storm drain

Functions of Storm Water Pits and Drains

June 23, 2015

Stormwater quantity is important when discussing stormwater management, systems, structures, and flow. Equally important is the water quality that flows through the systems and devices.

Stormwater pits are water collector or storage structures or areas. Stormwater pits are not intended to hold water runoff for extended times. But the structure or area must be large enough to contain water runoff long enough to dissipate through drain pipes at a rate that maintains the flow.

Storm drains on the other hand are used to manage the quantity of rain that runs off roofs, parking lots, and sidewalks, and via stormwater pits. Storm drains and pipes channel the flow away from inhabited built-up areas to streams and rivers.

Stormwater Pits

Stormwater pits are used for:

  • stormwater drainage,
  • stormwater pit applications,
  • connection by pipe to larger pipe inlets,
  • roadway drainage structures,
  • parking lot drainage structures, and
  • junction pits (grated inlets and curb and gutter drainage).

A stormwater pit and drainage system involves more than digging a hole, setting a structure, or laying and connecting drain pipe. For a stormwater pit to be effectively functional, it must be engineered to the correct size (capacity), with an appropriate filtration system to prevent the backups or malfunctioning. The pit should be constructed from material which is suitable for its use (i.e.: residential stormwater pits made from recycled plastic)..

Pits and filtration components may be:

  • Plastic-based light-duty pits (for rainwater);
  • Polypropylene-based heavy-duty pits (varying sizes specifically for stormwater);
  • Plastic / aluminum top filter lids, or
  • Filtering units such as leaf guards, oil separators, and other devices.

Pit systems may be modular, precast, or custom, with incremental riser sections, cover, lids, and grates.

Modular units allow quick installation with preformed knockouts that can accommodate a variety of pipe orientations and sizes. They are suitable for junction and curb inlet pits, and grated inlets in standard sizes.

Precast stormwater pit units are also manufactured to accommodate a range of drain pipe sizes. Precast pits are typically available in standard sizes.

Riser sections are available for quick construction and covers may be concrete, steel grates, or inlets.

Stormwater Drains

Excess groundwater, water runoff from roadways, parking lots, and walks, and rain water from roofs and gutters are channeled into stormwater drains. The stormwater in turn drains, untreated, into rivers, streams, ponds, and dry wells. Structures and piping (with filtration components and grates) separate contaminants before the runoff continues to its outlet.

Storm drain systems may be small residential or large municipal systems that allow the flow of water runoff away from developed areas. Stormwater drain components include:

  • Inlets (side inlets adjacent to the curb),
  • Grated inlets (grated to keep out litter, sediment, contaminants),
  • Catch basins (heavier sediment settles in catch basin sumps)
  • Piping (come in various sizes, materials, shapes, and have not treatment facilities), and
  • Outlets (water discharge points into individual dry wells, retention ponds, river, stream, canal, etc.).

Stormwater pit and components should be installed by a licensed (gutter) installer or plumber to ensure the appropriate system is installed to suit the particular climate it will serve, the pit is in compliance with all requirements and regulations, and the overall manufactured quality of the system is assured.

Apex Vacuum Gutter Cleaning
Diamond Creek, Victoria, 3089

Alasdair Collis
Ph: 0410 614 924
Fax: 03 9438 2743

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