Mapping Your Property --- Sun, Wind, Water, and Soil

Permaculture's "observe and interact" principle — the first of its twelve principles — is not a warm-up activity to be done briefly before getting on to the real work. It is the real work. The observation phase, done rigorously and recorded systematically, is what distinguishes a land use plan that works from one that fails expensively. The map is the artifact that makes observation permanent and shareable.

This is not unique to permaculture. Traditional agricultural cultures developed observational knowledge about their land over generations — knowledge that was encoded in place names, land boundaries, planting calendars, and inherited practice. A farmer whose family had worked the same land for five generations knew, without measurement, where the cold air settled and where it did not, which knoll caught the first sun, which field stayed wet in the first rainy months. That knowledge took generations to accumulate. The mapping process is an attempt to build it intentionally, in years rather than generations.

The Four Variables in Technical Depth

Sun

Solar angle varies significantly by season and latitude. At 40° North latitude (roughly the latitude of Philadelphia, Denver, or Madrid), the sun is approximately seventy-three degrees above the horizon at solar noon in midsummer, and only about thirty-three degrees above the horizon at solar noon in midwinter. This forty-degree difference in angle means that a south-facing wall or window admits dramatically different amounts of light in winter versus summer — by design in passive solar architecture.

For land mapping, this means: - The shadow cast by a ten-foot wall, fence, or tree line at solar noon in winter extends approximately seventeen feet north (at 40° latitude) - The same obstacle in summer casts a shadow only a few feet long - Deciduous trees that shade in summer allow winter sunlight through when leaves are down — useful for understory perennial placement

Tools for solar mapping: A sun path diagram (downloadable free for any latitude), a physical observation on each solstice and equinox, and the Sunearthtools.com or Suncalc.org software allow you to calculate exactly where shadows will fall at any time of year, based on the height and location of obstructions you input.

Mark on your map: full-sun zones (six-plus hours direct sun, year-round), partial sun zones (three to six hours, or full sun in summer but shaded in winter), shade zones (less than three hours or only morning/afternoon sun). These zones determine what you can grow where — and how passively solar-optimized a structure in each location can be.

Wind

Wind has three critical dimensions: speed, direction, and turbulence. Speed determines energy potential (if you are considering small wind generation) and structural loads on buildings. Direction determines shelter requirements and ventilation opportunities. Turbulence — the chaotic flow patterns created by obstacles — is often more damaging than steady wind because it creates unpredictable high-velocity gusts.

Windbreaks reduce wind speed dramatically in their lee — a well-designed multi-row windbreak can reduce wind speed by fifty to seventy percent for a distance of ten to fifteen times its height downwind. The protected zone extends upwind as well, approximately two to five times the height of the windbreak. A windbreak thirty feet tall protects an area extending from sixty to one hundred fifty feet downwind.

Mapping prevailing wind: Set a weather vane or simple ribbon flag and observe over two to four weeks in each season. Record the primary direction for each season. In many temperate locations, winter winds come from the northwest and summer breezes from the southwest. Your windbreak should protect against the former; your building and garden placement should capture the latter for natural ventilation.

Turbulence zones: These occur on the downwind face of any solid obstruction — a building, dense hedge, or solid fence. Turbulence zones extend one to two heights downwind of the obstacle. If you are locating a greenhouse or young orchard, avoid these zones. Permeable windbreaks (mixed rows with some gaps and varying heights) create less turbulence than solid barriers.

Water

The hydrological map of your property is built from three observations: surface drainage, groundwater indicators, and water infiltration rates.

Surface drainage: After any significant rainfall, walk the property and observe. Mark on your map the flow lines (channels that fill temporarily), the collection points (low areas where water accumulates), and the rapid-drain areas (higher ground or coarse soil that never holds water). These observations should be repeated across multiple storms over at least one full year — a one-time observation misses seasonal variation.

The Keyline design system, developed by P.A. Yeomans in Australia, provides a systematic method for reading landscape water movement and designing earthworks to maximize infiltration. Its central insight is that the keyline — the inflection point on a valley slope where the gradient changes from steepening to flattening — is the point from which to design water spreading earthworks. Water harvested at the keyline can be directed across a slope to distribute rainfall more evenly and charge subsoil water throughout the property.

