Storm Water Drainage System Detail with RCC Construction Specifications

This detailed drawing presents a comprehensive storm water drainage (SWD) system designed for implementation between roadways and parking areas. The plan shows a 1000×1000mm (inner dimensions) reinforced concrete drain with 150-250mm thick walls, featuring MS grating covers for surface water collection. Key structural details include reinforcement specifications with 8-10mm diameter HYSD bars (Fe 500 grade) placed at 200-250mm centers, and 150×150mm haunches at corners. The drainage system incorporates a 2.5% cross slope toward drains with inspection chambers specified at 25m intervals. Construction materials include M-30 grade concrete for RCC work and M-15 for PCC leveling course, with specified concrete covers of 75mm for earth-facing surfaces and 40mm for non-earth facing surfaces. The drawing also details pavement composition for adjacent areas, featuring 60mm thick polymer-coated precast interlocking concrete blocks (300 kg/sq.cm compressive strength) over 40mm sand bedding, 200mm WMM, and 500mm subgrade with >8% CBR. Backfilling specifications require 10-day curing before simultaneous backfilling from both sides, with a minimum soil bearing capacity of 10T/sq.m beneath base rafts.