The storage and utility zone holds granaries, root cellars, smokehouses, drying sheds, water tanks and the waste and sanitation works, and it sits between the fields and the housing so that harvest comes in and waste goes out without crossing the communal core. Waste and sanitation belong downhill and downwind of every water source, kept at least 30 m away where the ground cannot be tested and farther in gravel.
Part of Settlement Layout for 150 People
The storage and utility zone is the working back-of-house of a settlement: the buildings and works that keep food, water and waste moving.
Waste Goes Out The Way Food Comes In, Never Past The Well
The layout guide lists the contents: granaries, root cellars, smokehouses and drying sheds; main water tanks and any treatment; composting-toilet collection points and greywater systems; and organised salvage storage. It places the zone between agriculture and housing. Root cellars and ice houses go on north-facing slopes where possible; that advice is for the northern hemisphere, and in the southern hemisphere the cool slope faces south.
Sanitation Distances Depend On The Ground
The guide says all waste and sanitation infrastructure sits downhill and downwind of water sources. Downhill is necessary but not sufficient. The corpus position (Source Protection):
- 30 m is the Sphere Handbook default from a latrine to a water source where soil permeability cannot be tested, with the pit bottom at least 1.5 m above the water table.
- WHO’s 15 m applies only for a pit down gradient of the source.
- The ground sets the real distance: about 10 m in silt, up to 500 m in gravel, and 40 m when the ground is unknown.
- In fractured rock or karst limestone, horizontal distance is no protection at all; use a different source or a sealed borehole.
Worked Example: How Fast Do Pits Fill?
Inputs: 150 people; the pit-latrine guide’s working constant of 50 L of waste per person a year.
- Volume a year: 150 × 50 L = 7,500 L.
- In cubic metres: 7,500 ÷ 1,000 = 7.5 m³ a year.
- A 2 m deep pit holds 7.5 ÷ 2 = 3.75 m² of plan area per year.
That is why the layout guide assigns one composting toilet per household, with a collection point, rather than a new pit each time: a settlement digging pits would be moving and closing about 7.5 m³ of full pit every year (Pit Latrine Design, Composting Toilet Systems).
Method
Step 1: Place stores for grain and food on dry, drained ground, raised and rodent-proofed (Granary Design); more in Storage Buildings Design.
Step 2: Place the tanks where gravity serves the housing and workshops (Tank Placement).
Step 3: Place the waste works last, downhill and downwind, after confirming the ground type.
Step 4: Keep smokehouses and fuel at least 10 m from other buildings.
Common Mistakes
- Siting a compost heap or pit by distance alone over fractured rock.
- Locating the salvage yard beside housing; scrap burns and cuts.
- Mixing food stores with waste — rats and flies move from one to the other.
Safety
Smokehouses, fuel and compost
A smokehouse is a fire source: keep it 10 m from any building and from fuel. Compost heaps generate heat and can ignite when dry and deep. Never enter a pit, tank or cellar without ventilating it first; carbon dioxide and other gases collect in low enclosed spaces.
What’s Next
- Learn next: Water Distribution Routes — pipes between tanks and users
- Combine with: Infrastructure Scalability — sizing for growth