Contech Slotted Drain™
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ENGINEERED SOLUTIONS Contech Slotted Drain™ PIPE SOLUTIONS

Contech Slotted Drain™ Efficiently Remove Surface Water Contech Slotted Drain is a practical, aesthetically pleasing inlet for the efficient removal of surface water on streets and highways. It also is widely used in parking lots and other similar locations, where it removes sheet flow without complex multiple grades or water channeling devices like asphalt dikes, berms and curbs. Slotted Drain is fabricated from Contech Corrugated Steel Pipe. The pipe is cut along a longitudinal axis, and a trapezoidal or straight-sided grate with reinforcing spacer plates is welded in place to form a 1...

Contech Slotted Drain Is Proven Superior To Other Drain Systems Long, successful history Fewer debris problems Contech Slotted Drain has been used at countless locations throughout the United States for more than 40 years… simply because it is the most effective solution to water removal problems. FHWA testing on straight-sided grate has shown its efficiency to resist clogging to range from 73% to 86%. Slotted Drain will retain its effectiveness even when a localized blockage occurs in one area. Under similar conditions, a conventional drain would be severely restricted. Debris is less...

Product Details Modified Hugger Band Pipe Slotted Drain made from Contech Corrugated Steel Pipe with HUGGER® Bands meets applicable portions of AASHTO Designation M36 and ASTM A760. Pipe is fabricated from galvanized steel for excellent durability, or from ALUMINIZED STEEL™ Type 2 when more corrosion resistance is required. Slotted Drain is available in 12-inch through 36-inch diameter HEL-COR® pipe and in 14-gage and 16-gage. Thirty and thirty-six inch diameter pipe is also available in 12-gage. Slotted Drain may also be provided in 18-inch through 36-inch diameter ULTRA FLO® pipe, and in...

Wide Range of Applications Contech Slotted Drain is a versatile and cost effective solution for surface water removal on many sites. About 3,900 feet of 12-inch HEL-COR®, 16-gage Slotted Drain in the Indianapolis, Indiana, area allows water to drain between the lane barrier and the shoulder. Replacing curbs and drain basins with continuous lengths of Slotted Drain opens up an obstruction-free and single grade roadside that greatly enhances the effectiveness of the shoulder to improve the safety on the highway. Slotted Drain is widely used in parking areas and driveways, where its ability to...

Grate Inlet Hydraulic FHWA Test Slotted Drain can be used to intercept runoff in any one of the following ways: 3. Overland sheet flow Slotted Drain is used effectively to intercept runoff from wide, flat areas such as parking lots, highway medians—even tennis courts and airport taxiways. In these installations, the drain is placed transverse to the direction of flow, so that the open slot acts as a weir intercepting all of the flow uniformly along the entire length of the drain. The water is not collected and channeled against a berm (curb), as required by slot-on-grade installations. 1....

30 EXAMPLE: Given S = .01 ft/ft Z = 24 Q = 4.5 cfs SOLUTION: 1. Connect points from S and Z to turning line. 2. Connect point on turning line to Q. 3. Read Lr = 25 feet 4. Next use Figure B. The nomograph for the slotted drain inlet length is based on: (n = 0.015) Lr = (4.762) Q 427 S'305 Z 466 if n * .015, Lr = Lr ( )087 (Extrapolation not recommended. Formula and nomograph derived from testing over limited range of Q.) Definitions S — Longitudinal gutter or channel slope, ft/ft Sx — Transverse slope, ft/ft Z — Transverse slope reciprocal d — Depth of flow over the slot, ft Lr — Length of...

Installation Contech Slotted Drain’s primary advantages are its economical design and ease of installation. Unlike typical parking lots that require grades to be sloped in four directions for each storm collection grate, a parking lot with slotted drain requires only one transverse and one longitudinal slope for the entire drainage area. That translates to a lower-cost installation for the contractor and owner; and less stake-out for the engineer. Because of slotted drain’s efficiency in removing surface water, fewer collectors and laterals under the roadway are needed. Grate extensions...

High slump concrete After the Slotted Drain has been leveled to grade, it is important that a high slump concrete or lean grout (minimum 750 psi compressive strength) be used as backfill. The high slump concrete helps ensure a uniform foundation and side support and transfers the live load to the surrounding earth. In non-live load areas, A-1- a AASHTO M145 backfill or cement stabilized sand is sufficient. Once the Slotted Drain is backfilled with high slump concrete, cover the slotted opening before surfacing and leave it covered until the paving operation is complete. Duct tape, metal...

Slotted Drain Specification 1.0 General 1.1 This specification covers Slotted Drain used for removal of water as shown on the plans. 4.1 The grate shall be galvanized in accordance with ASTM A 123 except with a 2-ounce galvanized coating. 1.2 The corrugated steel pipe used in the Slotted Drain shall meet the requirements of AASHTO M36/ASTM A 760. The CSP shall be made of ALUMINIZED STEEL Type 2 (AASHTO M274). The diameter and gage shall be as shown on the plans. 5. Grate Attached to CSP 5.1 The grate shall be fillet welded a minimum 1-inch long to the CSP on each side of the grate at every...

Slotted Drain is often used at airports where large flat areas are necessary to accommodate airplanes moving in and out of terminal areas. The municipal airport at Colorado Springs, Colorado, solved water ponding problems adjacent to the airport aprons with Slotted Drain. It intercepts sheet flow before ponding begins. For airport loading (tire pressure in excess of 125 psi), contact your Contech Sales Engineer. Designers and engineers installing walkways and promenades around sports stadiums, civic centers, shopping malls, parks and other pedestrian-traveled surfaces have used Slotted...