TCEQ IRRIGATION LICENSE STUDY GUIDE GRADED A+

BPA requirements for fertilizer injection system - Answer-Reduced Pressure Principle Assembly (RPPA) (RPZ) is required when fertilizer injection are being used. Causes backsiphonage? - Answer-Caused by a negative or Sub-atmospheric pressure. Example-City departments are using fire hydrant or there's a city main line break, or someone sucking liquid from a glass using a straw. Causes of leaking check valve - Answer-Debris-can enter the valve. (Can use Y strainer to provide a solution.) Definition of high-hazard system? - Answer-Non-potable water, chemicals, fertilizers Definition of cross-connection? - Answer-Any actual or potential connection between a potable water supply and any source of contamination or pollution. Degree of hazard - Answer-A measure of the degree of risk or harm to the public's health. General installation requirements of BPA - Answer-Device must check/pass Back-siphonage, Backpressure, constant pressure, non-health hazard, health hazard. Installation requirements of AVB - Answer--Installed 6" above the highest head or outlet in the system. -No Valves -Downstream. -Installed vertically. Installation and inspection requirements for public water system to BPA - Answerinstallation requirements of PVB - Answer-12" above the highest sprinkler head Vertically installedInstallation requirments of RPZ - Answer-12" above ground Installation requirements of DCV - Answer-Horizontal or Vertical above or below ground. Limits of Double check valve - Answer-Is a high hazard/health hazard * Limits of AVB - Answer-Can not handle more than 12 hours of constant pressure, not approved by the state of Texas, does not protect against back-pressure. purpose of test cocks on DCV - Answer-to test check valves and flush purpose of shut off-valves on PVB - Answer-To test and winterize Required back flow prevention system for booster pump - Answer-RPZ to prevent constant back flow Required of air gap - Answer-2x times the diameter of the pipe Testing requirment for BPA - Answer-Needs and frequency low-hazard - upon installation high Maintenance What are the two types of back-flow? - Answer-Back pressure and Back siphonage characteristics of looped irrigation main lines - Answer-1/2 flow gym by 1/2 pipe > low pressure, loss downsize pipe, both at the same time. characteristics of flow vs pressure for given pipe size - Answer-as flow increases pressure decreases velocity increases Characteristics of water - Answer-non compress-able, potable, non potableCommon units of measure for flow rate in landscape irrigation - Answer-(GPM, gallons per minute) (GPH,Gallons per hour), (IPH, Inches per hour) Conversion of psi to feet (head) of water - Answer-1' = .433 PSI 2.31'= 1 PSI Definition of design pressure - Answer-Water in motion