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Własności fizyczne i przesiąkliwość płyty boiska Wisły Kraków SA po renowacji

100%

Rajda W. , Żarnowiec W. , Stachura T.

tom Vol. 20, No. 2

153--159

W pracy zbadano wodoprzepuszczalność i niektóre własności fizyczne płyty boiska piłkarskiego na stadionie WISŁY KRAKÓW S.A. po renowacji wykonanej w 2002 roku. Przesiąkliwość, uziarnienie, gęstość właściwą, gęstość objętościową i porowatość gruntu pobranego z płyty oznaczono metodami standardowymi. Wykazano, że na skutek użycia nieodpowiedniego materiału wystąpiły istotne różnice własności, zwłaszcza uziarnienia i wodoprzepuszczalności w stosunku wymagań normy DIN 18 035, powodujące stagnowanie wody na powierzchni boiska.

The paper investigated the water permeability and some physical properties of the football field Wisła Kraków after the renovation done in 2002. Permeability, grain size, specific density, volume density and porosity of the soil taken from the plates was determined by standard methods. It was shown that as a result of improper use of the material were significant differences in properties, particularly grains size and water permeability compared with DIN 18 035, causing local puddles of water on the surface of the pitch.

Rainwater Management in Protected Areas

75%

Żarnowiec W. , Bogdał A. , Kowalik T. , Kanownik W. , Ostrowski K. , Rajda W.

tom Vol. 18, nr 2

69--77

The aim of the study was to find out whether the climate of southern Poland allows for removing rainwater from industrial areas by evaporation from roof surfaces. The study covered the premises of a Logistics Centre with an approximate area of 34 hectares, located in the catchment of the Wedonka stream and in the region of water intake for Kraków at the Rudawa river. In the future, the Centre will comprise nine large warehouses. Road traffic associated with the project will cause potential risks for groundwater and surface water of this protected area. Therefore, the Centre’s investor decided to evaporate rainwater from the premises. To establish advisability of this plan, the study team designed and built a unique experimental station consisting of experimental roof, a tank for collecting water for the sprinkler system, system for delivering, distributing and discharging water from the roof, measuring tilt tray, automatic meteorological station, and electronic devices for recording measurement data. The research on the experimental station was carried out from April to October in 2011 and 2012 and included continuous measurements of the volume of water supplied to and discharged from the roof. Moreover, the temperature of the roof and water in the tank and the number of important meteorological parameters were measured. The difference between supplied and discharged water, divided by the wetted surface of the roof, helped to determine thickness of the evaporation layer in millimeters. The study confirmed the possibility of removing potentially contaminated rainwater by evaporating it from roof surfaces of the Logistics Centre located near Kraków at an average rate of 5.9 dm3·m–2·d–1. However, due to high seasonal variability of rainfall and air temperature, it is necessary to temporarily collect water in an expansion tank of suitable capacity.