Groundwater indicators: Certain plant species indicate high water tables or seasonal saturation. Willows, alders, sedges, and cattails in the wild indicate reliable water. Rush (Juncus) species indicate seasonally wet conditions. Persistent green patches in a drought indicate groundwater access. These indicators, mapped, give you a groundwater depth map at no cost.

Infiltration rate: Dig a hole twelve inches in diameter and twelve inches deep. Fill it with water. Note how long it takes to drain. If it drains in under thirty minutes, you have excellent drainage. If it takes hours, you have slow drainage and should not site water-sensitive plantings (most fruit trees) there without amendment or raised beds. If it never fully drains, you have an impervious layer or high water table and should design for water-tolerant species (willow, alder, elder, watercress, pond plants).

Soil

A professional soil survey — the Web Soil Survey (websoilsurvey.nrcs.usda.gov) for US properties — provides a county-level soil map overlaid on your parcel. This is free, highly detailed, and available for most of the United States. It identifies soil series, drainage class, depth to bedrock, and limitations for various uses. This is the first step before any on-site work.

On-site soil pits refine the survey data at your specific location. At minimum, dig four pits to eighteen-inch depth at representative locations (hilltop, mid-slope, valley bottom, flat area). Observe and record: - Topsoil depth (the dark organic horizon) - Subsoil character: color (gray or blue-gray indicates poor drainage and anaerobic conditions; bright orange or red indicates good oxidation and drainage), texture (squeeze a handful: clay holds its shape, sand falls apart, loam is intermediate), and structure (blocky or prismatic clods indicate clay-dominated soil; granular crumble indicates good aggregate structure from biological activity) - Presence of rocks, hardpan, or impervious layers - Root penetration depth

Soil test at least one sample from each distinct zone. A basic test from a land-grant university cooperative extension lab costs ten to twenty-five dollars and provides pH, phosphorus, potassium, calcium, magnesium, and organic matter percentage. This baseline data is essential for fertility planning.

Integrating the Four Maps

The full land map is a composite of all four variables, plus existing infrastructure, structures, trees, and access ways. Creating this map is iterative — it begins with a base layer (property outline, structures, major trees) and gains layers over time as observation accumulates.

Working tools: - Paper graph paper at a scale of one inch to ten feet for small properties; larger scale for larger properties - Digital alternatives: Google Earth with the polygon measurement tool, or GIS software (QGIS is free and powerful) - A compass for establishing cardinal directions - A measuring tape or GPS device for accurate placement of features - A field notebook for dated observations

The map should be annotated with dates and observations rather than conclusions. Write "water pooled here 3/15/25 after 2-inch rain" rather than "wet spot." Dated observations are data. Conclusions can be revised as data accumulates; observations cannot.

Design Decisions the Map Enables

With a complete observational map, these design decisions become straightforward rather than speculative:

Garden placement: Full-sun, south-facing zone with good drainage, frost-free location (on or near a slope where cold air drains away), proximity to water source.

Orchard placement: Frost-free (avoid frost pockets), good air drainage (moving air reduces fungal pressure), protected from coldest winter winds, accessible for harvest.

Structure siting: South-facing for passive solar, sheltered from prevailing winter wind, on well-drained soil or elevated site, avoiding seasonal floodplains.

Pond placement: Natural low point in drainage pattern, clay or impermeabile soil for holding water without liner, catchment area upslope sufficient to maintain water level.

Windbreak placement: Upwind of vulnerable assets (garden, orchard, buildings) at appropriate distance to create protected zone without shading.

Compost and fertility systems: Slightly downslope from gardens so liquid nutrients flow toward root zones rather than away; accessible for regular additions.

The map is a permanent investment. The time spent building it — two to five hours of field observation per season across the first year, then ongoing annotation — pays returns in every design decision made for the life of the property. A property that is understood is a property that can be managed with the grain of its natural systems rather than against them. That alignment reduces labor, reduces inputs, and produces better outcomes.

Map the land before you plan it. Plan it before you work it. That sequence is not preliminary — it is the work.