Patent ID: 8858119

Claim:
A liquid run-off disposal system comprising: an elongate tank structure having one or more sections adapted to be arranged end to end in a substantially horizontal orientation below ground, each section of the tank structure taking the form of a culvert section of generally rectangular cross-section having first and second substantially vertically oriented side walls; in cross-sectional view the first and second side walls each include an inner surface and an outer surface, and the first and second side walls each have a substantially constant thickness measured between the respective inner surface and outer surface; the first and second constant thickness side walls each include a plurality of apertures provided therein, each of the apertures being louvre-shaped and in cross-sectional view each aperture includes an upper surface and a lower surface which are substantially parallel to each other and are angled downwards from the inner surface to the outer surface, and for each aperture the distance between the upper surface and the lower surface at the outer surface is the same so that each of the apertures have substantially the same height at the outer surface, and the upper and lower surfaces are angled at such an angle and are of a length so as to substantially overlap in a horizontal direction, and for each aperture between one quarter to one half of the length of the respective upper and lower surfaces overlap measured in a vertical direction so as to admit the exit of water but substantially inhibit the entry of soil wherein, in use, when liquid run-off is piped into the tank structure it can drain away by passing through the apertures and soaking into the surrounding soil.