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5.1.1. Rules for Planning the Site
Wastewater recycling facilities each have major variations according to the site, but some rules always apply:
- Know the pathway and elevation where the collection system enters the site, including soil conditions underneath planned piping. Failure to account for this leads to disaster. If marshy or rocky conditions prevail where piping is planned, this may double construction cost and force realignment of elevations, causing water flow changes.
- Avoid using pumps if possible - use gravity flow.
- Use clay or compacted impermeable soil if possible
- Know local agriculture and aquaculture before designing
- Machine access: Each major component on the facility must be accessible by a back-digger or pump truck for servicing or modifications.
5.1.2. Mapping the site
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Five maps are required:
Location
Area
Site
Concept
Working drawings
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The Location map shows the region where the site is located on a municipal road map, including compass.
The Area map shows an overhead projection of the local area served by the facility including:
- compass
- the surrounding neighborhood,
- the site,
- general patterns of collection system and rivers,
- where wastewater goes after it leaves the facility.
The Site Map shows an overhead projection of:
- existing trees
- existing collection system
- existing elevations
- existing structures on the site
- location of soil test drill holes
- groundwater sources
- legal boundaries
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The Concept Drawings show overhead projection of:
- planned slope also with a cutaway side view
- planned ponds, with a cutaway side view
- planned collection system on the site
- planned site structures
- biogas digester if planned
- planned locations for livestock
- planned flow pattern of water
- planned garden areas
- legal boundaries
- fence
The Working Drawings show:
- detailed structural plans for structures on site.
- detailed structural plan of biogas digester
- pond gate construction
- garden irrigation system
Concept and working drawings are done after site selection. It is unnecessary to have detailed engineering for most working drawings unless required by local law except for the biodigester. This requires a separate set of drawings.
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Wastewater Recycling in Tropical Regions
©Copyright 1998-2008 Aquasol International Ltd., Hamburger Umweltinstitut e.V. & O Instituto Ambiental
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