| Req ID | Category | Intent | Legal Status | Name | Subdomain(s) | Context | Conditions | Confidence |
|---|---|---|---|---|---|---|---|---|
| #Q001 | prohibition | health | mandatory | Pesticide Application Restriction | agricultural water | Dispensers must not sell and applicators must not use pesticides for purposes other than those described on the label unless authorization from provincial authorities is obtained. | Pesticide use | high |
| #Q002 | prohibition | health | mandatory | Pesticide Label Specification | agricultural water | Injection of a pesticide into an irrigation system is allowed only if this method of application is specified on the label. | Pesticide injection into irrigation systems | high |
| #Q003 | monitoring | health | recommended | Backflow Prevention Device Testing Frequency | agricultural water | Backflow prevention devices should be tested upon installation and once every year after that. | high | |
| #Q004 | administrative | health | mandatory | Backflow Device Tester Certification | agricultural water | The device must be tested by a certified tester who is familiar with the design and intended operation of the device. | Device testing | high |
| #Q005 | operational | operational | mandatory | Runoff and Leaching Prevention | agricultural water | Chemigation systems must be operated within the limits of the soil types present to reduce the potential for runoff and for leaching. | high | |
| #Q006 | design | operational | mandatory | Runoff Prevention Design | agricultural water | Irrigation systems applying chemicals must be designed and operated to prevent any runoff from occurring. | high | |
| #Q007 | design | health | mandatory | Chemigation Safety Equipment | agricultural water | All chemigation systems must have appropriate safety equipment installed to prevent backflow to potable water supplies. | high | |
| #Q008 | design | operational | mandatory | Sprinkler Lateral Pressure Variation | agricultural water | The maximum pressure variation along the lateral must not exceed 20% of the sprinkler operating pressure. Flow control nozzles must be used if pressure fluctuations exceed the 20% allowance. | Sprinkler systems | high |
| #Q009 | operational | operational | mandatory | Sprinkler Head Rotation | agricultural water | The sprinkler head must rotate a minimum of two times per minute. | Sprinkler systems | high |
| #Q010 | operational | operational | mandatory | Sprinkler Operating Duration | agricultural water | Sprinkler irrigation systems must be operated for at least 15 minutes to achieve uniform application. | Sprinkler systems | high |
| #Q011 | design | operational | mandatory | Trickle System Injection Location | agricultural water | The injection system must be located before the filtration system so that any precipitates that may form will have an opportunity to be filtered out before entering the irrigation system. | Trickle systems | high |
| #Q012 | operational | operational | mandatory | System Flushing Duration | agricultural water | The irrigation system must be operated long enough to clear all lines of the chemical being applied. | After chemigation is complete | high |
| #Q013 | design | health | mandatory | Backflow Prevention Device Selection | agricultural water | Chemigation systems must use either a double check valve assembly or a reduced pressure backflow device, depending on the water source. | high | |
| #Q014 | monitoring | health | mandatory | Pre-Season Device Inspection | agricultural water | Before the first irrigation application of the season, the owner or operator must have the backflow prevention device inspected by a Certified Tester to ensure that it is an approved device, installed correctly and in proper operating condition. | Prior to first irrigation application of the season | high |
| #Q015 | reporting | reporting | recommended | Test Report Submission | agricultural water | A copy of the test report should be provided to the Water Authority within 30 days of completion of the test and before operation of the chemical injection system. | high | |
| #Q016 | reporting | reporting | mandatory | Initial Installation Certification | agricultural water | The owner or operator must provide to the Water Authority upon initial installation of the backflow prevention device a certificate showing: date of installation, type, model and size of backflow prevention device installed, copy of the Certified Tester's inspection certificate | Upon initial installation of the device | high |
| #Q017 | prohibition | health | mandatory | Prohibition of AVB with Continuous Pressure | agricultural water | An AVB must not be used where continuous operating pressure is applied for more than 12 hours in any 24-hour period as the relief valve may stick in the closed position and cause malfunctioning. | Continuous operating pressure applied for >12 hours in 24h | high |
| #Q018 | design | health | mandatory | DCVA Installation Location | agricultural water | The DCVA must be installed upstream of the chemical injection system at a location that is readily accessible for testing purposes. | Double Check Valve Assembly installation | high |
