Layout Planning

Part of Sanitation and Hygiene

The physical layout of a settlement determines whether contamination reaches your water, food, and people. Get the distances and elevations right from day one and you prevent disease passively — no daily effort required. Get them wrong and no amount of handwashing or latrine maintenance will save you. This guide covers the critical triangle of water-latrine-kitchen placement, topographic analysis, drainage design, growth planning, and practical details like nighttime latrine access.

The Critical Triangle

Every settlement layout begins with three structures and the distances between them:

1. Water source (well, spring, stream, cistern)
2. Latrine (pit, composting toilet, or any waste disposal point)
3. Kitchen (food preparation and cooking area)

The relationship between these three defines your settlement’s disease risk more than any other factor.

Minimum Distance Table

From → To	Minimum Distance	Critical Reason
Water source → Latrine	30 meters (50m in sandy soil, 100m in fractured rock)	Groundwater contamination — fecal pathogens can travel through soil to reach wells
Water source → Kitchen	15 meters (kitchen upstream or uphill)	Prevents wash water and food waste from contaminating the source
Kitchen → Latrine	30 meters	Fly travel distance — a fly leaving a latrine reaches food in the kitchen
Sleeping area → Latrine	15-50 meters	Too close = odor and contamination; too far = people won’t use it at night
Sleeping area → Kitchen	10-20 meters	Close enough for convenience; far enough to separate cooking smoke from sleeping
Any structure → Waste/refuse pit	20 meters	Odor, vectors, and runoff contamination

These Are Minimums, Not Recommendations

The distances above represent the absolute minimum for safety. Increase them whenever terrain allows. In particular, sandy or gravelly soils provide almost no filtration — fecal bacteria can travel 50+ meters through sand to reach a water source. When in doubt, add distance.

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Topographic Considerations

Flat ground makes layout easier but hides contamination flow. Sloped terrain reveals it — and demands that you get the hierarchy right.

The Elevation Hierarchy

The non-negotiable rule: contamination must never flow toward clean resources.

HIGHEST GROUND (uphill)
  ↓
  Water source
  ↓
  Kitchen / Cooking area
  ↓
  Sleeping / Living area
  ↓
  Washing area (greywater drainage)
  ↓
  Latrine
  ↓
  Waste pit / Compost
  ↓
LOWEST GROUND (downhill)

If your water source is at the bottom of a slope (a stream in a valley, a spring at the base of a hill), you must place all waste facilities downstream — never above the water source, even if it means longer walking distances.

Slope Assessment

Before placing any structure, walk the site during or immediately after rain and observe:

1. Where does water flow? Follow the rivulets. They show you exactly where contamination will travel.
2. Where does water pool? These spots will breed mosquitoes and collect waste runoff.
3. What is the overall slope direction? Stand at the proposed latrine site and confirm that surface water flows away from the water source and kitchen.

The Water Test

Pour a bucket of water at your proposed latrine site and watch where it flows. If any of it runs toward your water source, kitchen, or sleeping area, choose a different site. This 30-second test prevents months of contamination.

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Prevailing Wind Direction

Wind carries odor, airborne pathogens, smoke, and flying insects. Orienting your layout to the prevailing wind prevents all four from reaching the wrong places.

How to Determine Prevailing Wind

1. Observe for a full day — hang a strip of cloth from a pole and note the direction it blows most often
2. Check in both dry and wet seasons if possible — wind patterns can reverse
3. Ask local knowledge if available — long-term residents know the dominant wind

Wind-Based Placement Rules

Structure	Wind Relationship	Reason
Latrine	Downwind from all other zones	Odor and fly dispersal carried away from camp
Kitchen	Upwind from latrine and waste	Cooking smoke acceptable; latrine odor is not
Sleeping area	Upwind or crosswind from latrine	Odor and airborne pathogen reduction
Waste/compost pit	Downwind, same side as latrine	Consolidates odor sources on one side of camp
Smoke fire (for mosquito control)	Upwind of sleeping area	Smoke drifts over sleeping area, repelling mosquitoes

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Drainage Flow Mapping

Water does not stay where you put it. Every rainstorm redistributes surface contamination. Your layout must account for drainage flow.

Mapping Steps

1. Walk the site after heavy rain. Note every stream, rivulet, puddle, and saturated area.
2. Sketch the flow pattern. Arrows showing direction of water movement across the site.
3. Identify convergence points — where multiple flows meet. Never place a water source, kitchen, or sleeping area at a convergence point.
4. Plan drainage channels to intercept contaminated runoff before it reaches clean zones.

Drainage Channel Design

Feature	Specification
Depth	15-30 cm
Width	15-30 cm
Slope	2-5% grade (2-5 cm drop per meter of length)
Lining	Gravel, flat stones, or compacted clay — prevents erosion
Outlet	Direct to a soakaway pit (gravel-filled pit) or natural drainage, away from water source

Interceptor Ditches

Dig a crescent-shaped ditch uphill from your water source to intercept surface runoff before it reaches the source. This single ditch — 30 cm deep, 30 cm wide, curving around the uphill side of the well or spring — prevents most surface contamination from entering your water supply.

