Learn to Understand and Manage Drainage
- Prevent soils from becoming too wet for too long
- Prepare for extreme events and reduce risk as much as possible
- Explore techniques to remove both surface and sub surface water
Drainage issues can be small or large.
Course Content
LESSON 1 SCOPE AND NATURE OF WATER MANAGEMENT
- When is Water a Problem?
- What Needs to be Waterproofed in the Backyard?
- Roofs
- Rooftop Gardens
- Retaining Walls
- Ponds, Pools, Spas
- Floors
- Pots
- Spray Units
- Drains, Irrigation Pipes, Hoses, Watering Cans
- Materials for Waterproofing
- Concrete
- Admixtures
- Asphalt, Bitumen
- Silicone Sealant
- Butyl Liners, Fibreglass, Plumbers Tape
- Welding Units
- Bentonite Clay Liners
- Why Drainage is Important
- Reasons for Drainage
LESSON 2 WATER MOVEMENT IN SOILS
- Soil Structure & components
- Gravity
- Surface Tension
- Water Adhesion to Soil Particles
- Forms of water in Sol
- Field Capacity
- Infiltration
- Suction
- Saturation
- Gravitational Water
- Capillary Water
- Hygroscopic Water
- Lateral Movement of Water
LESSON 3 UNDERSTANDING CAPILLARY ACTION
- Adhesion Forces
- Capillary Migration
- Capillary Fringe
LESSON 4 MANAGING WATER AT THE SOURCE
- Rainfall
- Rainwater Harvesting
- Stored Water – Dams, Reservoirs, Tanks
- Diverting Storm Water
- The Water Table
- Perched Water Table
- Leaks
- Fixing a leaky Tap
- Sealing a leaky Pipe
- Fixing a Leaky Pond
- Leaky Copper Pipes
LESSON 5 MANAGING SURFACE DRAINAGE
- Types of Surface Drainage Systems
- Ditches, Open Drains
- Humps and Hollows
- Levees and Graded Banks
- Biofilters
- Permaculture Swales
- Improving Drainage After Construction
- Surface Drainage
- Calculating Peak Storm Discharge
- Average Storm Runoff
- Drainage Channel Systems
- Drainage Structures and Salinity
LESSON 6 MANAGING SUB-SURFACE DRAINAGE
- Improving Soil Drainage
- First decision: subsurface or surface drainage?
- Types of Subsurface Drains
- The Water Outlet
- Gradients
- Layout of Drains
- Laying an Agricultural (Agi) Drain
- Distance Between Drainage Pipes
- Depth of Drains
- Maintenance
- French Drains
- Subsurface Drainage
- Water Table Control
- Water Table Investigations
- Steady State Drainage -Hooghoudt's equation
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LESSON 7 STORM DRAINAGE
- Storm Runoff
- Calculating peak flow rate
- Time of concentration
- Inlet Spacing
- Pipe Sizing - calculating water velocity
- Manholes
- Swales - vegetated swales
- Storm Water Management
- Intensity of Rainfall
- Storm water Runoff Estimations -Calculating runoff
- Selecting the Size (Diameter) of Pipes
- Selecting the Size and Shape of Ditches and Swales
Final Assessment
Who Needs to Learn about Drainage?
- Builders, engineers, developers, land managers
- Concreters, pavers, irrigation workers
- Landscape Contractors
- Drainers, plumbers, earthmoving machine operators
- Anyone working in construction or building.
Why Learn More about Drainage?
- Broaden, deepen or refresh your knowledge
- Learn to manage your own property better
- Add to your skills and knowledge
- Strengthen your business or career potential.
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