FLOOD PREVENTION TECHNIQUES - 1

Ra in Gardens

Ra in gardens a re shallow, landscaped spaces that consists of n ative shrubs, perennials, and grasses also designed perpendicular to the slope of the land roofs, lawns, patios, and driveways. Ra in gardens are normally d ry and only hold water af ter rainfall. Although t hey can b e placed in most spaces, r ain gardens shouldn’t be placed 10 ft within a building’s foundation or 25 f t from the septic system.

Process

They are planted in a small depression, which is generally formed on a l ow point of a natural slope. S and and gravel are then added t o make the rain garden work more underground through the soil and deep -rooted plants and help r emove watershed.

Pros Cons

- A sustainable draining system (SuDS) t hat is heavy rainfall.

- Like storm drains, it collect s rainwater from roofs

- Improper construc tion can l ead t o drainage

- Increased erosion rates.

- Hard to design in areas with steep slopes.

-Spans only 100-400 sq.ft, so heavier rainfall would be hard to absorb.