What is the minimum freeboard required for a facultative pond?

A minimum freeboard of 0.6 m is recommended to be provided above the maximum operating water level (Clause 4.4).

What are the recommended side slopes for pond embankments?

Inner slopes should generally not be steeper than 1V:3H and outer slopes not steeper than 1V:2H, subject to the soil's stability (Clause 4.3).

What is the required thickness for a clay liner?

If a soil or clay liner is used, it should have a minimum compacted thickness of 300 mm, laid in multiple layers (Clause 5.2).

What is the minimum top width for the embankment?

A minimum top width of 2.5 m is recommended to allow for vehicular access for maintenance and inspection (Clause 4.2).

IS 5611

: 1987

Code of Practice for Construction of Waste Stabilization Ponds (Facultative Type)

CurrentSpecializedCode of PracticeEnvironmental · Public Health Engineering

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This standard outlines the code of practice for the construction of facultative type waste stabilization ponds. It covers key aspects including site selection, embankment construction, pond lining methods, and the installation of inlet/outlet structures to ensure structural integrity and effective wastewater treatment.

Code of Practice for Construction of Waste Stabilization Ponds (Facultative Type)

Quick Reference Values

Minimum freeboard0.6 m

Minimum top width of embankment2.5 m

Recommended inner side slope (max)1V : 3H

Recommended outer side slope (max)1V : 2H

Minimum compacted thickness of clay lining300 mm

Maximum liquid depth1.5 m

Practical Notes

Proper compaction of the embankment and liner is the most critical factor to prevent leakage and ensure long-term stability of the pond.

Establishing a grass turf on the outer slopes and top of the embankment is essential for preventing soil erosion from rain.

The design of inlet and outlet structures must prevent short-circuiting of flow, which would reduce the pond's treatment efficiency.