Q90 definition

Q90 means the amount of flow in a stream that was equaled or exceeded by the annual daily mean stream flow ninety percent (90%) of the time.
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Examples of Q90 in a sentence

  • For each assessment year, a set of three effluent flow rates, Q10, Q50 and Q90 were used, all based on the percentile of occurrence.

  • Based on the EEFS, the Q10 was representative of the flow rates that occurred between the 0 and 20 percentile (20 percent) and the Q90 was representative of the flow rates that occurred between the 80 and 100 percentile (20 percent) whereas the Q50 was representative of the remaining 60 percent.

  • Table 15 Trends WBC Present Situation B&H Croatia Macedonia Montenegro Slovenia Serbia WBC Q90 Organic farming will spread in all WBC countries.

  • The Q90 flow rate was calculated using a Q90 to Q50 ratio of 1.28.

Related to Q90

  • CLIA means the Clinical Laboratory Improvement Amendments (CLIA) of 1988, as amended from time to time, and the rules, regulations, guidelines, guidance documents and compliance policy guides issued or promulgated thereunder.

  • HITECH means the Health Information Technology for Economic and Clinical Health Act.

  • National Environmental Management Act means the National Environmental Management Act, 1998 (Act No. 107 of 1998);

  • Material safety data sheet or "MSDS" means the chemical, physical, technical, and safety information document supplied by the manufacturer of the coating, solvent, or other chemical product, usually through the distribution network or retailers.

  • type-approval means the procedure whereby an approval authority certifies that a type of vehicle, system, component or separate technical unit satisfies the relevant administrative provisions and technical requirements;