Given: Residential road with 20 houses on each side. The houses are 6 meters wid

ID: 115612 • Letter: G

Question

Given:

Residential road with 20 houses on each side.

The houses are 6 meters wide, 9 meters deep.

The road is 150 meters long and 7 meters wide.

Average wastewater production per household: 400 liters/day;

Storm event with return period of 10 years: 27mm/hour.

Questions:

1. What is the amount of wastewater in m3/hour?

2. What is the amount of stormwater in m3/hour?

3. How many times larger the amount of stormwater is compared to the hourly wastewater production (rounding to the nearest hundred)?

1) total waste water = 8000 ltr/day from 20 houses

that is, 0.33cubic meter per hour

2) area = 150 * 25 = 3750 m2 (including house width)

volume = 3750* .025 = 93.75 m3/hr

3) 284 times larger is the stormwater compared to hourly waster water

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