DamOutletWorks.org Site Map

Main Pages

• Existing Conditions
• Rehab vs. Replacement
• Outlet Configuration
• Filters and Drains
• Accounting for Energy Dissipation
• Construction Considerations

All Pages

Page Type	Page
Main	Existing Conditions
Topic	Pipe Deterioration
Subtopic	Deterioration Accelerates with Time
Subtopic	Extent of Corrosion May Limit Repair Options
Subtopic	Deterioration at Invert is Hard to Detect
Subtopic	Corrosion Occurs from Outside In
Subtopic	Inspect Full Length of Pipe
Subtopic	Connection between Riser and Conduit often First to Fail
Subtopic	Bituminous Coating Impact on Design Life of Pipe
Subtopic	Treatment Types
Subtopic	Exposed Steel
Subtopic	Longitudinal Cracking
Subtopic	Joint Deterioration - Pay me now or pay me later
Subtopic	Service Life
Subtopic	Continuous Flows can Reduce Deterioration in Downstream Valves
Topic	Seepage and Piping
Subtopic	Seepage and erosion around the conduit must be taken seriously
Subtopic	Seepage into pipe can go unnoticed for years until sinkhole develops
Subtopic	Deteriorated conduits with holes can cause seepage
Subtopic	Multiple Factors May Contribute to Internal Erosion Failures
Topic	Operation
Subtopic	Debris Clogging Intake Structure can lead to Overtopping
Subtopic	Use a Limit Nut on Gates
Topic	Erosion/Energy Dissipation
Subtopic	Headcuts in stream can lead to failure
Subtopic	Erosion that cuts into the toe of dam can cause embankment instability
Topic	Investigation Methods
Subtopic	Go-Pro Mounted on a Sled
Subtopic	Closed Conduit Television Camera
Main	Rehab vs. Replacement
Subtopic	⚠ Gather Information Before Design
Subtopic	Pipe too deteriorated? Sliplining is not an option.
Topic	Conduit / Pipe Rehabilitation
Subtopic	Slipline Example 1
Subtopic	Slipline Example 2
Subtopic	⚠ May force water along outside of pipe
Subtopic	⚠ May require more grout than anticipated
Subtopic	CIPP Works well for Smaller Conduits
Subtopic	⚠ Cautions for CIPP in Large Diameter Conduit
Subtopic	CIPP Example 1
Subtopic	CIPP Example 2
Subtopic	Internal Repair of Isolated Damage (Joint)
Subtopic	Filter Diaphragm Exhibits
Subtopic	Filter Diaphragm may Require Downstream Pipe Replacement or Extension
Topic	Replacement
Subtopic	Coated CMP Example, Low-Hazard Dam
Subtopic	HDPE Encased in Concrete
Subtopic	PVC in Small, Low-Hazard Dam
Subtopic	Concrete Bedding is Easier to Bed than Clay
Subtopic	Importance of a Dry Trench During Construction with Concrete Cradle
Topic	Abandonment
Subtopic	Abandonment Example 1
Main	Outlet Configuration
Topic	Upstream Control
Subtopic	Sloping Gate Example 1
Subtopic	Sloping Gate Example 2
Subtopic	Upstream Gate Stem can be Protected by Concrete or Riprap
Subtopic	Upstream Control with Single Gate
Subtopic	Upstream Control with Multiple Gates
Subtopic	Ice and Debris may cause Damage
Subtopic	Wet Tower with Spillway Splitter Wall No. 1
Subtopic	Wet Tower with Spillway Splitter Wall No. 2
Subtopic	Dual Chamber with Dual Slide Gates
Subtopic	Single Chamber and Gate
Topic	Downstream Control
Subtopic	⚠ Include an Upstream Gate/Valve
Main	Siphons
Subtopic	Siphons when regular releases aren't needed
Subtopic	Siphoning May Not Always Be Possible
Subtopic	Low Pressure During Siphoning Can Collapse Pipe
Subtopic	Pump... or Siphon?
Subtopic	Siphons can pose Reservoir Level Control Challenges.
Main	Filters and Drains
Topic	General Information
Subtopic	Filter Diaphragm Exhibits
Subtopic	Filter Diaphragm may Require Downstream Pipe Replacement or Extension
Topic	Drainage Pipes
Subtopic	Access is Needed for Inspection, Cleanout, and Measurement
Subtopic	Typical Toe Drain Pipe Construction
Topic	Soils
Subtopic	Typical Filter and Drain Configurations
Main	Accounting for Energy Dissipation
Subtopic	Hydraulic Jump Stilling Basin Examples
Subtopic	Impact Basin Examples
Subtopic	Stilling Well Examples
Subtopic	Conduit Outlet Expansion Examples
Subtopic	Riprap and Concrete Blocks Examples
Subtopic	Baffled Drop Examples
Main	Construction Considerations
Subtopic	Filter Diaphragms
Topic	Pipe Installation
Subtopic	Concrete Bedding Easier than Clay
Subtopic	Importance of a Dry Trench During Construction with Concrete Cradle
Subtopic	Pipe Grade
Topic	Dealing with Mud/Muck
Subtopic	Anticipate dewatering problems in advance
Subtopic	Underwater Construction