(ii)
Downspout
Figure 4.6.1.3: Types of downspout
Figure: 4.6.1.4: Details of downspout
Source: http://www.marc.org/Environment/Water-Resources/images/standpipe.aspx
Rainwater downspouts play an important role in drainage system. Downspouts are drainage pipes that direct rainwater from the roof to the ground. This is where the rainwater is lead away from the buildings foundation. Downspouts are most commonly seen attached to the corner of building. Without perfectly working downspouts, rainwater will fall off the roof edge and may cause flooding and damage to the building. The problem with downspouts is that they clog very easily when leaves, twigs, and other debris accumulate within the downspout itself. This makes it difficult for the rainwater to drain properly throughout the downspout. Downspouts are mostly attached to the house by downspout brackets, which can be easily removed for further cleaning if the downspout becomes highly clogged with debris.
UBBL 84. (a) Suitable measure shall be taken to prevent the penetration of dampness and moisture into a building. (b) Damp proof courses where provide shall comply with BS 743 (materials for horizontal D.P.C)
81