The presence of a first flush (FF) of suspended solids (SS) in stormwater runoff has important implications for the design of treatment facilities, as does the particle size of solids. Whilst numerous studies have examined the FF behaviour of SS, few have disaggregated FF trends by particle size. In this study, the FF behaviour of SS was investigated in five size ranges, sampled from an urban stormwater drainage system located in Dublin, Ireland. A weak FF was exhibited in the gross fraction of SS, with just two events from 14 transporting more than 50% of the SS mass in the first 25% of runoff, implying that treatment structures should be capable of removing SS throughout the storm event. In the majority of rain events, the FF strength increased with decreasing particle size, probably related to the lower intensities required to dislodge solids at the onset of rainfall. Although FF strength was correlated with rain event characteristics, prediction intervals were too broad to confirm FF presence based on rainfall data alone. Therefore, the design of smaller treatment volumes based on an assumption of FF must be justified by local monitoring data.
Emergency Stormwater Pumping Station
Two electric drive 8 inch pumps - BBA model BA180E D328 - are installed at a stormwater pumping station in Spartanburg, SC. The requirements were 5,500 GPM @65 Feet TDH and fully auto controlled with soft start and VFD. No risk with all components installed safe and dry in the durable sound attenuated BBA canopy.
Should I Sweep My Parking Lot When It Rains?
Rain can put a damper on many of your activities. But during the rainy season, a lot of people make the mistake of canceling their regular sweeping services, and this does more harm than good, not only for your parking lot but also the environment. Parking lots are covered with waste, whether you see it or not. There is a lot of chemical waste on your parking lot too. Oil, fuel, grease, metals and other chemicals. And when it rains, this waste is washed away by rainwater down the storm drain and into the...
Stormwater Channel Embankment Protection - Case study
City`s Relocation and Floodplain Management Project Included Embankment Protection at Culvert OutflowsAppteton, Wisconsin -- The GEORUNNER flow protection mats, manufactured by local Appleton company, Presto Geosystems, was employed as additional embankment stability on the channel alignment project.The Apple Creek Relocation and Floodplain Management Project includes re-aligning approximately 5,000 feet of channel, creation of wetland depressional areas and a floodplain storage area, and the placement of three...
Austin Plan Grants Drainage Charge Discounts for Watershed Protection
Texas capital joins other areas of Southwest in dealing with alternating droughts and flooding In Texas, which experiences alternating droughts and deluges, water management issues have always been vitally important. The City of Austin Watershed Protection Department, influenced by a susceptibility to flash flooding and a time-honored tradition of stormwater storage in cisterns, is now offering drainage charge discounts to users of green stormwater infrastructure (GSI) features, which can include green roofs,...
Urban stormwater inundation simulation based on SWMM and diffusive overland-flow model
With rapid urbanization, inundation-induced property losses have become more and more severe. Urban inundation modeling is an effective way to reduce these losses. This paper introduces a simplified urban stormwater inundation simulation model based on the United States Environmental Protection Agency Storm Water Management Model (SWMM) and a geographic information system (GIS)-based diffusive overland-flow model. SWMM is applied for computation of flows in storm sewer systems and flooding flows at junctions,...