In urban drainage systems, it is usually necessary to split the stormwater discharge among different sewer branches because of limited flow capacity of either hydraulic structures or sewer lines. For this purpose sewer sideweirs and leaping weirs are generally used as diversion overflow structures. For supercritical approach flow the former is not recommended because of the occurrence of hydraulic jumps, while the latter requires an outlet located below the approach flow sewer bottom. To overcome these constraints a novel compact hydraulic structure is proposed. It consists of a frontal rectangular intake, representing the diversion sewer inlet, located in the approach flow sewer and parallel to its bottom. A 6.67:1 scale model was tested over a range of hydraulic and geometrical parameters to determine its head-discharge relationship, developing a dimensionless equation relating the diversion discharge to the geometrical properties of the intake under supercritical flow conditions. The limited hydraulic structure size provides cost-effectiveness as well as ease of installation and maintenance.
Novel diversion structure for supercritical flow / DEL GIUDICE, Giuseppe; Padulano, Roberta; Carravetta, Armando. - In: JOURNAL OF HYDRAULIC ENGINEERING. - ISSN 0733-9429. - 139:1(2013), pp. 84-87. [10.1061/(ASCE)HY.1943-7900.0000660]
Novel diversion structure for supercritical flow
DEL GIUDICE, GIUSEPPE;PADULANO, ROBERTA;CARRAVETTA, ARMANDO
2013
Abstract
In urban drainage systems, it is usually necessary to split the stormwater discharge among different sewer branches because of limited flow capacity of either hydraulic structures or sewer lines. For this purpose sewer sideweirs and leaping weirs are generally used as diversion overflow structures. For supercritical approach flow the former is not recommended because of the occurrence of hydraulic jumps, while the latter requires an outlet located below the approach flow sewer bottom. To overcome these constraints a novel compact hydraulic structure is proposed. It consists of a frontal rectangular intake, representing the diversion sewer inlet, located in the approach flow sewer and parallel to its bottom. A 6.67:1 scale model was tested over a range of hydraulic and geometrical parameters to determine its head-discharge relationship, developing a dimensionless equation relating the diversion discharge to the geometrical properties of the intake under supercritical flow conditions. The limited hydraulic structure size provides cost-effectiveness as well as ease of installation and maintenance.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.