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

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7.1.4. CostsAs part of the final engineering certification on a tank/reservoir constructionproject, the engineer shall submit the final cost of the tank excluding land oreasement costs.7.2. Plant StorageThese requirements are in addition to the applicable requirements listed insubsections 7.0. and 7.1.7.2.1. Filter Backwash.Wash water tanks shall be sized to provide the filter backwash at the designfilter backwash rate. The wash water tanks, pumps, and finished waterstorage must be designed to allow backwashing several filters in rapidsuccession in order to meet the most extreme plant operational problemsexpected. Plants with three or fewer filters should have sufficient wash watercapacity to backwash all filters in rapid succession.7.2.2. Clear Wells.Clear wells shall be designed and constructed as part of the overall design ofplant and distribution facilities to provide adequate disinfection, adequatebackwash volume, and adequate distribution flow and pressure.7.2.3.1. A suitable vent(s) and overflow shall be provided.7.2.3.2. Disinfectant contact time shall meet the requirements of theJanuary 1992 Missouri Department of Natural Resources’ Public DrinkingWater Program Guidance Manual for Surface Water System TreatmentRequirements and 10 CSR 60-4.055 Disinfection Requirements.7.2.3.3. Clearwell storage should be sized in conjunction with distributionsystem storage to allow constant rate plant operation without intermittentshutdowns. A minimum of two clear well compartments should beprovided.7.2.3.4. Clearwell storage should be sized to allow the flexibility of one,two, or three eighth-hours shifts per day operation.7.2.3. Receiving Basins and Pump Wet WellsReceiving basins and pump wet wells for finished water shall be designed asfinished water storage structures.7.2.4. Finished Water Adjacent to Unsafe WaterFinished water must not be stored or conveyed into a compartment adjacent tounsafe water when the two compartments are separated by a single wall.Aug. 29, 2003Page 142
7.3. Distribution StorageThese requirements are in addition to the applicable requirements listed insubsections 7.0. and 7.1.7.3.1. Minimum PSIG at Normal Ground ElevationDistribution storage shall be designed and constructed in conjunction withproduction facilities, pumping facilities, and distribution mains to provide aminimum of 35 psig pressure at the normal ground elevation at every point ofthe distribution system during all conditions of design flow. Normal operatingconditions include extended drought usage and diurnal peak flow.7.3.2. Working Pressure PSIG at Normal Ground ElevationDistribution storage should be designed and constructed in conjunction withproduction facilities, pumping facilities, and distribution mains to provide aworking pressure of 60 psig at the normal ground elevation at every point inthe distribution system during all normal operating conditions except fireflow.a. Areas with elevation differences of more than 150 feet should be dividedinto multiple pressure zones so that each zone has pressure between 35and 100 psig.b. Multiple pressure zone systems should have separate storage facilities foreach zone and should be equipped so that water can be transferredbetween zones with pump stations and pressure control valves.c. Each public water system shall be designed to maintain normal systempressures and flows with any storage facility out of service formaintenance or should have at least two storage tanks or reservoirs so thatremoving a tank or reservoir for maintenance will not disrupt distributionsystem pressure.7.3.3. Distribution Storage ControlsDistribution storage facilities shall be equipped with adequate controls tomaintain levels in the tanks/reservoirs.a. Level indicating devices should be located at a central location.b. Pumps should be controlled from tank levels with the signal transmittedby telemetering equipment when any appreciable head loss occurs in thedistribution system between the pump and the storage structure. Pressurecontrol valves (usually installed on the discharge line and pump to wasteline with a control system that opens and closes these valves simultaneousto control pressure surge/water hammer) should be installed on pumpswhen pumps and storage facilities are not adjacent.c. Overflow and low level warnings or alarms should be located at places inthe community where these will be under responsible surveillance 24hours per day.Aug. 29, 2003Page 143
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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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a. Sanitary sewers with the approva
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1. Obtain a letter of approval from
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Page 114 and 115: 5.0.3. General equipment design.Gen
Page 116 and 117: minimize chemical dust created by t
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Page 126 and 127: 5.4.2. Acids.a. Acids shall be kept
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Page 132 and 133: fluoride feed line when a metering
Page 134 and 135: possibility for overfeed.h. Protect
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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 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
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