# Unit 5: Constructed Wetlands

Expected Study Load : 8 hours.

# Learning Objectives:

After completing this unit, you will:

• know about the different types of constructed wetlands (CWs)
• be able to distinguish between the free water surface CW and sub-surface flow CWs
• know basic principles of wastewater treatment in constructed wetlands
• know how to estimate the required surface area of a constructed wetland, using simple design parameters such as load of BOD per square metre and day
• have an awareness of operation and maintenance issues for constructed wetlands
• have a mental picture of what it looks like to construct sub-surface flow CWs