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DESIGN GUIDANCE. SITE CONSIDERATIONS Infiltration chambers are another design variation on soakaways. They in- clude a range of pipe that is at the top of the gravel layer and is connected to a storm sewer. Outlet pipes must have Mar 15, 2015 This Standard gives design guidance on how soakaways shall be .. than coarser sands and gravels due to increased surface area and hence trench soakaways are cheaper to dig with readily available . used in the soakaway design are calculated by .. quality of information and guidance when it. A guide to soakaways, their design and construction. is empty, not filled with old bricks, lumps of concrete or gravel, etc., as is often found in older soakaways. Soakaway Design Guide - Guidance for all aspects of Soakaway Design from the proposed soakaway, and the surrounding soils are pervious such as gravel, Rainwater soakaway design guidance for disposal of surface water from buildings. facility design options to consider, such as soakaways, infiltration trenches and . Proximity to Underground Utilities: Local utility design guidance should be . can be a pipe that is at or near the top of the gravel layer and is connected to aGravel filled reinstatements adjacent to drain runs over solution features in chalk This Soakaway Design Guide has been issued in July 2000 generally to *NOTE: For individual house soakaways, only the items in italics are required. . Design procedures: Hydraulic. 2.3. Soil Type Typical Infiltration rate. Gravel.