| #Q019 | design | operational | mandatory | Above Ground Installation Preference for DCVA | agricultural water | Wherever possible the DCVA shall be installed above ground with adequate space to simplify maintenance and testing. | Double Check Valve Assembly installation | medium |
| #Q020 | operational | operational | mandatory | DCVA Winterization | agricultural water | The DCVA must be drained in the fall and protected from freezing. | Fall/Winter preparations | high |
| #Q021 | prohibition | health | mandatory | Label Application Method Compliance | agricultural water | The product label must clearly specify that the product can be applied through an irrigation system. Applying a product through an irrigation system that does not have this method of application specified on the label is an offense under the Pesticide Control Act. | Pesticide, herbicide, or insecticide application | high |
| #Q022 | prohibition | health | mandatory | Prohibition on Chemical Mixing | agricultural water | Pesticides, herbicides, insecticides, fertilizers or surfactants when applied through an irrigation system cannot be mixed or combined with other products. | high | |
| #Q023 | design | operational | mandatory | Acceptable Pump Systems for Pesticides | agricultural water | Only positive displacement pumps or venturi injection systems that are compatible with the chemical to be injected can be used for these products. | Pesticides, herbicides, and insecticides | high |
| #Q024 | prohibition | health | mandatory | Post-Chemigation Irrigation Restriction | agricultural water | Irrigation must not be carried out for at least 24 hrs after chemigation has been completed. | Following application of pesticides, herbicides, or insecticides | high |
| #Q025 | prohibition | health | mandatory | Proximity to Water/Dwelling Restriction | agricultural water | Application of these chemicals through an irrigation system cannot occur if the target area is within 30 metres of a residential dwelling, park, playground, stream, river, or lake. | Application of pesticides, herbicides, or insecticides | high |
| #Q026 | operational | operational | mandatory | Knowledgeable Person Attendance | agricultural water | A person knowledgeable of the irrigation system and responsible for its operation must be present during the treatment application to stop pesticide injection and make necessary adjustments should the need arise. | During application of pesticide or insecticide | high |
| #Q027 | prohibition | health | mandatory | Prohibition of Suction Side Injection | agricultural water | Injection on the suction side of the irrigation pump is prohibited. | high | |
| #Q028 | design | health | mandatory | Injector Location Requirements | agricultural water | The injector must be located on the discharge side of the irrigation pump downstream of the backflow preventer. | high | |
| #Q029 | design | health | mandatory | Chemical Injection Line Check Valve | agricultural water | The chemical injection line must contain a functional, automatic quick closing check valve to prevent the flow of water from the irrigation system back through the injector into the chemical storage tank. | high | |
| #Q030 | design | health | mandatory | Pump Control Interlocking | agricultural water | If an electric irrigation pump is used on the irrigation system and an electric positive displacement pump is used to inject the chemicals, the controls for the injector and irrigation pump must be functionally interlocked to automatically stop chemical injection when the irrigation pump shuts down. | Using an electric irrigation pump and electric positive displacement injection pump | high |
| #Q031 | design | health | mandatory | Self-Contained Pond Protection | agricultural water | If the water source is a self contained pond or reservoir, a 50-cm air gap must be maintained between the maximum water surface elevation of the pond and the pipeline used to fill the pond. If the air gap cannot be maintained, then a Double Check Valve Assembly must be installed according to the procedures shown in Section 4.2. | Pumping from self contained pond or reservoir | high |
| #Q032 | design | health | mandatory | Irrigation Pump Safety Devices | agricultural water | The irrigation pump discharge line must contain a functional quick closing check valve and a vacuum breaker and drain located between the pump and check valve to prevent the backflow of treated irrigation water into the pond or reservoir. | Pumping from self contained pond or reservoir | high |
| #Q033 | design | operational | mandatory | Pressure Switch Requirement | agricultural water | The irrigation pumping system must contain a functional pressure switch that will shut down the irrigation pump should the system pressure reach a point where chemical distribution is adversely affected. | General pumping systems | high |
