# Public Space Design Public spaces are the shared rooms of the city — streets, squares, parks, waterfronts, markets, and civic forecourts where the public life of a community is enacted. Their quality determines whether a city is merely inhabited or genuinely liveable. For the practicing architect and urban designer, public space design demands the integration of landscape, movement, microclimate, social behaviour, safety, accessibility, and civic identity into places that are at once functional, beautiful, and democratic. --- ## Table of Contents - [Typologies of Public Space](#typologies-of-public-space) - [Design Principles](#design-principles) - [Spatial Enclosure and Proportion](#spatial-enclosure-and-proportion) - [Microclimate Design](#microclimate-design) - [Movement and Access](#movement-and-access) - [Landscape and Planting](#landscape-and-planting) - [Street Furniture and Materials](#street-furniture-and-materials) - [Lighting Design](#lighting-design) - [Safety and Inclusivity](#safety-and-inclusivity) - [See Also](#see-also) --- ## Typologies of Public Space | Type | Character | Scale | Examples | |------|-----------|-------|---------| | **Civic square** | Formal; institutional; ceremonial | 40-150m across | Piazza San Marco; Trafalgar Square; India Gate plaza | | **Market square** | Active; commercial; flexible | 30-80m | Borough Market; Covent Garden; Jemaa el-Fna | | **Neighbourhood square** | Intimate; residential; social | 20-50m | London squares; Barcelona superblock plazas | | **Pocket park** | Small; green; refuge | 10-30m | Paley Park NYC; London churchyard gardens | | **Urban park** | Landscape; recreation; ecology | 0.5-100+ hectares | Central Park; Hyde Park; Lalbagh Bangalore | | **Waterfront promenade** | Linear; views; leisure | Variable length | South Bank London; Marine Drive Mumbai | | **Pedestrian street** | Linear; commercial; social | 10-20m wide | Strøget Copenhagen; Grafton Street Dublin | | **Playground** | Play; children; families | 200-5,000 m² | Natural play; inclusive play; adventure play | | **Community garden** | Growing; participation; ownership | 100-2,000 m² | Allotments; guerrilla gardens; urban farms | --- ## Design Principles ### Jan Gehl's Twelve Quality Criteria Gehl's framework (from *Cities for People*) organises public space quality into three themes: **Protection**: 1. Protection against traffic and accidents — feeling safe 2. Protection against crime and violence — feeling secure 3. Protection against unpleasant sensory experiences — wind, rain, noise, pollution **Comfort**: 4. Opportunities for walking — room; accessibility; interesting facades 5. Opportunities for standing/lingering — edge effects; attractive zones 6. Opportunities for sitting — primary and secondary seating; views; sun/shade 7. Opportunities for seeing — sightlines; lighting; interesting visual range 8. Opportunities for hearing/talking — low ambient noise; human-scale distances 9. Opportunities for play/exercise — day and night; summer and winter; all ages **Delight**: 10. Scale — buildings and spaces dimensioned for human comfort 11. Opportunities to enjoy positive climate — sun; warmth; shelter 12. Positive sensory experiences — quality materials; vegetation; water; art ### William H. Whyte's Observations From *The Social Life of Small Urban Spaces*: - People sit where there are places to sit (supply creates demand) - **The street is the river of life** — connection to the street is essential - **Triangulation**: Elements that catalyse social interaction (performers, food, views, art) - Sun, food, and seating are the three essentials - People gravitate to edges, not open centres - Water features attract activity in all seasons --- ## Spatial Enclosure and Proportion The sense of enclosure — the feeling of being in a room rather than an open field — is fundamental to comfortable public space: | Ratio (Height : Width) | Spatial Quality | Application | |------------------------|----------------|------------| | >1:1 | Enclosed; intimate; potentially claustrophobic | Narrow streets; medieval lanes | | 1:1 to 1:2 | Strongly enclosed; comfortable; urban | Traditional streets; small squares | | 1:3 to 1:4 | Moderate enclosure; spacious but defined | Civic squares; boulevards | | 1:5 to 1:6 | Weakly enclosed; beginning to feel open | Large civic squares | | <1:6 | Unenclosed; may feel exposed without other definition | Parks; waterfronts (use trees/structures) | **Gordon Cullen's serial vision**: Spaces should unfold as sequences — a series of revelations as one moves through connected spaces. Avoid spaces that can be comprehended in a single glance. **Rob Krier's spatial types**: Squares derive their character from their geometric form — circular (centripetal), rectangular (directional), triangular (dynamic), or irregular (organic). --- ## Microclimate Design Public space comfort depends heavily on microclimate — sun, wind, temperature, and precipitation: ### Sun Access | Latitude | Design Strategy | |----------|----------------| | Northern Europe (50-60°N) | Maximise south-facing sun exposure; south-oriented seating areas | | Mediterranean (35-45°N) | Provide shade for summer; sun pockets for winter | | Tropical (0-25°N/S) | Shade is essential year-round; canopy trees; colonnades | **Target**: At least 50% of the principal seating area should receive at least 2 hours of direct sunlight on the spring equinox. ### Wind Mitigation | Wind Speed at Pedestrian Level | Effect on Activity | |-------------------------------|-------------------| | <5 m/s | Comfortable for sitting | | 5-8 m/s | Comfortable for standing; uncomfortable for sitting | | 8-12 m/s | Uncomfortable for standing; difficult to walk | | >12 m/s | Dangerous; people seek shelter | **Mitigation strategies**: Tree planting (porous windbreak); pergolas; built windbreaks at 60-70% porosity (more effective than solid walls, which create turbulence); building orientation to deflect prevailing winds; avoiding