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ainwater storage tanks
serve both for the storage and the cleaning of the rainwater. The
amount of cleaning is thereby directly dependent upon the flow of
the water in the storage vessel (inlet, overflow, suction). This
applies both to storage vessels inside as well as outside.
equirements for rainwater
storage:
- Measurement of volume according to roof area (not too large!,
approx. 265 gal per 82 - 151 sq. feet of roof area)
- Fulfilling the requirements of the building standards (ensuring
the drainage of the building)
- Permanently water-tight and must have protection against light,
storage temperature permanently below 18°C (64°F), frost
protection
- Stability of shape, secured against settlement cracks and buoyancy,
durability
- Neutralized against acid rain, good oxygen distribution in the
water
- Calm inlet of rainwater and potable water. Calm suction (for
permanent sedimentation of all materials heavier than water)
- Automatic removal of all materials that are lighter than water
and float (storage not too large, correctly constructed overflow)
- Providing a sufficiently large overflow against other water
or backpressure, and animals;
- Sealing covers and walls against foreign particles, other water,
and animals
- Good accessibility, simple cleaning without extra costs, low
maintenance
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Requirements for rainwater storage will be best fulfilled,
in practice, by a one-piece concrete, polyprophylene, or fiberglass
cistern. Cisterns in the earth are basically preferable to cellar
tanks or above ground.
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