| #Q034 | design | health | mandatory | Natural Watercourse Backflow Device | agricultural water | If the irrigation system is pumping directly from a canal, drainage or irrigation supply ditch, lake, stream or other natural watercourse an approved Double Check Valve Assembly Backflow Prevention Device must be installed on the irrigation mainline between the irrigation pump and the injection system. | Pumping from stream, lake, or natural watercourse | high |
| #Q035 | design | health | mandatory | Well Groundwater Backflow Device | agricultural water | An irrigation system drawing from groundwater must install an approved Reduced Pressure Principle Backflow Device between the irrigation pump and the chemical injector. | Pumping from wells/groundwater | high |
| #Q036 | design | health | mandatory | Irrigation District Mainline Protection | agricultural water | If the irrigation system is pumping from an irrigation district or other water purveyor mainline an approved Reduced Pressure Principle Backflow Device must be installed between the water authority's mainline and the irrigation pump. | Pumping from irrigation district or water authority | high |
| #Q037 | design | health | mandatory | Gravity Feed System Protection | agricultural water | If the gravity feed irrigation system also functions as a potable water source, then injection must take place downstream from the potable connection and a DCVA must be installed between the injector and the potable water connection on the water supply mainline. | Gravity feed systems functioning as potable water sources | high |
| #Q038 | operational | health | recommended | Protective Equipment Requirement | agricultural water | Wear rubber boots, gloves and other appropriate protective equipment at the injection site. | high | |
| #Q039 | operational | health | recommended | Separate Injection System for Insecticides | agricultural water | Use a separate injection system to apply insecticides from that used to apply fertilizers. | high | |
| #Q040 | administrative | health | recommended | Sign Posting for Non-Potable Water | agricultural water | The orchard should be posted with signs warning that the water cannot be consumed if fertigation or any other form of chemigation is done. | high | |
| #Q041 | prohibition | health | mandatory | Herbicide and Nematicide Mixing Prohibition | agricultural water | Herbicides and nematicides should never be mixed with any other chemical when injected into an irrigation system. | high | |
| #Q042 | operational | health | mandatory | Pesticide Application Guidelines Adherence | agricultural water | Irrigators must always follow the guidelines shown on the label before applying any pesticide. | Pesticide application | high |
| #Q043 | operational | operational | mandatory | Center Pivot End-Revolution Shutoff | agricultural water | The injection equipment must be shut off after one revolution but the irrigation system should continue to operate until the product has been cleared from the system. | Center pivot systems | high |
| #Q044 | reporting | reporting | mandatory | Notification of Intent to Inject | agricultural water | The owner or operator of any Private Water System wishing to inject or introduce chemicals or foreign material into the water system must notify the Water Authority in writing of their intentions to do so. | Private water systems under Cross Connection Control By-Law | high |
| #Q045 | administrative | reporting | mandatory | Pesticide Import Permit Requirement | other | It is illegal to import a pesticide unless it is registered in Canada and an import permit is obtained. | Importing pesticides | high |
| #Q046 | administrative | operational | mandatory | Surface Water Licence Requirement | agricultural water | A water licence must be obtained before taking any water from a surface water source. | Extraction of water from surface sources | high |
| #Q047 | prohibition | operational | mandatory | Nozzle Sizing Prohibition for Pressure Compensation | agricultural water | For chemigation systems, varying the nozzle size along a lateral to accommodate pressure fluctuations is not an acceptable method of rectifying this problem. | Chemigation system design for topography | high |
| #Q048 | operational | health | mandatory | Wind Speed Limit for Pesticide Application | agricultural water | Wind conditions must be less than 2 km/hr during the entire time of application to prevent drift off the target area. | Pesticide application through irrigation systems | high |
| #Q049 | design | health | mandatory | Foot Valve Requirement for Pumping Systems | agricultural water | In addition to the Reduced Pressure Principle Backflow Device the pumping system must have a foot valve at the bottom of the intake line to prevent the discharge column from draining back into the water source. | Pumping systems drawing from groundwater/wells | high |
| Req ID | Category | Intent | Legal Status | Name | Subdomain(s) | Limit Type | Limit Value | Context | Conditions | Confidence |
|---|---|---|---|---|---|---|---|---|---|---|
