Worksheets6035 - Drainage Outcome 4 part 2
Total questions: 20
Worksheet time: 10mins
What are the two important factors to consider with the roof area in rainwater systems?
The color of the roof and the material of the roof
The actual size of the roof area and the angle of the roof area
The height of the building and the number of windows
The type of gutters and the number of downspouts
Which of the following is NOT a factor to consider with the roof area in rainwater systems?
The actual size of the roof area
The angle of the roof area
The color of the roof
The slope of the roof
Which two factors will affect the amount of rainwater collected and the velocity at which the water enters the guttering?
Roof area and wind speed
Roof area and slope
Roof area and rainfall intensity
Roof area and temperature
What is the primary function of a running outlet in a rainwater system?
To connect the gutter and the downpipe
To store rainwater
To filter rainwater
To heat rainwater
How is a running outlet designed to cope with water flow?
With water flowing from one direction
With water flowing from two directions
By storing excess water
By evaporating excess water
What determines the position of the running outlet in a rainwater system?
The size of the property
The location of the drains of the property
The amount of rainfall
The type of gutter used
What is the effect of having more outlets on a rainwater system?
Rainwater travels a longer distance in the gutter
Rainwater travels a shorter distance in the gutter
The system becomes less efficient
The system becomes more expensive
What should you always check to find out the flow capacity of a running outlet design?
The roof area
The manufacturer's data sheet
The expected flow rate
The technical literature
How can you determine the number of outlets a roof line may require?
By checking the roof area
By dividing the expected flow rate of the roof area by the flow rate for the outlet
By consulting the manufacturer's data sheet
By estimating the roof size
According to BS EN 12056, what is the recommended fall for gutters per metre length?
0-1mm
1-3mm
3-5mm
5-7mm
What should the gradient of the eaves gutter prevent?
Allowing rainwater to pool on the roof
Allowing rainwater to run off the roof and miss the gutter
Allowing rainwater to flow too quickly
Allowing debris to accumulate in the gutter
What is the standard fall ratio for gutters as interpreted by most manufacturers?
1:600
1:500
1:700
1:800
How much drop is there for every 600mm length in the standard fall ratio for gutters?
1mm
2mm
3mm
4mm
What is the equivalent drop in 15 meters for the standard fall ratio of gutters?
25mm
20mm
30mm
35mm
Why is the accepted ratio of 1:600 important in gutter systems?
It allows efficient flow of rainwater and keeps the gutter relatively silt free.
It reduces the cost of installation.
It increases the aesthetic appeal of the building.
It makes the gutter system more durable.
Where are modern gutter systems with little or no fall more commonly used?
Large, commercial roof lines
Residential homes
Small sheds
Greenhouses
What is the effect of changes in direction in a gutter system?
They increase the efficiency of water flow.
They do not affect the efficiency of water flow.
They decrease the efficiency of water flow.
They have no impact on the gutter system.
Which of the following should be avoided in a gutter system?
Installing an outlet far from a change in direction.
Having too many changes in direction without an outlet.
Using straight runs.
Reducing the fall ratio.
What gives the maximum flow rate in a gutter system?
Curved runs.
Straight runs.
Multiple changes in direction.
Installing outlets close to changes in direction.
What should be done if a lot of changes in direction are unavoidable in a gutter system?
Increase the fall ratio.
Install more outlets.
Reduce the fall ratio.
Use curved runs.
