Manufacturer of Sediment Control Devices & Inlet
Protection
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Why use a SedCatch® Sediment Basket™?
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Sediment Baskets - Square & Rectangular
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The Sediment Basket size is the same size as the grate.
| 21-3/4" x 21-3/4" Sediment Basket includes dump basket |
$110.00 |  |
| 22" x 16-7/8" Sediment Basket includes dump basket |
$110.00 | |
| 22-1/2" x 22-1/2" Sediment Basket includes dump basket |
$110.00 | |
| 24" x 16-1/4" Sediment Basket includes dump basket |
$110.00 | |
| 24" x 22-1/4" Sediment Basket includes dump basket |
$115.00 | |
| 27" x 27" Sediment Basket includes dump basket |
$120.00 | |
| 28-3/4" x 11-5/8" Sediment Basket includes dump basket |
$115.00 | |
| 29-1/2" x 16-3/4" Sediment Basket includes dump basket |
$115.00 | |
| 29-1/2" x 17-5/8" Sediment Basket includes dump basket |
$115.00 | |
| 35-1/2" x 17-5/8" Sediment Basket includes dump basket |
$115.00 | |
Custom sizes can be made with an order of 20 units or more.
Diverters for Combination Inlets
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| 26" Diverter Use on 18" to 24" curb inlets. Includes wire tie. |
$10.00 | |
| 32" Diverter Use on 25" to 30" curb inlets. Includes wire tie. |
$11.00 | |
| 38" Diverter Use on 31" to 36" curb inlets. Includes wire tie. |
$12.00 | |
Sediment Baskets - Round
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The Sediment Basket size is the same size as the grate.
| 21-1/2" Round Sediment Basket includes dump basket |
$105.00 | |
| 22-1/2" Round Sediment Basket includes dump basket |
$105.00 | |
| 23-1/2" Round Sediment Basket includes dump basket |
$110.00 | |
| 24-1/2" Round Sediment Basket includes dump basket |
$110.00 | |
| 25-1/2" Round Sediment Basket includes dump basket |
$115.00 | |
| 26-1/2" Round Sediment Basket includes dump basket |
$115.00 | |
| 27-1/2" Round Sediment Basket includes dump basket |
$120.00 | |
Custom sizes can be made with an order of 20 units or more.
All Shapes and Sizes
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Independent Testing Results
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The SedCatch® Sediment Basket™ was subjected to full scale testing by TRI/Environmental, Inc. The test was performed in general accordance with ASTM D 7351, Standard Test Method For Determination Of Sediment Retention Device Effectiveness In Sheet Flow Application, though the protocol was modified to present the flow from the storm event to an inlet. In order to make the test as realistic as possible, the test was allowed to continue the entire duration of the storm event.
On the 1.5% Sediment Load Test, all of the water was filtered and it collected in excess of 80% of the sediment load introduced.
On the 6% Sediment Load Test, it initially filtered 100% of the water. Over time; the accumulated sediment reduced the filtering capacity of the device such that some of the water passed through the overflow. In practice, as flows taper off, once again 100 % of the water would be filtered. It still collected nearly 64% of the introduced sediment for the entire rain event.
Diverters For Combination Inlets
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A diverter is needed on combination inlets (where there is a grate and throat opening in the curb). The diverter directs the water through the grate for filtering by the Sediment Basket and acts as a barrier for heavy sediment that is being pushed along by the water during heavy rains. When the sediment hits the diverter it drops straight down into the Sediment Basket.
Combination Inlet Installation
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Since each Sediment Basket is the exact size as the grate, every installation is flawless. Remove grate, attach the diverter to the back of the grate. Seat the main Sediment Basket on the frame. Place the Dump Basket inside the main basket. Place the grate back into position. See it on SedCatch's YouTube Page
Minimizes Ponding of the Water in the Roadway
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Some inlet protection devices work by ponding, a Sediment Basket™, as seen above, works by filtering and providing a drop zone to collect sediment. A Sediment Basket™ has over 3 times the filtering capacity and 3 times the overflow capacity than the grate cover and tube method on a typical 30”x18” combination inlet.
