Hydraulics of Bottom Rack Intake

Brunella, Sandro; Hager, Willi H.; Minor, Hans-Erwin

doi:10.1061/(asce)0733-9429(2003)129:1(2)

Cited by 46 publications

(68 citation statements)

References 5 publications

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“…Circular bars [12] Prismatic rounded bars [8] Prismatic rounded bars [9] T-shaped bars [4] T-shaped bars [1,2] Adjustment circular bars Adjustment prismatic rounded bars Ajustment T-shaped bars Previous adjustments proposed for the static discharge coefficient [3,4] are presented in the following equations:…”

Section: Q0mentioning

confidence: 99%

“…Viscosity influence, tanθ = 30%, 33% [12] proposed an expression to calculate the critical Reynolds number in bottom intake systems. Those authors estimated that there are no scaling effects when this value is bigger than 250,000, which corresponds with specific flows greater than 75 l/s/m in the laboratory model used.…”

Section: Flow Depth Vs Incoming Flowmentioning

confidence: 99%

“…Those studies have void ratios (spacing between bars divided by the total area) from 0.095 to 0.66, and incoming flows from 0.05 to 0.20 m 3 /s/m. Different bar shapes have been considered: works of Noseda [1,2] Castillo et al [3], Castillo et al [4], García [5,6] and Carrillo et al [7] used T-shaped flat bars; Garot [8], Righetti et al [9], Ghosh and Ahmad [10] and Kumar et al [11] analyzed prismatic rounded and flat bars; Brunella et al [12], Vargas [13] and Subramanya [14] presented results with circular bars; Orth et al [15] and White et al [16] experimented with hydrodynamic bars; and Nakagawa [17] and Bina [18] used mesh-panel bottom racks. At prototype scale, Drobir [19] presented the only existing measurements of wetted rack Empirical formulas are based on experimental measurements.…”

Section: Introductionmentioning

confidence: 99%

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Empirical, Dimensional and Inspectional Analysis in the Design of Bottom Intake Racks

García

Castillo

Carrillo

et al. 2018

Water

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Flow over bottom racks is highly turbulent, three-dimensional and spatially varied. The design of bottom intake systems has mainly been studied in the laboratory. The comparison of existing experimental studies shows large deviations in the definition of design parameters such as wetted rack length. Each experimental study is limited to a single bar type or to a low range of void ratios, which makes it difficult to generalize the observed data. A combination of empirical, dimensional and inspectional analysis is presented as a useful tool to reduce the number of variables with influence in the design parameters, such as the wetted rack length or the mean discharge coefficient. This work includes a broad experimental campaign in which wetted rack length and mean discharge coefficient are characterized using five different bottom racks with different void ratios (area between bars divided by total area). T-shaped flat and circular bars are considered as well as five different longitudinal slopes. Empirical and inspectional analyses have allowed us to verify, in two different ways, the relation between wetted rack length and incoming flow through potential functions. The influence of the viscous forces has been studied as a function of the incoming flow. Similar results may be obtained when analysing the Froude number at the beginning of the rack, depending on the wetted rack length. A new formulation for calculating the mean discharge coefficient and wetted rack length is proposed.

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Section: Q0mentioning

confidence: 99%

Section: Flow Depth Vs Incoming Flowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Empirical, Dimensional and Inspectional Analysis in the Design of Bottom Intake Racks

García

Castillo

Carrillo

et al. 2018

Water

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“…The flow through an inlet on the bottom of the channel (bottom intake racks) is often used as flow outlet which finds application in irrigation channels to purge excess water, trash racks on small mountain rivers and urban drainage system to carry away rain water (grated inlet), (Chow 1959;Ramamurthy et al 1989;Subramanya 1994;Brunella et al 2003;Righetti and Lanzoni 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Actually there is deviation from hydrostatic pressure (Mostkow 1957) and there is streamline curvature (Righetti and Lanzoni 2008). There are attempts to solve the problem analytically and experimentally (Mostkow 1957;Noseda 1955;Subramanya 1994;Brunella et al 2003;Righetti and Lanzoni 2008). Yet most of the researches were based on the experimental findings.…”

Section: Introductionmentioning

confidence: 99%

Rehabilitation of storm water collection systems of urban environment using the small roads as conveyance channels

Tiğrek

Sipahi

2011

Int. J. Environ. Sci. Technol.

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In this study a new grated inlet is proposed for small roads which do not have storm water collection systems. A setup was designed and constructed in the laboratory conditions to calibrate the grated inlet. The inlet is suggested to be installed at the end of the road where the road itself joins to another road or to a street. Thus, newly installed inlet will collaborate with existing storm water collecting system of the main road. Inlet structure covered by slots is installed across a 0.90-m wide flume which will act as a small road. The slots are longitudinal and parallel to the flow direction in order to curtail clogging. It is a tilting flume and both subcritical and supercritical flow regimes can be observed. The intercepted flow by the inlet is measured and the efficiency of the inlet is obtained in terms of longitudinal slope and the Froude number. It is observed that the grate efficiency gets higher as the longitudinal slope approaches to horizontal. Further the grate efficiency also depends on the total flow through the channel. As flow increases in the channel, the efficiency of the grate increases within the limit of the inlet or discharge channels capacity.

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2004

Hydrological Processes

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Hydraulics of Bottom Rack Intake

Cited by 46 publications

References 5 publications

Empirical, Dimensional and Inspectional Analysis in the Design of Bottom Intake Racks

Empirical, Dimensional and Inspectional Analysis in the Design of Bottom Intake Racks

Rehabilitation of storm water collection systems of urban environment using the small roads as conveyance channels

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