| #P001 | design | operational | mandatory | maximum pressure variation along the lateral | agricultural water | requirement | <= 20 % | The maximum pressure variation along the lateral must not exceed 20% of the sprinkler operating pressure. | Sprinkler systems | high |
| #P002 | design | operational | recommended | sprinkler spacing along the lateral | agricultural water | requirement | <= 50 % | The sprinkler spacing along the lateral should not exceed 50% of the wetted diameter. | Sprinkler systems | high |
| #P003 | design | operational | recommended | spacing between laterals | agricultural water | requirement | <= 60 % | The spacing between laterals should not exceed 60% of the sprinkler wetted diameter. | Sprinkler systems | high |
| #P004 | design | operational | mandatory | sprinkler head rotation | agricultural water | requirement | >= 2 times per minute | The sprinkler head must rotate a minimum of two times per minute. | Sprinkler systems | high |
| #P005 | design | operational | recommended | emitter variance coefficient | agricultural water | requirement | < 0.05 unitless | An emitter with a manufacturer's variance coefficient of less than 0.05 should be selected. | Trickle systems | high |
| #P006 | operational | operational | recommended | Emitter operating pressure range variation | agricultural water | requirement | <= 10 % | Emitter operating pressure range should be kept within +/- 10% of the emitter operating pressure. | Trickle systems | high |
| #P007 | design | operational | mandatory | AVB installation height | agricultural water | requirement | >= 15 cm | The AVB must be installed downstream of the last shutoff valve... and a minimum of 15 cm (6 inches) above the highest outlet on the non-potable system. | Atmospheric vacuum breaker installation | high |
| #P008 | operational | operational | mandatory | AVB continuous operating pressure duration | agricultural water | requirement | <= 12 hours | An AVB must not be used where continuous operating pressure is applied for more than 12 hours in any 24-hour period | Atmospheric vacuum breaker continuous use | high |
| #P009 | design | operational | mandatory | PVB installation height | agricultural water | requirement | >= 30 cm | A PVB must be installed 30 cm (12 inches) above the highest outlet on the non-potable water system. | Pressure vacuum breaker installation | high |
| #P010 | operational | health | mandatory | Distance from residential dwelling, park, playground, stream, river, or lake | agricultural water | requirement | >= 30 metres | Application of these chemicals through an irrigation system cannot occur if the target area is within 30 metres of a residential dwelling, park, playground, stream, river, or lake. | Application of pesticides, herbicides, and insecticides | high |
| #P011 | operational | operational | mandatory | Wind conditions | agricultural water | requirement | < 2 km/hr | Wind conditions must be less than 2 km/hr during the entire time of application to prevent drift off the target area. | Pesticide application | high |
| #P012 | operational | health | mandatory | post-chemigation irrigation delay | agricultural water | requirement | >= 24 hrs | Irrigation must not be carried out for at least 24 hrs after chemigation has been completed. | Pesticide, herbicide, or insecticide chemigation | high |
| #P013 | design | health | mandatory | air gap | agricultural water | requirement | >= 50 cm | a 50-cm air gap must be maintained between the maximum water surface elevation of the pond and the pipeline used to fill the pond. | Pumping from a self-contained pond or reservoir | high |
| #P014 | chemical | treatment | recommended | fertilizer concentration in irrigation water | agricultural water | requirement | <= 5 % | To avoid damage to plant roots from high fertilizer concentrations, fertilizer concentration in the irrigation water should not exceed 5%. | Fertilizer application | high |
| #P015 | design | health | mandatory | air gap for sprayer tank filling station | agricultural water | requirement | >= 30 cm | The owner or operator of any sprayer tank filling station shall maintain a minimum air gap of 30 cm between the end of the filler hose and the top of the sprayer tank. | Sprayer tank filling station cross connection control | high |
| #P016 | operational | health | mandatory | backflow prevention testing frequency | agricultural water | requirement | 1 year | Backflow prevention devices should be tested upon installation and once every year after that. | All installed backflow prevention devices | high |
| #P017 | operational | reporting | mandatory | test report submission deadline | agricultural water | requirement | <= 30 days | A copy of the test report shall be provided to the Water Authority within 30 days of completion of the test | After inspection by a Certified Tester | high |
| #P018 | design | operational | mandatory | minimum coefficient of uniformity for sprinkler systems | agricultural water | requirement | >= 80 % | sprinkler irrigation systems used to apply chemicals must be designed and operated to achieve a minimum coefficient of uniformity of 80% | Chemigation via sprinkler system | high |
