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  2. Water balance - Wikipedia

    en.wikipedia.org/wiki/Water_balance

    The law of water balance states that the inflows to any water system or area is equal to its outflows plus change in storage during a time interval. [ 2 ] [ 3 ] In hydrology , a water balance equation can be used to describe the flow of water in and out of a system.

  3. Runoff model (reservoir) - Wikipedia

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

    continuity or water balance equation: = +, with units [L/T] where: Q is the runoff or discharge R is the effective rainfall or rainfall excess or recharge A is the constant reaction factor or response factor with unit [1/T] S is the water storage with unit [L] dS is a differential or small increment of S

  4. Evapotranspiration - Wikipedia

    en.wikipedia.org/wiki/Evapotranspiration

    The water balance equation relates the change in water stored within the basin (S) to its input and outputs: = In the equation, the change in water stored within the basin (ΔS) is related to precipitation (P) (water going into the basin), and evapotranspiration (ET), streamflow (Q), and groundwater recharge (D) (water leaving the basin). By ...

  5. Agricultural hydrology - Wikipedia

    en.wikipedia.org/wiki/Agricultural_hydrology

    Likewise the safe yield of wells, extracting water from the aquifer without overexploitation, can be determined using the geohydrologic water balance or the overall water balance, as defined in the section "Combined balances", depending on the availability of data on the water balance components.

  6. Water cycle - Wikipedia

    en.wikipedia.org/wiki/Water_cycle

    The diagram also shows how human water use impacts where water is stored and how it moves. [1] The water cycle (or hydrologic cycle or hydrological cycle) is a biogeochemical cycle that involves the continuous movement of water on, above and below the surface of the Earth. The mass of water on Earth remains fairly constant over time.

  7. The system that moves water around the Earth is off balance ...

    www.aol.com/global-water-cycle-off-balance...

    “For the first time in human history, we are pushing the global water cycle out of balance,” said Johan Rockström, co-chair of the Global Commission on the Economics of Water and a report author.

  8. Drainage density - Wikipedia

    en.wikipedia.org/wiki/Drainage_density

    These two equations agree with each other and follow the water balance equation. According to the equations, a basin with high drainage density, the contribution of surface runoff to stream discharge will be high, while that from baseflow will be low.

  9. Standard step method - Wikipedia

    en.wikipedia.org/wiki/Standard_Step_Method

    The resulting energy equation is shown below: = + + Equation 1. For a given flow rate and channel geometry, there is a relationship between flow depth and total energy. This is illustrated below in the plot of energy vs. flow depth, widely known as an E-y diagram.

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