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Settlement Growth Planning

A layout designed for 10 people fails when the settlement grows to 30. Plan for growth from day one.

Growth Principles

1. Reserve latrine expansion space. A pit latrine fills in 6-12 months for a household, faster for a group. Identify 3-4 future latrine sites that maintain proper distances from water and kitchen.
2. Place the kitchen centrally. As the settlement grows outward, the kitchen should remain roughly equidistant from all sleeping areas. A kitchen at the edge of camp becomes inconvenient as the settlement expands in other directions.
3. Plan linear, not radial growth. A settlement that grows in a line along a ridge or riverbank maintains consistent distances from water and waste. A settlement that grows in all directions from a center eventually places new shelters too close to existing latrines or waste pits.
4. Mark reserved zones. Even before you need them, mark areas reserved for future latrines, water points, and waste pits. This prevents someone from building a shelter on the only viable future latrine site.

The Grid Approach

Lay out your settlement on a simple grid with consistent spacing (10-15 meters between shelter plots). Leave every third row empty as a service corridor for drainage, pathways, and future infrastructure. This feels wasteful with 5 families but saves enormous headaches with 50.

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Pathway Design

Paths are sanitation infrastructure, not just convenience features. A well-designed path keeps feet clean, enables nighttime movement, and prevents mud from becoming a disease vector.

Path Standards

Feature	Specification
Width	1-1.5 meters (two people can pass)
Surface	Gravel, wood chips, flat stones, or compacted clay — never bare mud
Drainage	Crowned (slightly higher in center) or sloped to one side with a drainage channel
Borders	Edged with stones or logs to prevent surface material from washing away

Critical Paths

These paths must be maintained to the highest standard:

1. Sleeping area → Latrine — the most-used path at night. Must be navigable in darkness.
2. Kitchen → Water source — used multiple times daily, often carrying heavy water containers. Must be stable footing.
3. Kitchen → Latrine — cooks must wash hands after latrine use before returning to food prep. A clear, short path encourages compliance.

Mud Prevention

Mud is not just unpleasant — it is a contamination transport medium. Fecal matter tracked through mud on boots reaches sleeping mats, cooking areas, and children’s play spaces.

• Gravel the worst spots. Even a 5 cm layer of gravel transforms a mud pit into a passable path.
• Install stepping stones across chronically wet areas where gravel is unavailable.
• Build raised walkways (log corduroys or plank paths) in areas that flood regularly.

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Nighttime Latrine Access

People will not use a latrine they cannot reach safely in the dark. And if they do not use the latrine, they defecate near their shelters — contaminating the entire sleeping zone.

Solutions

Method	Materials	Notes
Torch holders along the path	Forked sticks at 5-meter intervals holding pitch-soaked torches	Effective but requires nightly lighting. Fire risk.
Reflective markers	Light-colored stones or cloth strips at path edges	Visible in moonlight. Free. No fire risk.
Rope guide	Cord strung at waist height from sleeping area to latrine	Follow the rope in total darkness. Simple and effective.
Chamber pot system	Covered bucket at each shelter, emptied into latrine each morning	Eliminates nighttime walking entirely. Requires strict morning emptying discipline.
Phosphorescent markers	Certain fungi and minerals glow faintly — place at path edges if available	Rare but effective where available.

The Rope Guide

The simplest, most reliable nighttime latrine access system is a rope or cord tied between posts from the sleeping area to the latrine entrance. In total darkness, a person grabs the rope and follows it. No fire, no fuel, no maintenance beyond replacing the rope when it frays. Add a knot 3 meters before the latrine as a “you’re almost there” signal.

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Accessibility for Elderly and Children

A layout that works for healthy adults may exclude the most vulnerable — who are also the most likely to cause sanitation breaches if excluded.

For Elderly and Mobility-Impaired

• Place their shelter closest to the latrine — shortest possible path
• Ensure the path is level and firm — no steps, roots, or loose stones
• Consider a raised latrine seat rather than a squat pit — easier to use with joint problems
• Provide a chamber pot for nighttime use if the latrine path is too risky

For Children

• Children’s latrine area — a smaller, less deep pit near the sleeping area (but still maintaining minimum distances from water). Young children are afraid of deep, dark pits and will avoid them.
• Handwashing station at child height — a low platform or hanging water container with a tap that small hands can operate
• Teach the route — walk children along the latrine path daily until it is automatic

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Key Takeaways

1. The water-latrine-kitchen triangle is the foundation of settlement health. Get these distances and elevations right before placing anything else.
2. Water source highest, latrine lowest. Contamination flows downhill. Always place waste facilities below and downstream from clean resources.
3. Wind carries contamination. Latrines and waste pits go downwind. Kitchen and sleeping areas go upwind.
4. Map drainage before building. Pour water, watch where it goes, and plan accordingly. An interceptor ditch uphill from your water source prevents surface contamination.
5. Paths are sanitation infrastructure. Gravel, stones, or wood chips on every path between zones. Mud tracks fecal matter into clean areas.
6. Plan for growth. Reserve future latrine and waste sites now. A grid layout with service corridors scales; a haphazard layout does not.
7. Make the latrine reachable at night. A rope guide, reflective markers, or chamber pots ensure the latrine gets used 24 hours a day.