Surface inlet pits must be fitted with a suitable grate to prevent litter entering the underground drainage system and causing blockages. The runoff collection system must collect runoff from all pervious and impervious areas and direct it to the runoff storage system. an outlet structure to control the rate of stormwater discharge from the runoff storage system to the Council drainage networkĮach element is discussed further below.a runoff collection system consisting of gutters, downpipes, pits and pipes.The key elements of an On-Site Stormwater Detention (OSD) system are: You can read below or download the OSD design guidelines as a PDF. Water coming from a neighbouring property.Places of Public Entertainment (POPE) and Temporary Structures.Find the legal point of stormwater discharge.Enquire about neighbourhood building works.Request a property information certificate.Expand menu Collapse menu Request copies of building plans and permits.Other structures and permit requirements.Expand menu Collapse menu Applying for a building permit.Apply for asset protection final inspection.Apply for adjoining land owner details - protection works.
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