wind acceleration between tall buildings (Venturi effect). ### Rain Protection | Strategy | Application | |----------|------------| | Colonnades and arcades | Ground-floor covered walkways; commercial frontages | | Canopies and pergolas | Seating areas; waiting points; market stalls | | Tree canopy | Deciduous trees provide summer shade and partial rain protection | | Retractable covers | Market squares; event spaces | --- ## Movement and Access ### Pedestrian Hierarchy | Route Type | Minimum Width | Design Speed | |-----------|---------------|-------------| | Major pedestrian street | 6-12m (clear width) | Leisurely (3-4 km/h) | | Secondary pedestrian route | 3-6m | Normal (4-5 km/h) | | Shared surface | 6-10m (total) | Slow (max 20 km/h vehicles) | | Pedestrian lane/alley | 2-3m | Leisurely | ### Inclusive Access | Requirement | Standard | |------------|---------| | Gradient (accessible route) | Maximum 1:20 (5%); ramps 1:12 (8.3%) with handrails | | Cross-fall | Maximum 1:40 (2.5%) | | Step-free routes | To all principal spaces and facilities | | Tactile paving | At crossing points; top/bottom of steps; platform edges | | Seating intervals | Every 50m along principal routes (BS 8300) | | Rest points | Level areas with seating at maximum 100m intervals on slopes | See [[Universal Design Principles]] and [[Urban Design Fundamentals]] for comprehensive accessibility standards. --- ## Landscape and Planting | Element | Design Role | |---------|------------| | **Canopy trees** | Shade; spatial definition; seasonal change; wind mitigation; carbon sequestration | | **Understorey planting** | Edge definition; biodiversity; visual interest; sensory experience | | **Lawn/grass** | Informal recreation; soft surface; visual relief | | **Rain gardens/bioswales** | Sustainable drainage; biodiversity; ecological education | | **Water features** | Sensory delight; microclimate cooling; gathering focus; sound masking | | **Raised planters** | Accessible gardening; seating edges; spatial division | **Tree selection criteria**: Ultimate canopy size; root spread (avoid conflict with utilities and paving); drought tolerance; wind resistance; disease resistance; seasonal interest; native or climate-adapted species. **Soil volume**: Urban trees require minimum 15-20 m³ of uncompacted soil per tree for long-term health. Use structural soil systems, suspended pavement, or continuous planting trenches beneath paving. --- ## Street Furniture and Materials ### Paving Materials | Material | Character | Durability | Accessibility | |----------|-----------|-----------|--------------| | **Natural stone (granite setts)** | High quality; traditional; heritage | 100+ years | Can be uneven; specify sawn/flamed finish | | **Natural stone (yorkstone flags)** | Premium; warm; British tradition | 80-100 years | Excellent when flat-laid | | **Concrete block paving** | Versatile; cost-effective; permeable options | 25-40 years | Good; consistent surface | | **Concrete flags** | Standard; utilitarian | 20-30 years | Good | | **Asphalt** | Smooth; continuous; cost-effective | 15-25 years | Excellent | | **Bound gravel** | Natural; semi-formal | 10-20 years | Moderate; can be difficult for wheelchair | | **Timber decking** | Warm; waterfront; elevated | 15-30 years | Slip risk when wet; specify anti-slip | ### Furniture | Element | Spacing/Provision | Key Principle | |---------|-------------------|--------------| | **Seating** | Every 50-100m on routes; clustered at gathering points | Variety: benches, walls, steps, moveable chairs | | **Litter bins** | Every 50-100m; at entrances; at seating | Covered; dog-proof; regularly maintained | | **Cycle stands** | At entrances; at transport nodes; visible | Sheffield stand (simple, effective); covered where possible | | **Bollards** | Hostile vehicle mitigation; edge delineation | Integrated; not cluttering; PAS 68 rated where required | | **Signage/wayfinding** | Decision points; entrances; intersections | Clear; consistent; accessible; multilingual where appropriate | | **Water fountains** | At regular intervals in parks | Accessible; sustainable alternative to bottled water | --- ## Lighting Design | Approach | Purpose | Application | |----------|---------|------------| | **Functional lighting** | Safe pedestrian movement; facial recognition | Paths; crossings; entrances (minimum 10-20 lux) | | **Accent lighting** | Highlight features; create depth and drama | Trees; facades; water; art | | **Ambient lighting** | Overall character; atmosphere | Low-level; warm colour temperature (2,700-3,000K) | | **Festive/temporary** | Events; seasonal; celebration | Catenary lighting; projections; temporary installations | **Principles**: Avoid light pollution (full cut-off luminaires); respect ecological sensitivity (darkness for bats and nocturnal species); ensure even illumination for safety without harsh overlighting; warm colour temperatures for social/residential areas. --- ## Safety and Inclusivity | Principle | Implementation | |-----------|---------------| | **Natural surveillance** | Active frontages overlooking the space; residential upper floors; no hidden corners | | **Clear sightlines** | Maintain visibility through planting; avoid dense shrubs at eye level | | **Diversity of use** | Encourage different activities at different times — reducing periods of emptiness | | **Lighting for safety** | Illuminate routes, entrances, and gathering areas; minimum 10 lux on paths | | **Inclusive design** | Step-free access; seating with armrests; quiet spaces; sensory variety | | **Gender-inclusive** | Sightlines; escape routes; adequate lighting; avoid dead ends | | **Child-friendly** | Safe boundaries; varied play; visible from seating areas | --- ## See Also - [[Urban Design Fundamentals]] - [[Universal Design Principles]] - [[Biophilic Design]] - [[Sustainable Drainage Design]] - [[Daylighting Design Principles]] --- #urban #publicspace #landscape #placemaking #inclusivity #microclimate