of downstream ecosystems,

• Abrasion of hydromechanical parts leads to a shorter dam life time.

RESERVOIR CAPACITY: 6,000X 109 M3 (WORLDWIDE)

In few years the percentage of sediments in the reservoirs will reach 50% of the total storage volume

MAIN CAUSES

1. Climate change

2. Flash floods

3. Soil erosion

4. Vegetation degradation

5. Agricultural development

6. Wood coverage reduction

COUNTERMEASURES

• CATCHMENT BASIN INTERVENTIONS (SURFACE PROTECTION, WEIRS ALONG TRIBUTARIES, VEGETATION IMPROVEMENT, REFORESTATION, ETC.)

• RESERVOIR DESILTING (DESILTING CHANNELS, DREDGING IN SELECTED AREAS, ETC.)

Ambiesta Dam, Italy – Subject of current case history

AMBIESTA DAM CASE HISTORY

MAIN CHARACTERISTICS:

• Normal operating water level: 484 m.a.s.l. (1574ft)

• Maximum water level: 485.50 m.a.s.l. (1592ft)

• Dam volume: 28,734 m3 of concrete

• Crest length: 144.64 m (472ft)

• Dam thickness (at the top): 1.80 m (59ft)

• Dam thickness (at the toe): 5.52 m (18.11ft)

AREA TO BE DREDGED

• Total surface: 4,500 m2

• Water depth: 20 – 36 m (65 – 118ft)

• Volume to be dredged: 28,000 m3

• Sediment thickness: 6 – 10 m (19 – 33ft)

DESIGN CRITERIA & ENVIRONMENTAL CONSTRAINTS

• SEDIMENT QUANTITY

• TOTAL SURFACE TO BE DREDGED

• WATER DEPTH

• DREDGING TIME (100 DAYS)

• DISPOSAL AREA

• SEDIMENT CONCENTRATION (9G/L)

• TURBIDITY LIMITATIONS

DESIGN OF COST EFFECTIVE SOLUTION

1. Pump selection

2. Accessories (side cutters, noise

reduction tool)

3. Discharge pipe (booster station)

4. Dredger (power pack)

5. Service boat

SOLUTION SELECTED FOR AMBIESTA RESERVOIR

• DREDGER EQUIPPED WITH WINCHES

• HYDRAULIC POWER PACK

• GPS SYSTEM FOR CORRECT POSITIONING

• N. 1 HYDRAULIC PUMP HY85/160B

• N. 2 SIDE CUTTERHEADS

• SERVICE BOAT

• DISCHARGING PIPELINE WITH FLOATERS

Low pressure area

High pressure area

Cutting action

Agitator

DREDGING PUMP: HY85/160B

DREDGING PUMP: HY 85/160B

OUTPUT = 500m3/h (2200GPM)

SIDE CUTTER HEADS EXHY20

CUTTER POWER 20HP EACH

DREDGING UNIT

DREDGING EXECUTION

GPS SYSTEM TO DETERMINE PUMP POSITION

PARAMETERS MONITORED DURING THE PROJECT

1. GPS for real time position of

the pump (x,y,z coordinates);

2. Sediment concentration device

installed on three positions: at

the dredge, at the mixing point

and at the river junction.

Maximum concentration at river

junction: 9g/l

PRE AND POST DREDGING SURVEY

After dredging Before dredging

COUNTERMEASURES

Dredged sediment according to Client’s requirements

• Dredging solution demonstrated its validity

• Dredging activity has been developed in the requested time

• Productivity 200 – 800 m3/day • No stand by time has occurred • Material has been dredged

exactly where was needed • Environmental constraints have

been fully respected

THANK YOU FOR YOUR ATTENTION

A useful technology to solve or mitigate artificial

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