| #P019 | design | health | mandatory | gravity feed backflow prevention elevation threshold | agricultural water | requirement | > 10 m | elevation difference between the irrigation intake and the chemical injector exceeds 10 m, need not use a backflow prevention device if a venturi or other passive type of injector is used | Self-contained gravity feed systems | high |
| #P020 | design | operational | recommended | injection pump delivery accuracy | agricultural water | requirement | +/- 1 % | Injection pumps, within the minimum to maximum operating range, should have a delivery accuracy of plus or minus one percent. | Metering pump operation | high |
| #P021 | operational | operational | recommended | system flushing duration | agricultural water | requirement | >= 30 minutes | A flushing time of 30 minutes should be sufficient for most systems | Post-chemigation completion | high |
| #P022 | operational | operational | mandatory | sprinkler system minimum operation duration | agricultural water | requirement | >= 15 minutes | Sprinkler irrigation systems must be operated for at least 15 minutes to achieve uniform application. | Chemigation sets | high |
| #P023 | operational | operational | recommended | post-injection flushing duration for foliage protection | agricultural water | requirement | >= 1 hour | When applying chemicals that may damage the crop foliage, the sprinkler irrigation chemigation system should be operated for at least one hour after chemical injection has ceased. | Foliage-sensitive crops | high |
| #P024 | operational | operational | recommended | calibration container capacity | agricultural water | requirement | >= 5 minutes of injection | The calibration container should be clear, large enough to hold a volume sufficient for five minutes of injection | Calibration of injectors | high |
| #P025 | design | operational | recommended | overhead sprinkler application uniformity | agricultural water | requirement | >= 85 % | Overhead sprinkler systems used for irrigation, frost protection or crop cooling purposes on tree fruits or cranberries... A minimum application uniformity of 85% should be achieved. | Overhead sprinkler systems on tree fruits or cranberries | high |
| #P026 | chemical | treatment | recommended | target fertilizer concentration | agricultural water | treatment_goal | 1-2 % | Generally, fertilizer concentrations of 1-2% in the irrigation water are considered acceptable. | Standard fertigation practice | high |
| #P027 | unknown | unknown | mandatory | maximum non-compliance fine | agricultural water | requirement | <= 2000 Dollars ($) | Any person who disobeys or fails to comply with any provision of this Bylaw shall be guilty of an offence and liable on summary conviction to a fine not exceeding Two Thousand Dollars ($2,000) | Violation of Cross Connection Control By-Law | high |
| #P028 | unknown | unknown | mandatory | maximum imprisonment for non-compliance | agricultural water | requirement | <= 6 months | liable on summary conviction to... imprisonment not exceeding six (6) months | Violation of Cross Connection Control By-Law | high |
| #P029 | unknown | unknown | mandatory | continuing offence daily fine | agricultural water | requirement | <= 500 Dollars ($) | if the offence is of a continuing nature, to a fine not exceeding Five Hundred Dollars ($500) for each day the offence is continued. | Continuing violation of Cross Connection Control By-Law | high |
| #P030 | operational | operational | mandatory | center pivot calibration travel distance | agricultural water | requirement | >= 20 m | marking the end tower's progress with small flags and allowing the system to travel a minimum distance of 20 m. | Center Pivot Calibration | high |
| #P031 | operational | operational | mandatory | traveling gun calibration travel distance | agricultural water | requirement | 10 m | Mark the cart location in the field with a flag and position another flag a distance of 10 m away along the operating lane. | Traveling Gun Calibration | high |
| #P032 | operational | operational | mandatory | water service turn-on fee | agricultural water | requirement | 100 Dollars ($) | Any person whose water has been turned off pursuant to this Bylaw shall not have the water from the Water Authority turned on until such time as... the said person pays to the Water Authority a turn on fee of one hundred dollars ($100) | Payable before re-establishing water service after shut-off for non-compliance with the Cross Connection Control By-Law | high |
| #P033 | design | operational | mandatory | Venturi injector pressure drop | agricultural water | requirement | 20-50 % | To operate effectively, venturi must have a pressure drop of 20-50% of the inlet pressure and are therefore not effective where supply pressures may be low. | Venturi injector operation | high |
| #P034 | operational | operational | recommended | continuous move system chemical concentration | agricultural water | requirement | < 1 % | The concentration of chemical in the irrigation line should be less than 1%. | Center pivot or traveling gun systems | high |
