Drainage plan: soakwells, subsoil drains and surface falls
On the Swan Coastal Plain stormwater is disposed of on site by infiltration. Size the soakwells for your impervious area, place them legally, and plan the subsoil drainage for any area that will hold water.
Not planted yet — but the plan for it is final
The practical task and the checklist below are exactly what this lesson will teach. What is missing is the written explanation and the curated links, each one fetched and verified before it ships.
In the meantime the checklist is genuinely usable on its own. Take it outside.
Do this on your own block
Field journal entry
Drainage plan
Calculate the required soakwell volume for all new impervious area, mark soakwell positions with their distances from buildings and boundaries, show all connecting pipework with falls, and mark subsoil drains and their outlets.
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Checklist
- Impervious area measured and soakwell volume calculated to your council's rule
- Soakwell locations respect setbacks from buildings and boundaries
- All pipework has a stated fall
- No stormwater discharges onto a neighbour or the street illegally