Roadside gully pots act as a link between surface runoff and drainage system, therefore they have to be considered as a relevant part and parcel of urban drainage systems. It is a well-established opinion that their main function is to protect downstream drainage facilities, treatment plants as well as receiving waters from excessive sediment loads. Anyway a continuous supply of solids to a device supposed to trap them, leads unavoidably to gradual silting and eventually to clogging problems. These factors appear quite relevant in Italian cities, mainly served by combined sewer systems where trapped gullies are required to prevent the escape of bad odour, being then particularly subject to silting and clogging problems. This study has therefore the objective to determine which variables influence the gully pot capability of retaining solids (efficiency). Several laboratory tests have been performed on a simple plastic gully pot (40 x 40 cm), varying the characteristics of the rainfall events (inflow rate) and of the influent solids (diameter, particle size distribution and specific gravity). Results obtained don’t seem to contradict previous research, but usefully extend their substantial validity also to contexts and conditions for which they had not been directly verified.
Bolognesi A., Casadio A., Ciccarello A., Maglionico M., Artina S. (2008). Experimental study of roadside gully pots efficiency in trapping solids washed off during rainfall events. s.l : s.n.
Experimental study of roadside gully pots efficiency in trapping solids washed off during rainfall events
BOLOGNESI, ANDREA;CASADIO, ANDREA;CICCARELLO, ANNALISA;MAGLIONICO, MARCO;ARTINA, SANDRO
2008
Abstract
Roadside gully pots act as a link between surface runoff and drainage system, therefore they have to be considered as a relevant part and parcel of urban drainage systems. It is a well-established opinion that their main function is to protect downstream drainage facilities, treatment plants as well as receiving waters from excessive sediment loads. Anyway a continuous supply of solids to a device supposed to trap them, leads unavoidably to gradual silting and eventually to clogging problems. These factors appear quite relevant in Italian cities, mainly served by combined sewer systems where trapped gullies are required to prevent the escape of bad odour, being then particularly subject to silting and clogging problems. This study has therefore the objective to determine which variables influence the gully pot capability of retaining solids (efficiency). Several laboratory tests have been performed on a simple plastic gully pot (40 x 40 cm), varying the characteristics of the rainfall events (inflow rate) and of the influent solids (diameter, particle size distribution and specific gravity). Results obtained don’t seem to contradict previous research, but usefully extend their substantial validity also to contexts and conditions for which they had not been directly verified.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
