Site Works and Landscaping

1

This section covers site analysis and the relationship of natural systems components — micro and macro climate, ecology, soils and subsurface conditions, physiographic character, visual character, and land use — along with site factors: parameters and geometric properties of a given site and contextual mapping.

2

Natural Systems Components in Site Analysis Component Description Macro-climate The general regional climate (temperature range, rainfall, seasonal pattern) within which the site sits Micro-climate Localized climatic variation at the site scale, influenced by topography, vegetation, water bodies, and surrounding built form (e.g. shaded/sheltered pockets, wind funnelling between buildings) Ecology The site's living systems — existing vegetation, habitat, and species present — and their interrelationships, relevant to conservation and integration into the design Soils and subsurface conditions Soil type, depth, bearing capacity, groundwater level, and any subsurface hazards/constraints (e.g. unstable strata, high water table) Physiographic character The site's landform character — slope, elevation, drainage pattern — within its broader physiographic setting (e.g. mountain, hill, terai) Visual character The site's visual qualities: views into and out of the site, visual landmarks, scenic quality, and visual context of surrounding development Land use Existing and permitted land use of the site and surrounding parcels, informing compatible design response and use allocation Site Factors Site parameters include size, shape, orientation, boundary configuration, access points, and legal/zoning constraints (FAR, setback, ground coverage — Ch.

3

Geometric properties of a site (area, perimeter, frontage width, depth, aspect ratio) directly influence buildable form, massing options, and circulation layout.

4

Contextual mapping systematically documents the site's surroundings — adjacent land uses, building heights/character, infrastructure, movement patterns — providing the base information for a design response that is genuinely responsive to its context.

1

This section covers soil types, soil investigation methods, and calculating and improving bearing capacity, along with basic concepts of topography, landforms, and contours.

2

Soil Types and Investigation Soil Type General Characteristics Gravel/coarse-grained soil High bearing capacity, good drainage, generally stable for foundations Sandy soil Moderate bearing capacity, free-draining, but can be prone to settlement if loose/uncompacted Silty soil Low-to-moderate bearing capacity, poor drainage, prone to frost heave/erosion Clayey soil Variable bearing capacity depending on consistency; prone to shrink-swell behaviour with moisture change, low permeability Soil investigation is carried out through trial pits (shallow, visual/hand sampling), boring/drilling (deeper strata sampling), and in-situ tests (e.g.

3

Standard Penetration Test/SPT) and laboratory tests (grain size, Atterberg limits, shear strength, consolidation) to characterize subsurface conditions.

4

Calculating and Improving Bearing Capacity Bearing capacity (the soil's capacity to safely support the applied load without excessive settlement or shear failure) is estimated from soil investigation data (e.g.

5

SPT N-values), classical bearing capacity theory/formulae, or empirical correlations, and is compared against the pressure the proposed foundation will impose.

6

Improving bearing capacity where the natural soil is inadequate can involve: compaction (mechanical densification), soil replacement (removing poor soil and replacing with compacted granular fill), stabilization (adding lime/cement to improve strength), or adopting a deep foundation system (piles) to bypass weak strata (Ch.

7

Topography, Landforms, and Contours Topography describes the shape and features of the land surface (elevation, slope, relief).

8

Landforms are natural features of the terrain (hills, valleys, ridges, plateaus, depressions) that shape site planning and drainage response.

9

Contours are lines on a plan connecting points of equal elevation, used to represent and analyse topography: closely spaced contours indicate steep slopes, widely spaced contours indicate gentle slopes, and contour patterns reveal ridges (V pointing downhill), valleys (V pointing uphill), and depressions.

1

This section covers the synthesis and interpretation of site data: design response through programme ‘fit’ for the site, master planning, site planning, grading, site layout and setting out, excavation, trenching, and drainage layout.

2

Design Response Through Programme 'Fit' Synthesizing site analysis data (Ch.

3

8.1–8.2) with the project's functional programme produces a design response where the built form ‘fits’ the site — respecting its climate, ecology, soil, topography, and context rather than imposing an unrelated, generic solution.

4

This synthesis directly parallels the general design process (Ch.

5

4.4/5.2), with site data forming a critical input alongside the functional brief.

6

Master Planning, Site Planning, and Grading Activity Description Master planning/site planning Organizing building footprint(s), circulation, open space, parking, and infrastructure across the site in response to the synthesized site data and programme Grading Reshaping the ground surface (cut and/or fill) to achieve required levels for building pads, drainage falls, and accessible routes, while balancing earthwork (minimizing net cut/fill where possible) and respecting existing topography Site layout and setting out Precisely establishing the position (using survey coordinates/benchmarks) of building corners, grid lines, and key site features on the ground, translating the design drawings into a physical, buildable reality Excavation, Trenching, and Drainage Layout Excavation removes soil/rock to reach foundation formation level or achieve required grading, with attention to safe slope angles/shoring (Ch.

7

2.4) to prevent collapse.

8

Trenching is excavation for linear elements (foundations, service pipes/cables), requiring appropriate width, depth, and safety measures (shoring/battering) given the trench's depth-to-width ratio and soil conditions.