| #P035 | operational | operational | recommended | preferred solid set sprinkler operation duration | agricultural water | requirement | 1 hour | Solid set sprinkler systems should preferably be operated for 1 hour to achieve good application uniformity. | Solid set sprinkler systems | high |
| #P036 | operational | health | mandatory | pesticide application field coverage timeframe | agricultural water | requirement | 1 day | For pesticide or insecticide application the irrigation system must be capable of covering the entire field in one day. | Pesticide or insecticide application | high |
| #P037 | operational | reporting | mandatory | initial backflow assembly installation certificate deadline | agricultural water | requirement | 30 days | The owner or operator will provide to the Water Authority within 30 days of initial installation of the backflow prevention assembly a certificate... | Initial installation of backflow prevention device | high |
| #P038 | design | operational | recommended | pressure differential injection system flow limit guidance | agricultural water | requirement | < 50 gpm | This type of injection system is trouble-free and inexpensive and works well for small systems operating at less than 50 gpm. | Pressure differential injection systems | high |
| #P039 | design | operational | mandatory | Support block requirement for large backflow preventers (DCVA) | agricultural water | requirement | > 2.5 inches | DCVA's larger than 2 1/2" shall have support blocks to prevent damage. | Double Check Valve Assembly installation | high |
| #P040 | design | operational | mandatory | Support block requirement for large backflow preventers (RPBD) | agricultural water | requirement | > 2.5 inches | RPBD's larger than 2 1/2" shall have support blocks to prevent damage. | Reduced Pressure Principle Backflow Prevention Device installation | high |
| Req ID | Category | Name | Context | Confidence |
|---|---|---|---|---|
| #D001 | Chemigation | the practice of applying chemicals to a crop through an irrigation system | high | |
| #D002 | cross connection | any connection or structural arrangement between a potable water system and any non-potable water system or chemical source through which backflow can occur | high | |
| #D003 | Solutions | liquids that have all the plant nutrients in a solution | high | |
| #D004 | Water Authority | includes any municipality, regional district, improvement district, irrigation district, water users community, water works district, water utility and any other corporation that have the authority to supply water for the purposes of irrigation, domestic or other uses. | high | |
| #D005 | Trustee | means the Trustee of the Water Authority or any person authorized by the Trustee to act on their behalf. | high | |
| #D006 | Private Water System | means a water system privately owned or operated for the delivery or distribution of water and includes any domestic use, irrigation system, greenhouse and hydroponic system, and any other use of water supplied by the Water Authority's waterworks system. | high | |
| #D007 | Certified Tester | means a person holding a valid certificate from the British Columbia Water and Waste Association for the purpose of testing and servicing all types of backflow prevention devices. | high | |
| #D008 | Person | includes a corporation, partnership or party and the personal or other legal representative of a person to whom the context can apply according to law and the singular includes the plural and the masculine includes the feminine. | high | |
| #D009 | Cross Connection | means any physical arrangement whereby the Water Authority's water supply is connected, directly or indirectly, with any non-potable or unapproved private water supply system, sewer, drain, conduit, well, pool, storage reservoir, plumbing fixture, or any other device which contains, or may contain, contaminated water, liquid, gases, sewage, or other waste, of unknown or unsafe quality which may be capable of imparting contamination to the public water supply as a result of backflow. | high | |
| #D010 | Backflow | means the reversal of flow from the private water system to the Water Authority's waterworks system. | high | |
| #D011 | Potable Water | means water that is fit for human consumption as defined in the British Columbia Drinking Water Regulation. | high | |
| #D012 | Adsorption | Adhesion in an extremely thin layer of molecules to the surfaces of solid bodies or liquids in which they are in contact. | high | |
| #D013 | Application Efficiency | A ratio of the net amount of water applied to the gross amount delivered by the irrigation system. | high | |
| #D014 | Application Rate | The rate at which irrigation water is applied to the soil in inches per hour. | high | |
| #D015 | Application Uniformity | A measurement of the variance of water application. | high | |
| #D016 | Availability Coefficient | The maximum fraction of available water storage capacity to be removed before irrigation is required. | high | |
