Tempo:
Surface Drainage, Driveways and Walkways
Site planning and grading must be considered at the initial planning stage (see Chapter 2). To create a successful landscape plan, the needs for surface drainage, driveways and walkways must be assessed. Driveways and walkways should be made of materials in character with the house and yard.
Slope all surfaces away from the foundation walls at least 5 per cent, and provide a 10 per cent slope for the first 2 m (6 ft. 6 in.) to ensure a positive slope after foundation backfill settles. Impermeable surfaces adjacent to the house, such as driveways, should have a slope of at least 2 per cent.
SURFACE DRAINAGE
Build a swale (a gently sloping ditch) where the drainage slope around the house meets a reverse slope. For example, if a lot slopes up from the front to the rear, the swale should be located at the sides of the house so that the surface water flows along the swale, around the house, and out toward the street or roadside ditch (see Figure 3 on p. 13).
Consider drainage in the initial planning stage to remove rain and snowmelt from the site, and give consideration to the location of the house on a property, its elevation relative to the site and utilities. Establish a surface drainage pattern that will drain the entire lot and direct water away from the house (see Figure 3 on p. 13). Driveways and walkways should help drainage, not interfere with it. If a house uses well water, all surface drainage must be directed away from the well to avoid contaminating the water supply.
DRIVEWAYS A driveway should be at least 2.4 m (8 ft.) wide and 3 m (10 ft.) wide when it also serves as a walkway. It should have a slope suitable for traction in winter conditions, provide good visibility at the street intersection and be
Site planning and grading must be considered at the initial planning stage (see Chapter 2). To create a successful landscape plan, the needs for surface drainage, driveways and walkways must be assessed. Driveways and walkways should be made of materials in character with the house and yard.
Slope all surfaces away from the foundation walls at least 5 per cent, and provide a 10 per cent slope for the first 2 m (6 ft. 6 in.) to ensure a positive slope after foundation backfill settles. Impermeable surfaces adjacent to the house, such as driveways, should have a slope of at least 2 per cent.
SURFACE DRAINAGE
Build a swale (a gently sloping ditch) where the drainage slope around the house meets a reverse slope. For example, if a lot slopes up from the front to the rear, the swale should be located at the sides of the house so that the surface water flows along the swale, around the house, and out toward the street or roadside ditch (see Figure 3 on p. 13).
Consider drainage in the initial planning stage to remove rain and snowmelt from the site, and give consideration to the location of the house on a property, its elevation relative to the site and utilities. Establish a surface drainage pattern that will drain the entire lot and direct water away from the house (see Figure 3 on p. 13). Driveways and walkways should help drainage, not interfere with it. If a house uses well water, all surface drainage must be directed away from the well to avoid contaminating the water supply.
DRIVEWAYS A driveway should be at least 2.4 m (8 ft.) wide and 3 m (10 ft.) wide when it also serves as a walkway. It should have a slope suitable for traction in winter conditions, provide good visibility at the street intersection and be
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