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Thursday, August 30, 2012

A bit of information about Talismondé's Sewer System

Talismondé has a main drain called the Gorgon’s Throat that is 12 ft by 18 ft and is made from hewn stone. It starts well past the southern gate of the city and into the fields (under the main road) and extends north until it dumps into the Misty Sea. The conduct’s main purpose is to control city drainage, storm runoff and sewage. Drainage systems are located in the streets (masonry: rectangular x-sections). At the ends of the drain are woven metal “bar screens’. Liquids enter into brick lined cesspools and then descending through a series of soak-pits to the Gorgon’s Throat. Most drops are “free fall” masonry shafts into soak-pits or cesspools. Flush tanks are strategically set at points so to capture and then use the addition of sewage, rain water or other fluids to build velocity for the whole system. Others are closed top cement channels to move storm water, sewage and other wastes. Wet detention ponds collect rain water and overflow from levees and catch basins near the Misty Sea and are used to gravity power the (sump) pumps that run many fountains not to mention the vertical screw pumps that run the main system below ground. The tide changes of the Misty Sea are used to flush the main sewer lines.

During the resettlement after the Nexus Wars, the governor raised the level of the entire area by 20 to 30 feet so provide for the gravity fed pumps. Since much of what is Talismondé was built on old ruins, this was easily done but done by collapsing and building upon the older structures. This created a maze of vertical and horizontal pipes that amply take care of city’s requirements. It also caused some problems unforeseen when it was initiated. Shortly after its creation, several areas dropped in height causing multiple blockages in the system. Re-routing and designing the system fixed most of these problems as did the engineering of better placed sump pumps, access points and outlets to release gas, solid blockages and excess fluid.

Oval or egg shaped sewers predominate below with underground weirs and dams that hold, collect and filter waste water. Some areas (usually with underground waterfalls) have Weeping Tiles/Pipes above that help build the velocity of the system. Manholes are placed at periodic intervals to allow for ventilation and access. Most descent into manholes is made by a ladder or rope; however, some have steps built into the manhole structure, sometimes via protruding bricks or stones, or wrought iron/cast-iron steps.

2 comments:

  1. Can water in the sewage system be recycled and turn into reusable water supply? I came across a house that they installed a water filter system at home to filter contaminants from their water supplier. any thoughts on this matter?

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  2. It could be. The original Talismonde city system was not constructed for that capability but it could be modified to do so.

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