Abstract
To determine the effectiveness of the retention capacity utilization of traditional and innovative drainage systems equipped with damming partitions, the detailed model tests were carried out. The research results allowed indicating what values of the hydraulic parameter of the innovative drainage system should be adopted in order to effectively use the retention capacity of drainage collectors. The adoption of short distances between the LKR damming partitions and a high level of permissible rainfall of stormwater Hper turned out to be the most effective solution. In the most favorable conditions, the peak flow was reduced by up to 60% (717.46 dm3/s) compared to the values established in the traditional drainage system (1807.62 dm3/s). The benefits obtained resulted from the increased retention efficiency of the drainage system after equipping it with the damming partitions. It was found that the innovative system always achieved the maximum retention capacity with longer rainfall compared to the traditional system. In the real catchment area, an increase in the use of the retention capacity of the drainage system, from an initial value of 65% for a traditional system to almost 88% for an innovative system, was also found. Very large variability of the volume of accumulated stormwater in the conduits of the traditional and innovative drainage system was observed during rainfall, which generated the peak rainfall discharge in the innovative system. With rainfall of TRK duration, the innovative system accumulated up to 746.50 m3 more stormwater compared to a traditional system, which was 49.2% of the total retention capacity of the drainage system, with a value of 1515.76 m3. The approach to reduce the growing flood risk in cities provided the right approach to long-term urban drainage system planning, especially since traditional drainage systems are still the leading way to transport stormwater in cities. In addition, the innovative sewage system gives the possibility of favorable cooperation with any objects (LID) and retention tanks with any hydraulic model. The implementation of an innovative system allows achieving significant financial savings and reducing the need to reserve areas designated for infrastructure investments.
Highlights
Due to the increasing concentration of greenhouse gases in the atmosphere, climate changes cause significant transformations in the characteristics of extreme weather phenomena [1,2] manifested by an increase in the incidence of short-term torrential rainfall [3,4]
The impact of the damming partitions was determined on the volume of QD stormwater discharges during rainfall with different durations (Figure 4). It was done by turning the traditional drainage system into a retention canal system that creates an innovative drainage system
LKR damming partitions affects equipped with a retention canal system the validity of each of the concept of hydraulicdecrease transport of and stormwater in an innovative drainage system in order to the successive the QD,IDS,Caccumulation parameter values for all permissible system fillings specified by determine the optimal solution in the given design conditions
Summary
Due to the increasing concentration of greenhouse gases in the atmosphere, climate changes cause significant transformations in the characteristics of extreme weather phenomena [1,2] manifested by an increase in the incidence of short-term torrential rainfall [3,4]. The use of the retention capacity of gravitational drainage systems is possible by introducing the devices into the wells and sewer chambers that enable the accumulation of transported stormwater in pipes [70] Such a practice of stormwater management allows reducing significantly the risk of urban floods, while limiting the expenditure on investments and the required area for building cubature objects of the drainage systems. The use of the retention capacity of the undoubtedly part of the policy of sustainable stormwater management, bringing many benefits to the environment, operators of drainage systems and people living in drained areas This method of stormwater management allows social losses, of which can manifest in the drainage system in global terms. Case Study urban catchment area, which is located in Southeastern Poland (Figure 1)
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