For the most part, grate inlets are used in sag configurations in gutters, adjacent to concrete traffic barriers or rails (where curb inlets would not be practicable), V-shaped gutters with no curb or barrier, and ditches.

Combination inlets can capture up to 18% more flow than a stand-alone grate inlet, due to their ability to remove debris from the grate. Combination inlets require the same input data as both Curb and Grate Inlets.

May 15, 2024 · Also known as storm drains or curb inlets, catch basins are structures designed to collect and channel excess water from paved surfaces such as roads, parking lots, and sidewalks. They typically have a grated ground-level opening leading to an underground collection system.

Sep 8, 2023 · To kinda add to this, colloquially a catch basin is a curb inlet because it only collects water through a curb opening, a “inlet” is a grate inlet because it collects water through a gutter opening, and an inlet with a hood is a combination inlet because it collects water through both.

Sep 16, 2022 · Grate inlets will intercept all of the gutter flow passing directly over the grate if the grate is sufficiently long and the flow velocity is low. When the grate is too short or the flow velocity is too high, splash-over occurs, and the grate does not intercept all of the frontal flow.

Grate Inlet vs. Curb Opening Inlet – Capture Grate Inlet, No Clogging Factor Curb Opening Inlet. Grate Inlet, 50% Clogging Factor. GI Implications • Grate inlets theoretically perform well over much larger range of drainage area • Assuming heavy clogging, can reduce drastically, may need to consider adding additional inlets

The sweeper inlet has an interception capacity equal to the sum of the curb opening upstream of the grate plus the grate capacity. The grate capacity in this case is reduced by the interception by the upstream cub opening.

The basic difference between a combination inlet and a grate inlet is that the curb opening receives the carry-over flow that passes between the curb and the grate. The reduction factor for clogging of this type of inlet shall be 0% for the curb opening and 35% for the grate inlet.

The curb opening inlet is longer than the grate inlet and intercepts the flow before the flow reaches the grate. The sweeper inlet is more efficient than the equal length combination inlet and the curb opening has the ability to intercept any debris which may clog the grate inlet.

The combination inlet is a vaned grate on a catch basin with a hooded curb cut area. Its vaned grate is very debris efficient, and if the grate does become clogged, the overflow goes into the hooded opening.

Aug 9, 2013 · Combination inlets either at a sag or continuous on the street which combine a curb opening inlet and a grate inlet for the stormwater runoff.

Grate inlets provide a grate opening in the gutter or waterway. As a class, grate inlets perform satisfactorily over a wide range of gutter grades. Their main disadvantage is that they are easily clogged by floating trash and should not be used without a curb opening where total interception of flow is required.

Jul 8, 2021 · Storm drain inlets are the openings that allow stormwater to flow into a storm drainage system. There are many types of inlets, including: Curb opening inlet: A long, narrow, horizontal opening at the edge of a curb. Grate inlet: A grate covering to a drain at the low point of a road, swale, or another drainage site.

When the curb opening length is longer than the grate length, the program assumes the open curb portion to be located upstream of the grate, often called a “sweeper” inlet.

Grate Inlets are set with one side against a curb. Therefore, they receive side flow along only one side of the grate (the length side), and the frontal flow is calculated using a typical curb and gutter section.

grate inlet performance was very similar to that of curb-opening inlets. Inlets in series increased efficiencies by almost 20 percent over the efficiencies of single inlets.

Combination inlets consisting of a grate and a curb opening are considered advisable for use in sags where hazardous ponding can occur. Equal length inlets refer to a grate inlet placed along side a curb opening inlet, both of which have the same length.

Also referred to as gutters, storm grates or curb drain inlets, catch basins are the first line of defense against property flooding. Visible from above, these assets may vary in placement on your property but they serve the same function underground.

Sep 14, 2012 · Collected test data on inlet efficiency were compared to previously published methods for the inlets and were found to deviate by as much as 45% and an average of 13% at typical design depths of 0.1–0.15 m. Existing methods for the curb inlet were modified, and empirical design equations were developed for the combination inlets.

Grate inlets are deceiving in that they appear to be able to capture a lot of runoff because they are flush to the gutter. But in fact, they are the least effective among the street inlets. When using these, don’t expect to get much runoff removal, especially when employed On Grade.