Below is a clear step-by-step procedure to prepare a Collection Sump Pit Drawing (used in wastewater, drainage, STP/ETP, or industrial applications).

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✅ Purpose of a Collection Sump Pit Drawing

The drawing is prepared to show the layout, dimensions, reinforcement, inlet/outlet, pump arrangement, ladder, and accessories required for a sump used to collect stormwater or wastewater prior to pumping.

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🛠 GA & RCC – Drawing Preparation Procedure

1. Gather Design Inputs

Before starting the drawing, collect:

• Capacity of sump (m³ or KL)
• Liquid type (stormwater, sewage, industrial effluent)
• Depth of water + freeboard
• Soil type and water table level
• Pump details (type, number, duty/standby)
• Inlet & outlet pipe diameters
• Structural design data (grade of concrete, reinforcement steel)
• Foundation bearing capacity
• Internal/external waterproofing requirements

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2. Decide General Arrangement

• Select sump shape: Circular / Rectangular
• Depth: Operating level + Pump sump level + Freeboard + Sludge zone
• Provide PCC bed & raft slab thickness
• Plan for anti-buoyancy if water table is high
• Walls thickness as per design

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3. Draw Plan View

Include:

• Overall sump dimensions (L × B or Diameter)
• Inlet pipe location and invert levels
• Outlet pipe and pump delivery points
• Partition wall (if twin compartment)
• Cable tray and pump discharge header
• Maintenance platform
• Vent pipe arrangement

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4. Draw Sectional Views

At least 2 sections:

• Longitudinal section
  • Invert levels
  • Bottom slab, sump bottom slope
  • Freeboard height
  • Pump suction pipe
• Cross section
  • Wall thickness
  • Reinforcement details
  • PCC and raft slab
  • Earth backfill details

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5. Show Reinforcement Details

• Raft slab main & distribution bars
• Wall vertical & horizontal bars
• Starter bars and lap lengths
• Key plan for bar descriptions

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6. Add Structural Details

• Concrete grade (M25 typical)
• Steel grade (Fe500)
• Water proofing notes
• Construction joints
• Anti-floatation key (if needed)

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7. Pump and Accessories Layout

• Guide rails and pump lowering system
• Pump stand
• Cable support hooks
• Pressure gauge + NRV + Gate Valve
• Level switches (LL, L, H, HH)
• Float switches or ultrasonic level sensors

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8. Notes & Specifications

Include:

• General notes
• IS code references (e.g. IS 456, IS 3370)
• Safety ladder material & spacing
• Clear cover
• Backfilling material
• Grouting instructions

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9. Title Block

• Drawing title: Collection Sump Pit – GA / Structural / Reinforcement Drawing
• Project name
• Scale
• North direction (plan view)
• Prepared by / Checked by / Approved by
• Revision history

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✅ Final Drawing Set May Include:

Drawing Type	Purpose
GA Plan & Section	Layout and dimensions
Structural Drawing	Slab & wall design
Reinforcement Details	Bar details
Piping & Pump Layout	MEP details
Bill of Quantities (BOQ)	Material summary