9

Drainage layout plans the site's surface water management — grading falls directing runoff to collection points, storm drains/swales, and connection to a public drainage system or on-site retention/soakaway — preventing water accumulation against foundations and controlling runoff.

1

This section covers hard and soft landscape elements and their application, including the design resources involved in landscaping: landforms, water, vegetation, surface materials, outdoor fittings, and construction materials, structures, and installations.

2

Soft Landscape Elements Element Application Landforms Shaping the ground (mounding, terracing, berms) to create spatial definition, control views, manage drainage, or provide acoustic/visual buffering Water Ponds, streams, fountains, and reflecting pools used for aesthetic, microclimatic (cooling), and ecological (habitat) purposes within a landscape design Vegetation Trees, shrubs, groundcover, and lawn selected for their form, seasonal character, shade/screening function, habitat value, and compatibility with the local climate/soil Hard Landscape Elements Element Application Surface materials Paving (stone, brick, concrete unit pavers, gravel), decking, and other ground- plane finishes selected for durability, permeability, texture, and visual character Outdoor fittings Site furniture (benches, bollards, litter bins), lighting fixtures, signage, and other functional accessories supporting outdoor use and wayfinding Construction materials, structures, and installations Retaining walls, pergolas, gazebos, fences/walls, steps/ramps, and other built landscape structures providing spatial definition, access, or shelter Application Principles Effective landscape design integrates hard and soft elements together, balancing durability/maintenance needs (favouring hard elements in high-use areas) with ecological/microclimatic/aesthetic benefits (favouring soft elements), appropriate to the specific site and programme.

3

Material and plant selection should be climate- and context-appropriate (locally available, suited to the site's soil/climate/water availability) to ensure long-term sustainability and reduced maintenance burden.

1

This section covers the types, roles, and importance of open spaces, their historical use and nature, and contemporary typologies of open spaces with a particular focus on the urban context.

2

Types, Roles, and Importance of Open Space Type Role/Importance Public parks/gardens Provide recreation, respite, and social gathering space; contribute to urban ecology and microclimate moderation Plazas/squares Serve as civic gathering spaces, often adjacent to significant public buildings, supporting markets, ceremonies, and everyday social life Playgrounds Dedicated recreational space for children's play and development Green corridors/greenways Linear open space (often along waterways or old rail lines) providing connectivity for pedestrians/cyclists and ecological continuity Institutional/private open space Open space associated with a specific institution or private property (school grounds, residential courtyards), serving that user group's needs Historical Use and Nature of Open Spaces Historically, open spaces (such as the traditional chowk/courtyard, dabali, or market square in the Nepalese context — Ch.

3

1.2) served combined civic, ceremonial, commercial, and social functions integrated into the fabric of settlements, rather than being conceived as separate, purely recreational amenities.

4

In many historical urban traditions, open space was carefully proportioned and enclosed by surrounding built form, creating a strong sense of place and defined civic identity (relating to Ch.

5

3.5's concepts of space/place).

6

Contemporary Urban Open Space Typologies Contemporary urban open space typologies include: pocket parks (small, infill urban green spaces), linear parks/greenways, waterfront open space (redeveloped riverside/lakefront public realm), rooftop/podium open space (in dense urban contexts with limited ground-level land), and multi-functional plazas (combining civic, commercial, and recreational uses).

7

Contemporary open space design increasingly emphasizes accessibility/inclusivity (Universal Design — Ch.

8

5.2), ecological function (stormwater management, urban biodiversity), and adaptable/flexible programming to serve diverse and changing community needs.

1

This section covers miscellaneous landscape typologies — roof gardens, atriums, roadside plantations, avenues, indoor landscape, and children's play areas and their design — along with an understanding of environment and ecology for architectural design.

2

Landscape Typologies Typology Description/Design Considerations Roof gardens Vegetated open space on a building's roof; requires waterproofing/drainage design, adequate structural load capacity, and appropriate lightweight growing medium/plant selection Atriums Enclosed (often glazed) internal courtyard/void spaces within a building, frequently landscaped, providing daylighting, ventilation, and an indoor-outdoor transitional quality Roadside plantations/avenues Rows of trees planted along roads/streets, providing shade, visual/acoustic buffering, aesthetic character, and pedestrian comfort Indoor landscape Planting integrated within interior building spaces (potted plants, green walls, indoor planters), improving air quality, aesthetics, and occupant wellbeing Children's play area Dedicated outdoor (or indoor) space with age-appropriate play equipment, safety surfacing (impact-absorbing), clear sightlines for supervision, and shade provision Understanding Environment and Ecology for Architectural Design Architectural design should be informed by an understanding of the broader environment and ecology within which a building/site sits — including ecosystem services (clean air/water provision, temperature regulation), habitat/biodiversity considerations, and the building's overall environmental footprint.

3

This understanding supports design decisions that minimize negative ecological impact (habitat disruption, increased runoff, heat island effect) and, where possible, contribute positively (habitat creation, permeable surfaces, native/climate-appropriate planting, stormwater management integration).

4

Ecological/environmental considerations should be integrated from the earliest design stages (site analysis, Ch.

5

8.1) rather than treated as an afterthought applied only to landscaping at project completion.