Hydraulic Calculation Drain

This sheet provide detailed calculation steps to design storm water drainage system in india by using indian standard codes and CPHEEO manuals which helps to design and calculte profile and size of drains.

Stormwater drainage systems in India are designed and constructed following the guidelines provided by the Indian Standard Codes and CPHEEO (Central Public Health and Environmental Engineering Organisation) manuals. These documents ensure proper planning, design, and maintenance of stormwater drainage systems to manage runoff and prevent flooding, water pollution, and other environmental issues. Here is a summary of the key aspects of stormwater drainage system design in India:

1. Indian Standard Codes: The Bureau of Indian Standards (BIS) has developed a series of Indian Standard (IS) codes relevant to stormwater drainage systems, such as IS 1200, IS 1742, and IS 1172. These codes provide guidelines for the materials, design, construction, and maintenance of stormwater systems, including pipes, culverts, gutters, and other components.

2. CPHEEO Manual: The CPHEEO manual on 'Sewerage and Sewage Treatment' includes detailed guidance on stormwater drainage systems, including the planning, design, construction, and operation of these systems. It provides a comprehensive framework for addressing stormwater management issues in India.

3. Drainage System Components: Stormwater drainage systems typically consist of various components, such as catch basins, gutters, pipes, culverts, and outfalls, designed to collect, convey, and discharge stormwater runoff safely.

4. Design Criteria: The design of stormwater drainage systems considers factors such as rainfall intensity, catchment area, runoff coefficients, and population growth. Additionally, drainage systems should be designed to accommodate peak flows from storm events with specified return periods (e.g., 2, 5, or 10 years).

5. System Sizing: Stormwater drainage systems should be sized to accommodate the expected peak runoff rates, considering factors such as pipe slope, material, and roughness. Appropriate hydraulic models and calculations should be used to determine the optimal sizes of pipes, culverts, and other components.

6. Construction Materials: The choice of construction materials for stormwater drainage systems depends on factors such as durability, cost, local availability, and environmental considerations. Common materials include concrete, plastic (PVC, HDPE), and metal (galvanized steel, ductile iron).

7. Maintenance and Operation: Regular inspection, cleaning, and maintenance of stormwater drainage systems are crucial to ensure their effective operation and prevent flooding, blockages, and water pollution. Maintenance schedules should be established based on the CPHEEO manual guidelines and local conditions.

8. Environmental Considerations: The design and operation of stormwater drainage systems should consider environmental factors, such as water quality, erosion control, and groundwater recharge. The use of sustainable drainage systems (SuDS), like permeable pavements, infiltration trenches, and bio-retention areas, can help mitigate environmental impacts.

In summary, the design and construction of stormwater drainage systems in India are guided by Indian Standard Codes and CPHEEO manuals, which consider various aspects such as system components, design criteria, sizing, materials, maintenance, and environmental considerations. Proper planning and implementation of these guidelines are essential for effective stormwater management and preventing urban flooding and pollution.