VS.
The geotextile covering the grate above becomes virtually impervious once it accumulates a quarter inch of sediment. Some inlet protection devices require water depths of 3” to 4” before passing more than a minimal volume of water. (All 4 of these photos were taken within minutes of each other.)
The Neighbors and Salespeople will prefer the cleaner look
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VS.
When using a SedCatch Sediment Basket, it does not look like a jumbled mess of geotextile or debris in the street.
VS.
It does not leave sediment on the curb. It always looks as though it had just been serviced because it collects the sediment below the grate in the basket.
One Man, 2 Minute Service
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The two basket design collects sediment like a coffee filter. There is no need to remove the Main Basket. This method makes sediment removal much easier and reduces wear and tear which is one of the many reasons Sediment Baskets™ have such a long lifespan. For videos, see SedCatch's Youtube page.
Friendly to Snow Plows and Street Sweepers
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A Sediment Basket™ does not have any geotextile or straps that can be caught or get entangled with a street sweeper or Tubes that can become displaced.
A Sediment Basket™ is only ¼” thick, well within the tolerances of pavement joints, expansion joints, the thickness of the last coat of asphalt, etc., The small diverter along the back of the grate is low and well out of the way of a plow, and it is not susceptible to being dislodged by a plow pushing snow.
Will not cause a sheet of ice to form in the roadway.
A Sediment Basket™ does not change the operational characteristics of a storm water inlet under freezing conditions. Water can continue to run through the grate and out the overflow cutouts in the basket as if it wasn’t even there. Some devices will freeze up and keep water from draining, resulting in a large ice patch in the street.
Emptying Dump Basket
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The removal of the sediment in the above photos series took less than two minutes from start to finish. Sediment is collected in a convenient Dump Basket™. Since the Sediment Basket does not hang from the grate, equipment is not required to safely lift the grate and sediment at the same time. See it on SedCatch's YouTube Page.
Flow Comparison Study of 30"x18" Combination Inlet
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30" x 18" Combination Inlet
There are two parameters to consider when evaluating an inlet protection device; how efficiently it collects sediment and how well it can pass floodwaters.
The SedCatch® Sediment Basket™ has been independently tested by TRI/Environmental. It had a retention efficiency rating of 80%+ on a simulated 4” rain event with a 1.5% sediment load. There have been no comparable tests published of the grate cover and tube method.
With regard to allowing floodwaters to pass, a comparison of open area can give an idea of comparable performance. The Sediment Baskets™ overflow cutouts in the basket allows water to flow through the grate even when full of sediment, and it has only a 1-1/2” reduction of the open area of the curb opening. The Grate Cover and Tube method blocks all water flow through the grate once a ¼” of sediment accumulates over the geotextile and has a 4”+ reduction in open area of the curb opening.
SedCatch Sediment Basket
Filter Flow Area
(Diameter of basket)(3.14)(height of basket)
(18”) (3.14) (20”) = 1130 square inches of filtering area
Overflow Area
(Width of Cutouts) (Height of Cutouts) (Number of cutouts) + (Width of curb opening) x (Height of Curb Opening above diverter)
(8” x 2” x 4) + (30” x 4.5”) = 199 square inches of overflow area
| Filtering Capacity | Overflow Capacity | |
| Sediment Basket | 1130 square inches | 199 square inches |
Note: In practice, since the sediment accumulates in the bottom of the basket the vertical geotextile will continue to flow.
Grate Cover and Tube Method
Filter Flow Area
(Legnth of Grate) x (Width of Grate) x (50% open area of grate)
30" x 18" x 50% = 270 square inches
Plus:
(Legnth of tube) x (Height of tube) x (50% of geotextile that is not pressed against pipe)
30" x 4" x 50% = 60 square inches
Total Filtering Capacity 270 + 60 = 330 square inches of open filter area
Overflow Area
(Width of curb opening) x (Height of curb opening above tube)
30" x 2" = 60 square inches
| Filtering Capacity | Overflow Capacity | |
| Grate Cover and Tube Method | 330 square inches | 60 square inches |
Note: In practice, a slight accumulation of sediment over the geotextile severely restricts flows through the grate.
