Sovereignty Module: Direct the Flow
Direct the Flow
Complete Irrigation, Water Management, and Drainage Guide
Complete Irrigation, Water Management, and Drainage Guide
Water is the single greatest determinant of agricultural success. Irrigation transforms marginal land into productive farmland and drought-proofs food production. This campaign covers water sourcing, delivery systems, and drainage.
Chapter 1: Water Sources
| Source | Reliability | Quality | Infrastructure |
|---|---|---|---|
| River/stream (gravity diversion) | High (perennial streams) | Variable | Diversion dam, canal |
| Spring | Very high | Usually excellent | Collection box, pipe |
| Well (hand-dug or drilled) | High | Usually good | Pump (hand, wind, or solar) |
| Rainwater harvesting | Seasonal | Excellent | Catchment, storage tank |
| Pond/reservoir | Moderate-high | Variable | Dam, spillway |
| Snowmelt | Seasonal | Excellent | Storage required |
Chapter 2: Irrigation Methods
| Method | Efficiency | Complexity | Best For |
|---|---|---|---|
| Flood (basin) | 40-60% | Very low | Rice, flat land, clay soil |
| Furrow | 50-70% | Low | Row crops, sloped land |
| Border strip | 50-65% | Low | Pasture, grain, flat land |
| Sprinkler | 70-85% | Moderate-high | Any crop, undulating terrain |
| Drip/trickle | 85-95% | Moderate | Vegetables, orchards, water-scarce areas |
| Sub-irrigation | 75-85% | Moderate | High water table areas |
| Manual (watering can/bucket) | 80-90% | Very low | Small gardens |
Chapter 3: Gravity-Fed Canal System
| Component | Function | Design Rule |
|---|---|---|
| Diversion dam/weir | Raises water level to enter canal | Must not block fish passage entirely |
| Head gate | Controls flow into canal | Adjustable (board, slide gate) |
| Main canal | Carries water from source | Slope: 0.1-0.5% (1-5 feet per 1000 feet) |
| Lateral canals | Distribute to fields | Smaller than main, same slope rule |
| Turnouts | Control flow to individual fields | Gate or pipe |
| Check structures | Control water level in canal | Boards, concrete, or earth |
| Spillway/wasteway | Handles excess water safely | Sized for maximum expected flow |
| Lining (optional) | Reduces seepage losses | Clay, concrete, or plastic |
Canal sizing: Flow (cubic feet per second) = Area x Velocity. For earth canals, maximum velocity 2-3 fps to prevent erosion. For lined canals, up to 5 fps.
Chapter 4: Drip Irrigation
| Component | Material | Function |
|---|---|---|
| Water source (elevated tank) | Tank, barrel, or header | Provides pressure (4+ feet elevation) |
| Filter | Screen or sand filter | Prevents emitter clogging |
| Main line | 1-2 inch pipe or hose | Carries water from source to field |
| Lateral lines | 1/2-5/8 inch tubing | Runs along crop rows |
| Emitters/drippers | Small orifice or porous tubing | Delivers water slowly to each plant |
| End caps | Plugs or fold-over clips | Closes line ends (removable for flushing) |
Low-tech drip: Punch small holes (heated nail) in plastic tubing every 12-18 inches. Elevate water source 4+ feet above field. Gravity provides pressure. Filter water through cloth to prevent clogging.
Chapter 5: Water Lifting Devices
| Device | Lift Height | Flow Rate | Power Source |
|---|---|---|---|
| Shaduf (counterweighted lever) | 6-10 feet | Low | Human |
| Persian wheel (chain of buckets) | 10-30 feet | Moderate | Animal |
| Archimedes screw | 3-15 feet | High | Human or water |
| Treadle pump | 10-25 feet | Moderate | Human (foot-powered) |
| Ram pump (hydraulic ram) | 10-100+ feet | Low | Water flow (no external power) |
| Windmill pump | 10-200 feet | Moderate | Wind |
| Hand pump (piston) | 10-200 feet | Low | Human |
Ram pump: Uses the energy of flowing water to pump a portion of that water to a higher elevation. No fuel, no electricity. Requires: flowing water source with at least 3 feet of fall, and at least 7x the flow you want to pump.
Chapter 6: Drainage
| Problem | Solution | Method |
|---|---|---|
| Waterlogged soil | Surface drainage | Grade land to drain, open ditches |
| High water table | Subsurface drainage | Buried perforated pipe (tile drains) at 3-4 foot depth |
| Salinization | Leaching + drainage | Over-irrigate to flush salts, drain excess |
| Erosion | Contour farming, terracing | Plow and plant along contour lines |
| Flooding | Levees, flood channels | Earth berms along waterways |
Reference Card
- Drip irrigation is 85-95% efficient: best for water-scarce areas
- Gravity canal slope: 0.1-0.5% (1-5 feet drop per 1000 feet of length)
- Ram pump lifts water using only water flow energy: no fuel, no electricity
- Elevated tank (4+ feet) provides enough pressure for simple drip systems
- Filter all irrigation water to prevent emitter clogging
- Drainage is as important as irrigation: waterlogged soil kills crops
- Contour farming and terracing prevent erosion on sloped land
- One inch of water per week is the standard crop water requirement
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