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

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provided on larger tanks as needed for access and ventilation duringpainting;b. Each tank shall have a water sight glass, a pressure gage, a mechanicalmeans of adding air, a pressure blow off for excess air, and a drain. Thedrain shall discharge above the normal ground surface with no directconnection to a sewer or storm drain;c. The piping connected to each tank shall be equipped with sufficient valvesand bypass lines to allow the tank to be taken offline, drained, cleaned,repaired and painted without causing loss of pressure in the distributionsystem;d. Each tank shall have adequate automatic controls to manage both thewater level in the tank and the pressure of the air cushion; ande. Each tank shall be sufficiently housed to protect all appurtenances and thetank from freezing. Each tank shall be located above the normal groundsurface. Design shall be based on a 100-year return frequency extendedlow temperature period and average wind velocity.7.4.12. Pressure and Bladder Tanks with Gross Volume of less than 1,000 GallonsPressure tanks and bladder tanks with gross volume less than 1,000 gallonsper tank shall be designed and constructed with the following appurtenancesand features:a. Each tank shall be above the normal ground surface and completelyhoused in a heated building to prevent freezing;b. The piping connecting tanks shall have sufficient valves and bypass linesto allow each individual tank to be taken offline, drained, repaired,painted, or replaced without causing loss of pressure in the distributionsystem;c. The tanks shall be equipped with automatic controls to controlpressure/water level in the tanks. A means to manage the volume andpressure of air in the air cushion of pressure tanks shall be provided butthis may be done manually with portable equipment. There shall be atleast one pressure gage in the tank manifold; andd. Multiple tanks may be used to achieve the total design volume needed.7.4.13. Protection to Metal SurfacesProper protection shall be given to metal surfaces of pressure tanksa. Tanks constructed of steel or other metal subject to corrosion shall haveboth interior and exterior surfaces painted.1. Exterior paint should contain less than 100 milligrams of lead perkilogram of dried paint to prevent removed paint from being classifiedas a hazardous waste.2. Interior paint shall be certified for drinking water use under the latestANSI/NSF Standard 61.b. Tanks constructed of corrosion resistant metals shall not be required to bepainted. Corrosion resistant metals shall be chosen to resist corrosionAug. 29, 2003Page 146
from all naturally occurring chemicals in the water stored, all chemicalsadded as part of water treatment including chlorine and other disinfectantsand the natural atmosphere including current and expected future airpollutants in the area.7.5. Fire Flow Information7.5.1. Standard Fire Flow with Corresponding Fire Durations.Standard fire flow with corresponding fire duration is indicated in the table here.Figure 5 - Design Needed Fire FlowDesign Needed Fire Flow(gallons per minute)Fire Duration(hours)250 2500 2750 21,000 21,250 21,500 21,750 22,000 22,250 22,500 23,000 33,500 34,000 44,500 45,000 45,500 46,000 46,500 47,000 47,500 48,000 48,500 49,000 49,500 410,000 411,000 412,000 4Aug. 29, 2003Page 147
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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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(This page is intentionally blank.)
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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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a. Sanitary sewers with the approva
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1. Obtain a letter of approval from
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6. The provisions for the final dis
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a. Missouri River or Mississippi Ri
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Page 116 and 117: minimize chemical dust created by t
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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
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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 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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