IS 7740:1985 is the Indian Standard (BIS) for construction and maintenance of road gullies. This code of practice provides guidelines for the construction and maintenance of road gullies used for collecting surface water from road surfaces. It covers their location, spacing, types (trapped and untrapped), construction details, and essential maintenance procedures to ensure effective road drainage.
Code of practice for construction and maintenance of road gullies
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Grating Material (Typical) | Grey Cast Iron, Grade FG 200 (as per IS 210) | Spheroidal Graphite Cast Iron, Grade EN-GJS-500-7 | BS EN 124-2:2015 |
| Load Class (Main Carriageways) | Heavy Duty (test load often derived from other standards, approx. 20-35 Tonnes) | Class D400 (400 kN test load, approx. 40.8 Tonnes) | BS EN 124-1:2015 |
| Minimum Water Seal Depth | 75 mm | 75 mm (historically in BS 5911-6, now a drainage system design parameter) | BS 5911-6:2004 (Withdrawn) |
| Gully Chamber Concrete Grade (Min) | M15 (15 N/mm² characteristic strength) | C40/50 (40 N/mm² characteristic cylinder strength) | BS EN 1917:2002 |
| Gully Pot Internal Diameter | 450 mm (typical design) | DN 450 (Nominal Diameter 450 mm) is a common size | BS EN 1917:2002 |
| Coating for Iron Castings | Black bituminous composition or other approved coating | Uniform coating of bituminous material, asphaltic, or other approved type | AASHTO M 306-10 (2020) |
| Third-Party Certification | ISI Mark (optional but recommended) | Required marking by a third-party certification body (e.g., Kitemark, BSI) | BS EN 124-1:2015 |