Ranney Collector Construction

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Ranney Collector Construction
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Ranney Collector Overview

• Pump Station
• Central Reinforced Concrete Caisson
• Horizontal Well Screens

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Primary Phases of Collector Well Construction

• Caisson Construction
• Lateral Projection
• Screen Installation and Development
• Performance Testing

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Caisson Construction
L1
L1
L2
Grade
Grade
Grade
L1
L1
STEP 1
STEP 2
STEP 3
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Initial Caisson Lift with Cutting Shoe, Toledo
Bend Reservoir
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Inner and Outer Forms
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Caisson Lift with Ports, Lake Havasu City
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Clam Shell Excavation, Louisville
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Clam Shell Excavation, Lake Havasu City
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Floor Reinforcing, Iowa City
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Completed Caisson
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Primary Phases of Collector Well Construction

• Caisson Construction
• Lateral Projection
• Screen Installation and Development
• Performance Testing

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Lateral Projection
Grade
SWL
Caisson
Lateral A
Lateral B
Ports
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Hydraulic Jacking Machine
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Lateral Projection, Iowa City
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TYPICAL BORE PILOT

• Minimize Friction
• Remove Material
• Provide Horizontal Bore

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Projection Pipe and Sand Line
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Laterals Installation Bore Pilot Projection
Pipe Centered On Port Assembly
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Lateral Installation Projection Pipe Advancement
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Lateral Installation Projection Pipe Advancement
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Primary Phases of Collector Well Construction

• Caisson Construction
• Lateral Projection
• Screen Installation and Development
• Performance Testing

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Screen Installation
Grade
SWL
Caisson
Lateral A
Lateral B
(Wire-Wrap Screen)
(Wire-Wrap Screen)
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Wire-Wrapped Screen
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Wire-Wrapped Screen
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Development By Overpumping
Q
Grade
SWL
Caisson
Pump
Laterals
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Development By Surging
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Sand Content Measurement
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Primary Phases of Collector Well Construction

• Caisson Construction
• Lateral Projection
• Screen Installation and Development
• Performance Testing

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Performance Testing, Sonoma County
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Top Slab Installation
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Ranney Collector Conceptual Design and Yield
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Equations to Quantify Yield
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Input Parameters / Design Assumptions
T 482,600 gpd/ft S 0.313 K 5602 gpd/ft sq B
86 feet A 700 feet Zi 75 feet
Laterals 10 to 12 Lateral Radius 0.5
ft Lateral Length 200 ft Caisson Radius 8
ft Pumping Level 15 ft above laterals
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Conceptual Design
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Yield With Recharge
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Yield Without Recharge
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Characteristics of Ranney System

• 12.6 to 16.0 million for Total System
• 100 of Construction and Maintenance On Shore
• Yield Remains High When River Migrates
• Pilot Testing to Confirm Yield