TGD H 2010 – 1.5.4 – SURFACE WATER DRAINAGE, Eaves drop systems

1.5.4 Eaves drop systems Eaves drop systems allow rainwater from roofs to drop freely to the ground. Where these are used, they should be designed: – (a) to protect the fabric of the building from ingress of water, caused by water splashing on the external walls; (b) to prevent water from entering doorways and windows; (c) to protect persons using doorways etc. from falling water; (d) to protect persons and the fabric of the building from rainwater as it hits the ground by splashing, for example by provision of a gravel layer or angled concrete apron deflecting the water away from the building; (e) to protect the foundations from concentrated discharges such as those from valleys or valley gutters or from excessive flows due to large roofs (i.e. where the area of roof per unit length is high); (f) to protect against discharge of water onto neighbouring properties or buildings.

C:BCARTGDTGD hTGD%20H%202010TGD%20H%202010%20-%20SECTION%201%201.5.4.pdf