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  2. Water balance - Wikipedia

    en.wikipedia.org/wiki/Water_balance

    [2] [3] In hydrology, a water balance equation can be used to describe the flow of water in and out of a system. A system can be one of several hydrological or water domains, such as a column of soil, a drainage basin, an irrigation area or a city. The water balance is also referred to as a water budget. Developing water budgets is a ...

  3. Drainage equation - Wikipedia

    en.wikipedia.org/wiki/Drainage_equation

    d = equivalent depth, a function of L, (Di-Dd), and r; r = drain radius (m) Steady (equilibrium) state condition In steady state, the level of the water table remains constant and the discharge rate (Q) equals the rate of groundwater recharge (R), i.e. the amount of water entering the groundwater through the watertable per unit of

  4. Runoff model (reservoir) - Wikipedia

    en.wikipedia.org/wiki/Runoff_model_(reservoir)

    Contrary to the linear reservoir, the non linear reservoir has a reaction factor A that is not a constant, [3] but it is a function of S or Q (figure 2, 3). Normally A increases with Q and S because the higher the water level is the higher the discharge capacity becomes. The factor is therefore called Aq instead of A.

  5. Hazen–Williams equation - Wikipedia

    en.wikipedia.org/wiki/Hazen–Williams_equation

    The Hazen–Williams equation is an empirical relationship that relates the flow of water in a pipe with the physical properties of the pipe and the pressure drop caused by friction. It is used in the design of water pipe systems [1] such as fire sprinkler systems, [2] water supply networks, and irrigation systems.

  6. Utility bill audit - Wikipedia

    en.wikipedia.org/wiki/Utility_Bill_Audit

    A utility bill audit is a comprehensive review of an organization's utility invoices to include Electric, Gas, Water/Sewer and Waste invoices in order to track billing errors and evaluate rate plans to make suggestions for further savings. [1] This is separate from an energy audit which seeks to minimize energy spending through increased ...

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    You've Got Mail!® Millions of people around the world use AOL Mail, and there are times you'll have questions about using it or want to learn more about its features. That's why AOL Mail Help is here with articles, FAQs, tutorials, our AOL virtual chat assistant and live agent support options to get your questions answered.

  9. Parshall flume - Wikipedia

    en.wikipedia.org/wiki/Parshall_flume

    Only the upstream depth needs to be measured to calculate the flow rate. A free flow also induces a hydraulic jump downstream of the flume. Submerged flow occurs when the water surface downstream of the flume is high enough to restrict flow through a flume, submerged flume conditions exist. A backwater buildup effect occurs in a submerged flume.