Precast U-Drain
T-25
RCC U drain T25 NCR
Manufactured to IS 10292:2019 and Indian standards
What is a Precast Concrete U-Drain?
Precast concrete infrastructure supplier in NCR
A precast concrete U-drain is a factory-manufactured reinforced cement concrete unit cast in a U-shaped cross-section, widely specified by State PWDs, NHAI, and municipal bodies across India as the standard solution for collecting and conveying surface water runoff.
The U-shaped hydraulic cross-section maximises the wetted perimeter-to-area ratio, producing high flow velocities that minimise sedimentation under the extreme monsoon rainfall intensities experienced across India.
Precision Engineering
Manufactured in controlled factory environments, ensuring consistency, accuracy, and minimal risks.
5x Faster Installation
Precast manufacture eliminates site curing delays, critical for NHAI and PWD project programmes.
Optimized Hydraulic Profile
The U cross-section maximises hydraulic radius & flow velocity, enabling efficient stormwater conveyance.
Standards & Compliance
Manufactured and tested under standards required for tenders, NHAI contracts, and State PWD specifications.
50+ Years Design Life
Controlled water-cement ratio and proper curing per IS 456:2000 achieve far better whole-life value.
Low Maintenance
Minimal long-term needs suit PWD budgets and National Highway Operation & Maintenance contracts.
Installation Guide
Excavate trench to required invert level with 100mm granular bedding allowance. Compact sub-grade to 95% Standard Proctor Density per IS 2720 Part 7. Maintain safe batter slopes or provide trench support per IS 3764 where required. Set gradient sight rails before placing first unit.
Lay 100mm of clean 10–20mm crushed stone bedding (free-draining, non-plastic). Lower U-drain units using lifting frames, never by sidewalls. Work from the downstream end upstream. Apply IS-compliant elastomeric sealant to rebated joints where watertight performance is specified. Joint gaps must not exceed 10mm.
Haunch both sides to springline with M15 PCC or granular fill. Backfill in 150mm compacted layers. Keep heavy plant 500mm clear of walls. Install T-25 rated cover slabs as the final operation to match specified loading class.
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Frequently Asked Questions
The T designation refers to the load classification. T-25 is designed for direct heavy vehicular loading, including trucks and construction equipment; T-6 is designed for pedestrian and light motor vehicle loading. The structural geometry of the wall and base section differs accordingly. If your drain will be in a location subject to HCV or construction traffic overrun, specify the T-25. For residential roads, campus paths, and urban footpaths, the T-6 is the correct specifications. If you are unsure, share your site details, and our team will advise.
Standard BRHC U-drains are M30 grade, which satisfies IS 456:2000 requirements for reinforced concrete in moderate exposure conditions. M35 is available for heavily loaded industrial applications, aggressive chemical environments, and projects where client specifications require a higher grade. Concrete cube test records at 7 and 28 days are maintained for all production batches and provided as part of the QA documentation package for contract orders.
Yes. BRHC U-drains are manufactured to IS 456:2000 and designed to IRC:SP:42:2014 standards, and cover slabs are rated to IRC:6 T-25 and T-6 loading classes — fully meeting MoRTH Section 305 requirements for drainage works on National Highway projects. We provide material test certificates, concrete strength records, and dimensional inspection data in the format required for NHAI and MoRTH QA submissions. Contact our technical team with your project's QAP for compliance confirmation.
Per IRC:SP:42:2014, the minimum recommended gradient for surface drains to achieve self-cleansing velocity (approximately 0.6–0.9 m/s) is 1:500 on paved surfaces and 1:200 on earthen shoulders. In flat terrain, flatter gradients are acceptable with regular maintenance. BRHC's hydraulic team can calculate minimum gradient requirements for your design discharge and drain size — contact us with your catchment area and rainfall data.
Yes. For sites with high sulphate soils (ACEC Class DS-3 or above per IS 456:2000 Table 5), acidic groundwater (pH below 6.5), or hydrocarbon contamination — conditions frequently encountered in industrial estates and former agricultural land — BRHC specifies SRPC cement (IS 12330) in the concrete mix. Supply your site investigation report at enquiry stage and our technical team will recommend the appropriate specification.
