Water System Design Manual, December 2009
Document source : www.doh.wa.gov
Page 266
December 2009
Water System Design Manual
6.b.2. Filter Rate
Maximum flow rate to be treated _____ gpm (attach pump curve)
Manufacturers recommended treatment unit application rate _____ gpm/sq. ft
Must be less than 5 gpm/sq. ft for most filtration media and less than 15 gpm/sq. ft for solid
manganese dioxide filtration with extensive pilot testing at this high rate.
Area of treatment unit(s) proposed _____ sq. ft
Actual application rate (max flow / area) _____ gpm/sq. ft
Actual application rate < recommended? Yes No
Actual application rate < pilot filter rate Yes No
6.b.3. Backwashing Requirements
Manufacturers recommended backwash application rate _____ gpm/sq. ft
Must be greater than 12 gpm/sq. ft for most filtration media and greater than 32 gpm/sq. ft
for solid manganese dioxide media.
System's backwash output at working pressure of _____ psi _____ gpm
Backwash pump pressure ______ psi (attach pump curve)
Area of treatment unit(s) proposed _____ sq. ft
Actual backwash rate (pump output / area of filter) _____ gpm/sq. ft
Actual backwash rate > recommended? Yes No
Does backwash cycle include surface scour? Yes No
Does backwash cycle include air application? Yes No
6.b.4.1. Oxidant Chemical Feed Pump
(if applicable)
Manufacturer's specifications attached Yes No
Make ____________________ Model ____________________
Pressure range of water system (psi) _____ min _____ max
Max injection pressure of pump (psi) _____
Summary :
Filter Rate Maximum flow rate to be treated _____ gpm (attach pump curve) Manufacturers recommended treatment unit application rate _____ gpm/sq. System's backwash output at working pressure of _____ psi _____ gpm Backwash pump pressure ______ psi (attach pump curve) Area of treatment unit(s) proposed _____ sq.
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