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1. Rain Water Harvesting for Urban
Flooding
Presented to: Sir Abdul Basit
Presented by:
Muhammad Umair
Maaz Ahmed Khan
Amina Bibi
Syed Sajjad Hassan

2. Urban Flooding:
• The term urban flood consists of two parts “urban”
and “flood”. Flood is defined as “an overflow of a large
body of water over areas not usually inundated”. Thus,
flooding in urban areas is caused by intense and/or
prolonged rainfall, which overwhelms the capacity of
the drainage system.

3. Why are floods in urban areas particularly
dangerous?
• Floods in Urban areas are extremely dangerous because of the speed at which
they occur. People do not have the time or luxury to move their valuables. The
unpredictability of the flood can cause severe damage to people.
• Moving to another area becomes extremely challenging; therefore people tend
to lose their vehicles such as bikes and cars as inches of water is good enough to
move a decent sized car. The health aspect of Urban Flooding is often overlooked
as people tend to worry about

4. Causes of urban flooding:
• There are many reasons on which urban flooding can takes place.
Some of the following main reasons for urban flooding are:
 Meteorological Factors: Heavy rainfall, cyclonic storms, and
thunderstorms.
 Hydrological Factors: Overbank flow channel networks, the
occurrence of high tides impeding the drainage in coastal cities.

5. Continue…
1) Unplanned Urbanization:
• Unplanned Urbanization is the key cause of urban flooding. A major concern is blocking of natural
drainage pathways through construction activity and encroachment on catchment areas, riverbeds, and
lakebeds.
•
1) Climate Change:
• Climate change due to various anthropogenic events has led to extreme weather events.
1) Poor Solid Waste Management System:
• Domestic, commercial and industrial waste and dumping of construction debris into the drains also
contribute significantly to reducing their

6. Impacts of Urban Flooding
 Impact on Human Life:
 Loss of life & physical injury
 A rise in mosquito-borne diseases
 Impact on Economy:
 Damage to buildings, roads, and other infrastructures
 Disruptions to industrial production
 Impact on Transport and Communication:
 Increased traffic congestion, disruption in rail services
 Disruption in communication- impact on the telephone lines, internet cables
 Impact on the environment:
 Loss of tree cover, loss of habitat
 Impact on animals in the zoo, the prevalence of stray animals

7. Solutions of Urban Flooding
• Rainwater harvesting an ultimate solution to urban flooding
• Rainwater harvesting is the best solution for urban flooding. Rain water harvesting is collection and storage of rain
water that runs off from roof tops, parks, roads, open grounds, etc. This water runs off can be either stored or recharged into
the ground water.
• There are a lot of techniques in which the rainwater can be stored and used in a constructive way. Some of the techniques
are:
• Sponge City Concept
• Roof-top Rainwater Harvesting (RRH)
• Underground Tanks
• Rain Saucer

8. Uses of Rainwater Harvesting System
 Drinking
 Cooking
 Washing vegetables
 Agricultural purposes
 Toilets (Bathing and Flushing Toilets)
 Gardens, House plants and Outdoor plants
 Lawns
 Water for pets, wildlife, livestock
 Pools and other water bodies
 Washing vehicles and equipment
 Fire protection
 Composting