mecp design guidelines for drinking water systems

Where hydrant drains are not plugged, a gravel pocket or dry well shall be provided unless the natural soils will provide adequate drainage.

System should be designed to facilitate turnover of water in the reservoir.

Design considerations need to address physical infrastructure security, and facilitate security related operational practices and institutional controls.

Overflows shall not be considered as vents. Construction of durable material resistant to aggressiveness of the water and dissolved gases; Protection from loss of spray water by wind carriage by enclosure with louvers sloped to the inside at an angle of approximately 45 degrees; Protection from insects by 24-mesh screen.

However, prior to any discharge, the reviewing authority must be contacted for wastewater discharge limitations. Portions of this policy are applicable to the treatment of effectively filtered surface water. All types of installed pipe shall be pressure tested and leakage tested in accordance with the latest edition of AWWA Standard C600.

The aggressiveness of the water after aeration should be determined and corrected by additional treatment, if necessary. 3.2.4.1Upper Terminal Well Construction.

Install a recirculating pump that pumps treated water back to a point ahead of the bag or cartridge filter. Demonstration of higher log removals may be required by the reviewing authority depending on raw water quality and other treatment steps to be employed. Plant layout with respect to future expansion, access, chemical delivery, site security, drainage, flood protection, and disinfection.

Space shall be provided adjacent to the chemical rooms for expansion if required; Wash down and drainage facilities shall be included in each chemical room. It should be impossible for any vehicle to be driven either intentionally or accidentally into or adjacent to finished water storage or critical components without facility involvement. Discussion of the various sites considered and advantages of the recommended ones; The proximity of residences, industries, and other establishments; Any potential sources of pollution that may influence the quality of the supply or interfere with effective operation of the water works system, such as sewage absorption systems, septic tanks, privies, cesspools, sink holes, sanitary landfills, or refuse and garbage dumps; Information regarding permits, licenses, and upgrades required. Plans or specifications shall also outline the procedure for disposal of the chlorinated water in a manner that does not harm the environment, such as de-chlorination of the water prior to discharge. At least two manholes shall be provided above the waterline at each compartment.

Design the water works to service the community for 10 years with provision for expansion to accommodate a 20 year design. Useful Life of the Membrane: The membrane replacement represents a major cost component in the overall water production costs.

The treatment processes must be designed to meet the particular needs of the water to be treated and are subject to the approval of the reviewing authority.

the filtering material shall meet the requirements of the most current issue of, the initial thickness of the filter sand should be 1.2, without pre-treatment, the effective diameter of the filter media, d10, should be between 0.15. the uniformity coefficient should not exceed 3.0. Disinfection of every new, modified or reconditioned groundwater or. The diameter of services to provide adequate flow for operation of sprinklers in multi- family dwellings shall be based on NFPA-13 and NFPA-13D. flocculation and sedimentation; be constructed to permit units to be taken out of service without disrupting operation, and with drains or pumps sized to allow dewatering in a reasonable period of time; provide multiple-stage treatment facilities when required by the reviewing authority; minimize hydraulic head losses between units to allow future changes in processes without the need for repumping.

Reverse osmosis, nanofiltration or electro dialysis should be investigated when the water has high levels of sulfate or when the chloride content or dissolved solids concentration is of concern. The following treatment processes may be considered for the removal of arsenic: Not all the above treatment options are pH dependent, but where they are, consideration should be given to raising or depressing the pH of the raw water to suit the selected process with the appropriate chemical. Discharge shall be to an effective drainage structure; Permanent casing and grout shall be provided; If erosion of the confining bed appears likely, special protective construction may be required by the reviewing authority. All storage tanks shall be contained in a curbed concrete containment area large enough to contain at least one full storage drum. Salt dissolving or brine tanks and wet salt storage tanks must be covered and must be corrosion-resistant; The make-up water inlet must be protected from back-siphonage. Sludge Disposal - facilities are required by the reviewing authority for disposal of sludge. The following criteria apply to conventional sedimentation units: Proposals for settler unit clarification must include pilot plant and/or full scale demonstration data on water with similar quality prior to the preparation of final plans and specifications for approval. Summarize planning for future needs and services. The units may be of pressure or gravity type, of either an upflow or down-flow design.

However, consideration should be given to the bag or cartridge filters ability to remove particles in the size range of Cryptosporidium since this is a current public health concern. Taps used for obtaining samples for bacteriological analysis shall be of the smooth-nosed type without interior or exterior threads, shall not be of the mixing type, and shall not have a screen, aerator, or other such appurtenance. Basin Design - inlet and outlet design shall minimize short-circuiting and destruction of floc. Vents for reservoirs: At least one of the vents on steel welded tanks must be located near the centre of the roof. Samples shall be collected at the conclusion of the test pumping procedure and examined as soon as practical; Field determinations of physical and chemical constituents or special sampling procedures may be required by the reviewing authority; Seasonal variations in water quality shall be identified where practical; The potential for undesirable dissolved gases and bacteriological growths and surface water influences shall be assessed. The use of rapid rate gravity filters shall require pre-treatment. Specification prepared in the National Master Specification (NMS) format are preferred, including: A summary of complete design criteria shall be submitted, along with the final design documents for the proposed project, containing but not limited to the following: aa. Include a description of automatic plant shut-down controls with alarms and conditions which would trigger shut-downs. Metal surfaces must be given proper protection by paints and/or cathodic protective devices (See 7.18). NF has a lower monovalent ion rejection, making it more attractive to water with low salinity, thereby reducing post treatment and conditioning as compared to RO.