Conclusion
A Sediment Basket™ has over three times the Geotextile Filter Area and over three times the Overflow Area of the Grate Cover and Tube Method.
Why can a Sediment Basket™ use a low diverter while other devices must use a much higher dam?
The primary method by which a Sediment Basket collects sediment is from filtering the water. The diverter only needs to be high enough to divert as much water as can be filtered. The second method is from collecting the heavy sediment that is being pushed along by the water. When the sediment is pushed to the diverter it drops straight down into the basket. Our trials have shown that a 1-1/2” high diverter works best. A much higher dam is needed when using the grate cover and tube method. The dam has to be high enough to cause the water to pond in the street long enough for the sediment to accumulate in the street.
Foolproof Installation
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Periodic Emptying of Main Basket
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After approximately 10-20 dumps, enough sediment will have made its way around the dump basket that the main basket should be emptied of sediment as shown. It still only takes minutes, and no equipment required.
It is very easy to tell when it needs to be serviced
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Drop a tape measure or measuring stick through the grate (without removing); generally, inspectors will agree that if there is less than 3” of accumulated sediment servicing is not needed.
The Geotextile is Wire Backed
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The geotextile is supported by the welded wire frame. It is not dependent upon the strength of seams or straps for support. Furthermore, the geotextile is not as susceptible to damage from emptying; the two piece design virtually eliminates abrasions, pulling, and tearing while servicing. Inlet protection devices that are suspended from the grate require the grate and sediment be lifted out of the basin in one motion, often requiring the use of equipment to lift safely. Watch the servicing of a Sediment Basket on SedCatch's YouTube Page
Fabric Specification
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We have selected the geotextile with the properties that give the best results under most circumstances. If your site is unique and/or if the engineer or inspector has a preference for a different geotextile specification, we can manufacture the sediment basket with the requested fabric. We probably have the geotextile in stock and can accommodate your request with a two week lead time.
Standard Drawings
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FAQ for SedCatch® Sediment Basket ™
Can you buy replacement liners?
Yes, but you will probably never need one. Since all of the sediment is collected
in the dump basket for easy removal, the wear and tear is minimal. In addition,
the exclusive wire backing takes the stress off the geotextile so there is
little stress on the fabric.
What Happens if a Sediment Baset is neglected?
We know of a number of baskets that were left in place for 6 months or more without servicing. They continued to allow water flow through the grate even though they were nearly full with sediment. The sediment needed to be removed and the geotextile cleaned but they were still intact and operational.
Why can a Sediment Basket™ use a low diverter while other devices must use a much higher dam?
The primary method by which a Sediment Basket collects sediment is from filtering the water. The diverter only needs to be high enough to divert as much water as can be filtered. The second method is from collecting the heavy sediment that is being pushed along by the water. When the sediment is pushed to the diverter it drops straight down into the basket. Our trials have shown that a 1-1/2” high diverter works best. A much higher dam is needed when using the grate cover and tube method. The dam has to be high enough to cause the water to pond in the street long enough for the sediment to accumulate in the street.
Why is our standard fabric a woven geotextile instead of non-woven? Non-woven geotextiles initially give very high flow rates and would appear to be a good choice for this application; however, once they go through a few storm cycles their flow rates can drop 60 to 80 percent. Woven geotextiles maintain their flow rates better over time.
Rolled Grates
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These sediment baskets were made for rolled grates. To order, all we need to know is the size and shape of the grate to send you the correct size Sediment Basket. We can also work off of the grate manufacturer grate number.
For order inquiries, please contact us at 937.435.1920 or amber@sedcatch.com.
Patents
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Sediment Baskets™ are protected by the following patents: US D598,196, US D600,324, US D604,800 other patents pending.
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