| #D017 | Available Water Storage Capacity (AWSC) | The amount of soil water retained between field capacity and the permanent wilting point. | high | |
| #D018 | Backflow | A reversal of the normal direction of flow. | high | |
| #D019 | Backflow preventer | A device or method that prevents backflow of water in a pipeline. | high | |
| #D020 | Backpressure | An occurrence where the irrigation system pressure exceeds the supply pressure of the water purveyor's system. | high | |
| #D021 | Backsiphonage | Backflow caused by atmospheric pressure. | high | |
| #D022 | Cation | A positively charged ion. | high | |
| #D023 | Coefficient of Uniformity | The percentage of deviation from the average application of water from an irrigation system. | high | |
| #D024 | Effective Rooting Depth | That depth in the soil above which the roots obtain 90% or more of their water between irrigations. | high | |
| #D025 | Effective Soil Water Storage Capacity | The amount of water stored in the soil that is available for crop use. | high | |
| #D026 | Evapotranspiration (ET) | The total amount of water transpired by plants and evaporated from the soil surface. | high | |
| #D027 | Hydraulic Gradient | The friction loss that corresponds to water flowing through a section of pipeline, fitting, valve or fixture. | high | |
| #D028 | Ion | An electrically charged particle on the atomic molecular scale. | high | |
| #D029 | Irrigation Interval | The number of days between the start of an irrigation at any one setting and the start of the next irrigation at the same setting. | high | |
| #D030 | Maximum Soil Water Deficit | The maximum amount of water allowed to be removed from the soil before irrigation is required. | high | |
| #D031 | Total Dynamic Head | The energy measured in feet imparted by the pump, and is equal to the sum of static lift, friction head, static discharge head and pressure head. | high | |
| #D032 | Zone | A portion of an irrigation system that is controlled by one valve. | high | |
| #D033 | suspensions | hold part of the plant nutrients suspended in the liquid by a suspending agent. | high | |
| #D034 | solubility | The mass of fertilizer that will dissolve in a specific volume of water is known as solubility. | high | |
| #D035 | grade | These numbers, called grade, represent the amount of nitrogen (N), phosphate (P2O5), and potash (K2O) content of the fertilizer in terms of percentage by weight. | high | |
| #D036 | fertilizer ratio | The fertilizer ratio is the relative proportion of each of the primary nutrients. | high | |
| #D037 | volatility | Volatility is the tendency of a liquid to become a gas and increases as the vapour pressure of the liquid increases. | high | |
| #D038 | constant rate feeders | Constant rate feeders inject at the same discharge rate even if the irrigation system flow rate changes. | high | |
| #D039 | constant ratio feeder | A constant ratio feeder will inject the chemical at a constant ratio in proportion to the irrigation system flow rate. | high | |
| #D040 | Severe | An existing or probable cross connection involving any substance in sufficient concentration to cause death, spread disease or has a high probability of causing such effect. | high | |
| #D041 | Moderate | An existing or probable cross connection involving any substance that has a low probability of becoming a severe hazard but constitutes a nuisance or is aesthetically objectionable if introduced into the water supply. | high | |
| #D042 | Minor | An existing or probable cross connection between a potable water supply line and a tank or other water supply that has a low probability of becoming contaminated. | high | |
| #D043 | calcium carbonate equivalent | The amount of calcium carbonate required to neutralize the acidity produced by a given quantity of fertilizer product is the calcium carbonate equivalent. | high | |
| #D044 | Use | includes the storage, transportation, handling and application of pesticides. | high | |
| #D045 | PCP | Pest Control Products | high | |
| #D046 | AVB | atmospheric vacuum breaker | high | |
| #D047 | PVB | pressure vacuum breaker | high | |
| #D048 | DCVA | double check valve assembly | high | |
| #D049 | RPBD | reduced pressure principle backflow device | high | |
| #D050 | CSA | Canadian Standards Association | high | |
| #D051 | AWWA | American Water Works Association | high | |
| #D052 | ASAE | American Society of Agricultural Engineers | high | |
| #D053 | USC | University of Southern California Foundation of Cross Connection Control and Hydraulic Research | high | |
| #D054 | Backsiphonage | is caused by low pressure or a reduced pressure in the supply piping. | high | |
| #D055 | Backpressure | occurs when the user system is operating at a higher pressure than the potable water supply system. | high | |
| #D056 | Passive injectors | use the energy supplied by the irrigation system or the atmosphere to inject the chemicals. | high | |
| #D057 | Active injectors | use an external energy source or a mechanical moving part to create pressures exceeding the irrigation mainline pressure to inject the chemical. | high |