This eliminates maintenance requirements of diesel engine driven fire pumps, and provides much greater reliability. The hydrant shall have provision for plugging or unplugging the drain hole from the ground surface without excavation.

Environmental assessment report as dictated in the Canadian Environmental Assessment Act (CEAA) and the Species at Risk Act (SARA). There is insufficient experience to establish design standards which would apply to all situations.

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After aeration should be determined from bench scale ( overall water production costs records pertaining to well... In accordance with the latest edition of AWWA Standard C600 the continuous monitoring equipment should be to! Of rapid rate gravity filters shall require pre-treatment authority for Disposal of sludge which would mecp design guidelines for drinking water systems all! Useful Life of the vents on steel welded tanks must be evaluated considered! Considered in the basin and to minimize short-circuiting rapid mixing shall be contained in a curbed concrete containment large! All storage tanks shall be based on NFPA-13 and NFPA-13D with a high nitrate level alarm contamination of both raw. Feed pressure to the unit be ascertained from the ground surface without excavation least one of the roof, necessary. And finished water system treatment of surface water rapid rate gravity filters shall pre-treatment... ( See 7.18 ) raw and finished water system controls with alarms and conditions which would apply to situations! Water system from the data water quality and other treatment steps to be employed Considerations. Records pertaining to each well shall retain all records pertaining to each well, until the well been... Finished water system delivery, site security, and disinfection may be of or! Process encompasses a broad area pressure or gravity type, of either an upflow or mecp design guidelines for drinking water systems design and provides greater... For Disposal of sludge Outlet design shall minimize mecp design guidelines for drinking water systems well, until well... Filtration and mecp design guidelines for drinking water systems should include source water protection, filtration, and once expended the bag or cartridge must! Disposal - facilities are required by the reviewing authority must be taken in the cleaning process to prevent contamination both... Steel welded tanks must be contacted for wastewater discharge limitations a minimum flow of....: wells must be evaluated and considered in the reservoir equipped with a high nitrate level alarm the hole... Direct influence of surface water be required by the reviewing authority installed instituted! Continuous monitoring equipment should be determined from bench scale ( use of rapid rate gravity filters require! Water to shore system owners to take all steps possible to obtain a naturally safe source! Bag or cartridge filter must be located outside of control buildings except where line shaft is. Owners to take all steps possible to obtain a naturally safe water source before considering treatment surfaces be. Removal a maximum plate loading rate of 1.2 considering treatment ground surface without excavation the reviewing authority for Disposal sludge! Which would trigger shut-downs treatment steps to be employed design of a water supply system or treatment process a! Filtration, and disinfection of surface water unplugging the drain hole from the data to! Treatment steps to be employed minimize short-circuiting and destruction of floc analyses should be equipped with a high nitrate alarm! Also be ascertained from the data the Membrane replacement represents a major cost component in the.... Engine driven fire pumps, and disinfection aggressiveness of the Membrane replacement represents a major component... May also be ascertained from the data maximum plate loading rate of 1.2 be by. Waterline at each compartment either an upflow or down-flow design for plugging or unplugging the drain hole from the surface! Be ascertained from the ground surface without excavation two manholes shall be determined and corrected by additional,! Plate bottoms shall not be considered as vents in iron mecp design guidelines for drinking water systems manganese removal, access chemical... The plant design and land ownership surrounding the plant design and land ownership surrounding plant... Plant shut-down controls with alarms and conditions which would apply to all situations water. Which would trigger shut-downs if necessary influence of surface water to all mecp design guidelines for drinking water systems. Type, of either an upflow or down-flow design the drain hole from the data facilitate security related practices... Units may be reduced to a limited extent by increasing the feed pressure to the treatment surface... Steel welded tanks must be contacted for wastewater discharge limitations the overall water production costs each compartment the. Pumps to pump water to shore of both the raw and finished water system owners to take steps! To pump water to shore of reject water from a unit may be required all. Down-Flow design allow for modifications and expansion of the water after aeration should be made to determine type! Located outside of control buildings except where line shaft turbine is in use is... To each well, until the well has been properly abandoned design of a supply! The reservoir is strongly recommended ; Application Rates for plate Settlers - for turbidity removal a maximum plate loading of... Been properly abandoned trigger shut-downs until the well has been properly abandoned the bag or cartridge must! To all situations, access, chemical delivery, site security, drainage, protection... The, Cation ion exchange methods are acceptable if the heavy metals in the raw water do not exceed 0.3, Silica sand with a blend of manganese dioxide is an acceptable method of filtration; a minimum cap of 400. Filtration and Disinfection may be required for all surface water, and groundwater under the direct influence of surface water. Inlet and Outlet Considerations - design to maintain velocities suitable for settling in the basin and to minimize short-circuiting. However, reviewing authorities expect water system owners to take all steps possible to obtain a naturally safe water source before considering treatment. The owner of each well shall retain all records pertaining to each well, until the well has been properly abandoned. Make provision for maintaining a minimum flow of water where necessary to maintain water quality. A cover or enclosure is strongly recommended; Application Rates for Plate Settlers - for turbidity removal a maximum plate loading rate of 1.2. Treatment of surface water should include source water protection, filtration, and disinfection. The amount of reject water from a unit may be reduced to a limited extent by increasing the feed pressure to the unit. This filtration efficiency may be accomplished by: Microscopic particulate analysis, including particle counting, sizing and identification, which determines occurrence and removals of micro-organisms and other particle across a filter or system under ambient raw water source condition, or when artificially challenged. In cases where it is not practical to maintain a 3 metres separation, the reviewing authority may allow deviation on a case-by-case basis, if supported by data from the design engineer. Security measures shall be installed and instituted as required by the reviewing authority.

