Performance Of Stormwater Detention Tanks In
An Experimental Catchment Of Northern Italy
Author(s)
S. Todeschini & S. Papiri
Abstract
The performance of stormwater detention tanks with alternative design
configurations and operating conditions have been evaluated according to an
integrated approach. Various performance indices have been adopted to describe
the mitigation of the pollution impact to the natural environment, the reduction
of the management and maintenance charges for the urban drainage system, the
preservation of the normal purification efficiency, and the limitation of the costs
at the treatment plant. A conceptual model based on the instantaneous unit
hydrograph of a single linear reservoir system has been used to simulate the
rainfall-runoff process and the pollutant dynamics on an experimental urban
catchment and combined sewer network for a continuous run of events and inter
event periods of one year. Stormwater detention tank combined with flow
regulator demonstrates good performance with respect to environmental
pollution: satisfactory performance indicators can be obtained with fairly low
flow rate of flow regulator (1 L/s per hectare of impervious area) and tank
volume of about 35-50 m3 per impervious hectare. These solutions also ensure
rather low number and duration of overflows. Intermittent emptying controls the
volume sent for purification thus reducing the costs and the risks of impairment
in the normal treatment efficiency of the plant. Dangerous anaerobic conditions
can be avoided also for a considerable volume of the tank (i.e. 75 m3/haimp) while
adopting rather high emptying flow rate of the tank (i.e. 1-2 L/s/haimp).
Keywords: urban catchment, stormwater pollution, flow regulator, stormwater
detention tank, numerical modelling.
Keywords
urban catchment, stormwater pollution, flow regulator, stormwater
detention tank, numerical modelling.
Related Book
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