### Rapid Sand Filter System DesignA city with a population of 800,000 requires a rapid sand filter system. The average water demand is estimated to be 350 liters per capita per day. The filter design application rate is 120 cubic meters per day per square meter.#### Design Parameters:i. **Filter System Design:** - Determine the number, length, and width of the filters. - The ratio of length to width (L/W) should be 1.5. - The maximum allowable length is 12 meters.ii. **Backwash Water Volume Calculation:** - Calculate the backwash water volume as a percentage of the total water treated. - The backwash time is 12 minutes. - Rise rate is 0.5 meters per minute. - Backwashing occurs once every two days.

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A rapid sand filter system is designed for a city with population is 800,000 and the average water demand is estimated at 350 l/capita-day. The filter design application rate is 120 m/d- m? i. Design the filter system (number, length and width if L/W is 1.5 and length cannot exceed 12 meters) Calculate the backwash water volume as a percent of total water treated if the backwash time is 12 minutes and rise rate is 0.5 meters/min and backwashing is done once every two days. ii.

A rapid sand filter system is designed for a city with population is 800,000 and the average water demand is estimated at 350 l/capita-day. The filter design application rate is 120 m/d- m? i. Design the filter system (number, length and width if L/W is 1.5 and length cannot exceed 12 meters) Calculate the backwash water volume as a percent of total water treated if the backwash time is 12 minutes and rise rate is 0.5 meters/min and backwashing is done once every two days. ii.

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

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Chapter2: Loads On Structures

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Question

### Rapid Sand Filter System Design

A city with a population of 800,000 requires a rapid sand filter system. The average water demand is estimated to be 350 liters per capita per day. The filter design application rate is 120 cubic meters per day per square meter.

#### Design Parameters:

i. **Filter System Design:**
- Determine the number, length, and width of the filters.
- The ratio of length to width (L/W) should be 1.5.
- The maximum allowable length is 12 meters.

ii. **Backwash Water Volume Calculation:**
- Calculate the backwash water volume as a percentage of the total water treated.
- The backwash time is 12 minutes.
- Rise rate is 0.5 meters per minute.
- Backwashing occurs once every two days.

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