Design Guide for Community Water Systems - The Water, Sanitation ...

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additional shielding to prevent the access of surface or floor drainagewater into the structure.d. Valves and controls shall be located outside the storage structure so thatthe valve stems and similar projections will not pass through the roof ortop of the reservoir.7.0.13. Access to Unpressurized Finished Water Storage StructuresUnpressurized finished water storage structures shall be designed andconstructed to allow convenient access to the interior for cleaning andmaintenance. The number, location, and spacing of hatches and manwaysshall conform to the federal Occupational Safety and Health Administration(OSHA) regulation 29 CFR, Part 1910. Roof or top hatches shall be framed atleast six inches above the surface of the roof or top at the opening, shall befitted with a solid, water tight, hinged cover which overlaps the framedopening and extends down around the frame at least two inches, and shallhave a locking device.7.0.14. Discharge PipesThe discharge pipes from all reservoirs shall be located in a manner that willprevent the flow of sediment into the distribution system. Removable siltstops should be provided.7.0.15. Safety Devices at Unpressurized Finished Water Storage StructuresUnpressurized tanks and reservoirs shall be equipped with safety devices toallow safe inspection, repairs, maintenance, and painting.a. Ladders, handrails, safety cages and other safety appurtenances shallconform to the federal OSHA regulation 29 CFR, Part 1910. These safetyappurtenances shall also conform to any applicable local ordinances,codes, or standards that are more restrictive than OSHA standards. Nowire, cable or other device shall be attached to the ladders, handrails orother safety appurtenances in such a manner that will obstruct or impairthe safe use of these devices.b. Ladders, ladder guards, balcony railings, and safely located entrancehatches shall be provided where applicable.c. Railings or handholds shall be provided on elevated tanks where personsmust transfer from the access tube to the water compartment.d. Elevated tanks with riser pipes over eight inches in diameter shall haveprotective bars over the riser opening or a safety handrail around the riseropening inside the tank.e. Warning lights should be provided on standpipes and elevated storagetanks and shall be provided when required by the Federal AviationAdministration (FAA) or local codes.Aug. 29, 2003Page 138
f. Cables, power conduits, antenna brackets or similar devices shall beinstalled inside properly constructed conduits. Properly designed bracketsmust secure these to the storage structure.7.0.16. Disinfection of Unpressurized Finished Water Storage StructuresDisinfection of unpressurized finished water storage tanks and reservoirsfollowing construction, repairs, painting, or other maintenance shall be donein accordance with the latest edition of the AWWA Standard for Disinfectionof Water-Storage Facilities, AWWA C652.a. At least one sample shall be analyzed to indicate microbiologicallysatisfactory water before the facility is placed into operation.b. Disposal of chlorinated water from the tank shall be in accordance withMissouri Clean Water Commission requirements to protect aquatic life.7.1. Tanks and Reservoirs for Finished Water Storage7.1.1. Fire Protection.Public water supplies that provide fire protection shall have finished waterstorage tanks, reservoirs, and other facilities with sufficient capacity toprovide minimum design needed fire flow for the length of fire duration andshall provide adequate storage to meet diurnal peak flow with fire flow beingconsidered.a. The minimum allowable design needed fire flow and design supply workscapacity are 250 gallons per minute for a fire duration of two hours.b. Other commonly used design needed fire flows with the equivalent firedurations are listed in section 7.5.7.1.2. No Fire Protection.Public water supplies that do not provide the fire protection shall havesufficient finished water storage to meet the minimum design operatingpressure and flow for the diurnal flow pattern on the design maximum usageday with all well pumps, treatment plants, high service pumps, booster pumps,or other equipment that affect pressure and flow in operation. This can beachieved by the following methods:a. Provide finished water elevated storage with nominal capacity equal to orgreater than one day’s average demand. For standpipes, the volumeabove the elevation, which provides 20 psig at the tower base, shall becounted as nominal capacity. (This method does not requiredocumentation or estimation of diurnal flow pattern or design maximumday usage.)b. Provide ground level finished water storage with nominal capacity equalto or greater than one day’s average demand. Duplex high service pumpswith capacity capable of meeting design instantaneous peak flow with theAug. 29, 2003Page 139
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Design GuideforCommunity Water Syst
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2.18. AUTOMATION. .................
