Storm drainage systems

Abstract

A storm drainage system and a device for use in the system for restricting the rate at which water drains from an eavestrough is disclosed hereinafter. The storm drainage system includes a plurality of pitched roofed structures, a sewer service connection associated with each structure, a municipal sewer drainage system in direct fluid communication with the sewer service connection, an eavestrough system associated with each pitched roofed structure for collecting runoff therefrom and at least one downspout associated with each eavestrough system. The downspout has a through passage for conveying runoff water from its associated eavestrough to the sewer service connection. A flow restricting device is located in the through passage for restricting the flow of water through the through passage to a flow which is substantially less than the unrestricted flow capacity of the downspout whereby the rate at which water is conveyed to the municipal sewer drainage system in storm conditions is limited to that which the sewer drainage system can accommodate from each pitched roofed structure. The flow restricting device includes a cover proportioned to fit within the eavestrough and adapted to be mounted in a position overlying the input end of the downspout. A drainage passage opens through the cover to permit water to pass therethrough. The drainage passage is proportioned to permit a restricted flow of water from the eavestrough to the downspout in use thereby to achieve the required flow restriction.

Dependencies are inferred from the claim text.