## Info

"In inches.

fcNo loss head through sand and gravel or pipe is assumed: flow is based on Q

= CjVA, where V

= >/2gh and Cd =

0.6. with free discharge. (Design filter for

twice the desired flow to ensure an adequate delivery of water as the frictional resistance in the filter to the flow builds up. Use two or more units in parallel.) Note: The loss of head through a clean filter is about 3 in.; hence add 3 in. to the "maximum head" in the table and sketch to obtain the indicated flow in practice. A minimum 3-4ft of water over the sand is advised. Example: To find the size of a filter that will deliver a maximum of 500 gpd: From above, a filter with a ¿-in. orifice and a head of water of 3ft 9in. will meet the requirements. Filtering at the rate of 50 gpd/ft2 of filter area, the required filter area is 500 gpd/[50 gal/(ft2)(day)] = 10ft2. Provide at least 2 days storage capacity.

twice the desired flow to ensure an adequate delivery of water as the frictional resistance in the filter to the flow builds up. Use two or more units in parallel.) Note: The loss of head through a clean filter is about 3 in.; hence add 3 in. to the "maximum head" in the table and sketch to obtain the indicated flow in practice. A minimum 3-4ft of water over the sand is advised. Example: To find the size of a filter that will deliver a maximum of 500 gpd: From above, a filter with a ¿-in. orifice and a head of water of 3ft 9in. will meet the requirements. Filtering at the rate of 50 gpd/ft2 of filter area, the required filter area is 500 gpd/[50 gal/(ft2)(day)] = 10ft2. Provide at least 2 days storage capacity.

FIGURE 2.3 Typical devices for the control of the rate of flow or filtration. Plant capacity: 50 to 100 percent greater than average daily demand, with clear well.

Sand expansion = 40 to 50% = 33.6 to 36 in. for 24-in. sand bed = 25 to 35% for dual media, anthracite, and sand

## Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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