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4.3.11. Waste Disposal. ...........
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CHAPTER 6 -- MINIMUM CONSTRUCTION R
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Maximum Hour Demand -- The amount o
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and deviations are subject to indiv
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(blank)Aug. 29, 2003Page viii
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a. A description of the nature and
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a. Hydrological data, stream flow,
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4. Be conducted under the same oper
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maintaining the new technology and
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1.2.1. Plans shall include:a. Suita
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name, number, effective date, publi
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e. The site will provide all-weathe
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chlorine residual by methods in "St
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etween them, a six-inch band of con
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a. Regulated recreational activitie
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e done to determine the degree and
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1. Pumping rate;2. Pumping water le
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sieve analyses of the water bearing
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e circulated in the annular space s
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emoved. Therefore, every well shoul
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3.2.6.4. Pitless well units.a. The
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SIZE (inches)6 id.8101214 od.161820
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Chapter 4 -- Tre atment4.0. General
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settling basins shall be not less t
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3. Shall have valves located outsid
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d. Be automatic. Timers on automati
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2. Uniformity coefficient not great
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j. During air scour, the backwash w
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. An easily readable meter or flow
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4.3.4. Design Pressure Drop or Tran
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4.3.9. Flow Meters.Totaling rate of
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utilized, shall be 1.0 milligrams p
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. Removal of precursors prior to ch
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5. Consideration shall be given to
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. Pre-treatment requirements. Iron,
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t. Housing. Bagged salt and dry bul
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4.7. Iron and Manganese ControlIron
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Where phosphate treatment is used,
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3. Series and parallel flow piping
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approval of the department before u
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contact time must be provided to co
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Page 108 and 109: 1. Obtain a letter of approval from
Page 110 and 111: 6. The provisions for the final dis
Page 112 and 113: a. Missouri River or Mississippi Ri
Page 114 and 115: 5.0.3. General equipment design.Gen
Page 116 and 117: minimize chemical dust created by t
Page 118 and 119: 1. At least 30 days of chemical sup
Page 120 and 121: e. Hand pumps shall be provided for
Page 122 and 123: 5.2. Chemicals.5.2.1 Shipping conta
Page 124 and 125: outside atmosphere, above grade and
Page 126 and 127: 5.4.2. Acids.a. Acids shall be kept
Page 128 and 129: 4. Anhydrous ammonia contact with c
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Page 132 and 133: fluoride feed line when a metering
Page 134 and 135: possibility for overfeed.h. Protect
Page 136 and 137: caution.d. Where taste and odor con
Page 138 and 139: e installed to monitor the flow of
Page 140 and 141: the generator dielectrics. Sufficie
Page 142 and 143: published by the National Fire Prot
Page 144 and 145: g. Water from pump gland drainage s
Page 146 and 147: 6.3. Pumps.6.3.1.Pumps shall be siz
Page 148 and 149: 6.4.2.2. Suction lines.Suction line
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Page 152 and 153: parameters: average winter (Decembe
Page 154 and 155: a. Overflows shall be sized to perm
Page 158 and 159: largest pump out of service shall b
Page 160 and 161: 7.1.4. CostsAs part of the final en
Page 162 and 163: 7.4. Hydropneumatic Storage7.4.1. H
Page 164 and 165: provided on larger tanks as needed
Page 166 and 167: 7.5.2. Fire Suppression Rating Sche
Page 168 and 169: in areas served by rural water dist
Page 170 and 171: connected directly to any sewer. Su
Page 172 and 173: 8.6.5. Force mains.There shall be a
Page 174: 8.11.2. Filling device.A filling de
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