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

More documents

Recommendations

Info

a. A description of the nature and extent of the area to be served, includinglayout maps or drawings showing the legal boundaries of the water system(s).b. Provisions for extending the water system to include additional areas.c. Appraisal of the future requirements for service, including existing andpotential residential, industrial, commercial, institutional, and other watersupply needs.d. Usage rates, water loss rates, unusual conditions, and population per serviceconnection. This information shall be based on one or more of the alternativeslisted in items 1. through 4.1. Historical data from the public water system, if available. This data shallbe representative of climatic conditions that affect demand and source.2. If such historical data from the public water system are not available, datafrom a comparable water system may be used.3. If neither historical nor comparable water system data are available, thefollowing information shall, as a minimum, be used for design purposes:i. Population per service connection for permanent residential dwellingunits including houses, mobile homes, condominiums, apartments, andmultiplexes shall be approximately three (3.0) persons/dwelling unit; andii. Domestic water usage for residential dwelling units excludinglawn/garden irrigation usage shall be an average of 80 gallons per personper calendar day, except that for rural water districts this may be anaverage of 60 gallons per person per day.4. Other usage criteria may be used in lieu of the criteria listed in thepreceding item (1.1.2.d.3.) if the engineer provides adequate justification.e. For lawn watering, the following estimates may be used:Housing TypeSprinkler Type Flow per HouseModerate/Middle Class End of Hose 1.25 gpmEstate Automatic 2 gpmf. Peak flow (instantaneous, one hour, two hour, three hour, or four hour) shallbe based on--1. Historical data on the public water system, if available from the watersystem. These data shall be representative of climatic conditions thataffect demand and source. If historical data is used, the entire distributionsystem hydraulics shall be calculated;2. If such historical data from the public water system are not available, datafrom a comparable water system may be used; or3. If neither historical nor comparable water system data are available, thefollowing information shall be used for design purposes:Instantaneous Peak Flow = Domestic Peak Flow* + Lawn/Garden Irrigation PeakFlow + Commercial, Larger Users, Confined FeedingOperations*Domestic peak flow should be calculated as the greater of:1. One gallon per minute per connection, or2. Peak = 12(number of connections) 0.515 .4. Other peak flow criteria may be used in lieu of the criteria listed in theAug. 29, 2003Page 2
preceding item (1.1.2.f.3.) if the engineer provides adequate justification; forexample, rural water districts may calculate domestic peak flow as the greaterof 0.75 gallons per minute per connection orPeak = 9(number of connections) 0.515 .g. Maximum day flow shall be based on:1. Historical data if these data are available from the public water system.This data shall be representative of climatic conditions that affect demandand source);2. If historical data are not available, data from a comparable system may beused; or3. If neither historical or comparable data are available, the following datamay be used for design purposes:Maximum Day Flow = 150% of Average Day Flow.4. Other maximum day flow criteria may be used in lieu of this criteria in1.1.2.g.3. if the engineer gives adequate justification.1.1.3. Alternate plansWhere two or more solutions exist for providing public water supply facilities,each of which is feasible and practicable, discuss the alternate plans. Givereasons for selecting the solution recommended, including financialconsiderations, and a comparison of the certification level of water systemoperator required.1.1.4. Soil, ground water conditions, and foundation problemsThe engineering report shall specifically address whether the native soils aresuitable for main bedding and backfill and note the extent that crushed stone,gravel or other purchased bedding/backfill will be needed, along with estimatedcosts. The report shall also address the potential for rock excavation in thevarious soils encountered, along with estimated costs.1.1.5. Flow requirementsFlow requirements, including:a. Hydraulic analyses based on flow demands and pressure requirements (seeChapter 8 of this document); andb. Fire flows, when fire protection is provided, design shall be based on theInsurance Services Office (ISO) Fire Flow Criteria.1.1.6. Sources of water supplyDescribe the proposed source or sources of water supply to be developed, thereasons for their selection, and provide information as follows:1.1.6.1. Surface water sourcesIncluding where pertinent:Aug. 29, 2003Page 3
Page 1: Design GuideforCommunity Water Syst
Page 4 and 5: 2.18. AUTOMATION. .................
Page 6 and 7: 4.3.11. Waste Disposal. ...........
Page 8: CHAPTER 6 -- MINIMUM CONSTRUCTION R
Page 12 and 13: Maximum Hour Demand -- The amount o
Page 14 and 15: (This page is intentionally blank.)
Page 16 and 17: and deviations are subject to indiv
Page 18 and 19: (blank)Aug. 29, 2003Page viii
Page 22 and 23: a. Hydrological data, stream flow,
Page 24 and 25: 4. Be conducted under the same oper
Page 26 and 27: maintaining the new technology and
Page 28 and 29: 1.2.1. Plans shall include:a. Suita
Page 30 and 31: name, number, effective date, publi
Page 32 and 33: (This page is intentionally blank.)
Page 34 and 35: e. The site will provide all-weathe
Page 36 and 37: chlorine residual by methods in "St
Page 38 and 39: etween them, a six-inch band of con
Page 40: (This page is intentionally blank.)
Page 46 and 47: a. Regulated recreational activitie
Page 48: e done to determine the degree and
Page 51: 1. Pumping rate;2. Pumping water le
Page 55 and 56: sieve analyses of the water bearing
Page 57 and 58: e circulated in the annular space s
Page 59 and 60: emoved. Therefore, every well shoul
Page 61 and 62: 3.2.6.4. Pitless well units.a. The
Page 63 and 64: SIZE (inches)6 id.8101214 od.161820
Page 65 and 66: Chapter 4 -- Tre atment4.0. General
Page 67 and 68: settling basins shall be not less t
Page 69 and 70: 3. Shall have valves located outsid
Page 71:
d. Be automatic. Timers on automati
Page 76 and 77:
2. Uniformity coefficient not great
Page 78 and 79:
j. During air scour, the backwash w
Page 80 and 81:
. An easily readable meter or flow
Page 82 and 83:
4.3.4. Design Pressure Drop or Tran
Page 84 and 85:
4.3.9. Flow Meters.Totaling rate of
Page 86 and 87:
utilized, shall be 1.0 milligrams p
Page 88 and 89:
. Removal of precursors prior to ch
Page 90 and 91:
5. Consideration shall be given to
Page 92 and 93:
. Pre-treatment requirements. Iron,
Page 94 and 95:
t. Housing. Bagged salt and dry bul
Page 96 and 97:
4.7. Iron and Manganese ControlIron
Page 98 and 99:
Where phosphate treatment is used,
Page 100 and 101:
3. Series and parallel flow piping
Page 102 and 103:
approval of the department before u
Page 104 and 105:
contact time must be provided to co
Page 106 and 107:
a. Sanitary sewers with the approva
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
Page 130 and 131:
combustible material.2. Powdered ac
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
Page 150 and 151:
cessation of minimum essential serv
Page 152 and 153:
parameters: average winter (Decembe
Page 154 and 155:
a. Overflows shall be sized to perm
Page 156 and 157:
additional shielding to prevent the
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
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?