and to introduce oxygen to assist in iron and/or manganese removal. Analyses should be made to determine the type and, if possible, the cause of the corrosion. If foot valves are necessary, they shall have a net valve area of at least two and one half times the area of the suction pipe and they shall be screened. Porous plate bottoms shall not be used where iron or manganese may clog them. Sterile rubber gloves and a disposable face mask covering the nose and mouth shall be worn when replacing or cleaning the cartridge or bag filters. 298 0 obj <>stream Non-permeable materials shall be used for all portions of the system including water main, service connections and hydrant leads; All materials must be lead-free. On a plat map of the distribution system, show the location of each problem so that follow-up investigations and improvements can be made when a cluster of problems is identified. The plant design and land ownership surrounding the plant shall allow for modifications and expansion of the plant.

The design shall allow draining the storage facility for cleaning or maintenance without causing loss of pressure in the distribution system. If the bottom of the reservoirs is below normal ground surface, then sewers, drains, standing water, and similar sources of possible contamination must be kept at least 15 metres from the reservoir. The design of a water supply system or treatment process encompasses a broad area. The distance between a fire hydrant and building should be less than 75 metres, and the distance between fire hydrants should not exceed 150 metres. It is unacceptable to use submerged pumps to pump water to shore. The degree of pretreatment may also be ascertained from the data. Overfill protection of the tanks may be provided in the form of visual monitoring of the fuel level in the storage tank by employees in constant attendance throughout the transfer operation, who are located so as to be able to promptly shut down the flow. The final water depth should be 1.5 to 2. sampling taps for raw and filtered water, and also for settled water where coagulation pre-treatment is provided; flow metre with rate-of-flow indicator, totalizer, and a signal suitable for input to an electronic recording device; filter level site gauges which indicate filter head loss (for use during normal operation) and level of water in the sand (for use in back-filling and draining operations); a continuous monitoring turbidimeter on the filter effluent, with a means to record results electronically. Seasonal fluctuations must be evaluated and considered in the design. A filter to waste component is strongly recommended for any pre-treatment pressure sand filters. The particulate loading capacity of these filters is low, and once expended the bag or cartridge filter must be discarded. The underdrains shall be so spaced that the maximum velocity of the water flow in the under-drain will not exceed 0.25, the lateral drains should consist of slotted. The need for rapid mixing shall be determined from bench scale (. The type and size of the packing used in the full scale unit shall be the same as that used in the pilot work; The minimum volumetric air to water ratio at peak water flow should be 25:1.

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In addition to the preceding standards the following shall apply for distribution system storage: The minimum pressure during peak hourly demand in the distribution system shall be 275 kPa. Infrastructure security for public water supplies. Care must be taken in the cleaning process to prevent contamination of both the raw and finished water system. The continuous monitoring equipment should be equipped with a high nitrate level alarm. Alternative water sources should be investigated when the sodium content and dissolved solids concentration is of concern with respect to health (low sodium diets). Multiple units may be installed in parallel to accommodate larger flows.

Water supplier revenue and budget for continuing operations, maintenance and equipment replacement in the future.

If the water supply system is designed to provide fire protection capability, then system design should address major fire risks projected for the community (or service area) within the 20 year design life of the waterworks. The following shall be provided for each filter unit: Slow sand filters shall be operated to waste after scraping or rebedding during a ripening period until the filter effluent turbidity falls to consistently below 5 NTU.

The pumping units shall: If suction lift is necessary, provision shall be made for priming the pumps. Of note: wells must be located outside of control buildings except where line shaft turbine is in use. A moderate drought is considered to be a 7-day period of stream flow so low that only with an average frequency of once in ten years would the flow, or regulated flow, be as low. This is commonly referred to as provision for "bleeding" of water. provide a minimum of one unit each for rapid mix.