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New mobile watercourse protection facility launched!
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Dimensioning of watercource protection facilities is a sophisticated challenge,
requiring in-depth knowledge of local structural conditions and understanding of
complex correlations.
Watercource protection facilities are to be planned and dimensioned based on the
space available, criteria of discharge and information on geology and tunnelling.
Knowing all relevant data allows for making up a concept of an optimised watercource
facility and planning the implementation in detail.
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All concepts of watercourse protection facilites by SEIBOLD-Messtechnik are based on
the standards of SIA (Swiss Engineer- and Architect Association,
www.sia.ch)
and experiences, that SEIBOLD-Messtechnik was able to get from 50 projects in the
past years.
Still the biggest challenge of dimensioning watercourse protection facilities is the
uncertainty of the inflow to be expected. A watercourse protection facility will
neither work satisfactorily in case of under-, nor oversizing. A simple method for
increasing the flexibility of the quantity of inflow to be expected is having three
settling ponds available whereof two are fed continously as a rule.
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In various tenders settling times of up to 90 minutes are suggested. From our
standard of knowledge, this maximum value is taken from general terms of reference
of sewage tratment plants, that typically consider and respectively do not consider
parameters that might cause problems in other environmental conditions. Sewage
treatment plants usually do not face limitations of the amount of space available,
further deconstruction at the end of the construction period usually is not an issue
but has to be taken into consideration in other types of applications, e.g.
tunneling projects.
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SEIBOLD-Messtechnik calculates the dimensions required based on the guidelines of
SIA. According to SIA Standard 431, as a rule of thumb for 20 minutes of residence
time within the settling pond one can assume:
volume required for discharge (m3) = inflow (l/s) + 20%
surface required** (m2) ~ inflow (l/s) x 2 **for discharging into a river
In general, coarse solids can settle in a short period of time, but airborne
particles (especially for clay or silt with grain size of 0.004 to 0.063 mm
according to Wentworth) cause problems to be coped by the use of flocculants. The
use of flocculants improves settlement by agglutination of solids of smallest size
by a factor three to five.
The concept for an ideal watercourse protection facility by SEIBOLD-Messtechnik
comprises equipment for dosing flocculants, for matching all criteria of discharge
of filterable and suspended solids even with unfavourable sloshing conditions.
Another requirement of an optimised watercourse protection facility is to avoid pumps
within the facility. As a consequence, ground basins and containers should not be
mixed within a watercourse protection facility. Having settling ponds available as
ground basis, neutralisation should be provided by the use of concrete rings.
Further, concrete rings should be located beneath the level of the settling pond for
providing discharge and neutralisation without current supply, too.
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SEIBOLD-Messtechnik und Projektentwicklug GmbH,
A-1110 Wien, Grillgasse 51
Tel +43 1 332 00 60, Fax +43 1 332 00 60 44,
office@seiboldme.com
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