Daily Surface Inflow Into Lake Calculator

Formula Used:

\[ Daily Surface Inflow = Daily Seepage Outflow + Daily Surface Outflow + Daily Lake Evaporation + Increase in Lake Storage in a Day + Daily Transpiration Loss - Precipitation - Daily Groundwater Inflow \]

\[ V_{is} = V_{og} + V_{os} + E_L + \Delta S_L + T_L - P - V_{ig} \]

Daily Seepage Outflow (Vog):

m³/s

Daily Surface Outflow (Vos):

m³/s

Daily Lake Evaporation (EL):

Increase in Lake Storage (ΔSL):

Daily Transpiration Loss (TL):

Precipitation (P):

Daily Groundwater Inflow (Vig):

m³/s

Daily Surface Inflow (Vis):

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1. What is Daily Surface Inflow?

Daily Surface Inflow refers to the amount of water that flows into a lake or reservoir from surface sources such as rivers, streams, and runoff on a daily basis. It is a critical component in water balance calculations for hydrological systems.

2. How Does the Calculator Work?

The calculator uses the water balance equation:

\[ V_{is} = V_{og} + V_{os} + E_L + \Delta S_L + T_L - P - V_{ig} \]

Where:

\( V_{is} \) — Daily Surface Inflow (m³/s)
\( V_{og} \) — Daily Seepage Outflow (m³/s)
\( V_{os} \) — Daily Surface Outflow (m³/s)
\( E_L \) — Daily Lake Evaporation (m)
\( \Delta S_L \) — Increase in Lake Storage (m)
\( T_L \) — Daily Transpiration Loss (m)
\( P \) — Precipitation (m)
\( V_{ig} \) — Daily Groundwater Inflow (m³/s)

Explanation: This equation accounts for all water inputs and outputs to calculate the net surface inflow into a lake system.

3. Importance of Surface Inflow Calculation

Details: Accurate calculation of daily surface inflow is essential for water resource management, flood prediction, drought monitoring, and maintaining ecological balance in lake systems.

4. Using the Calculator

Tips: Enter all required values in their respective units. Ensure values are positive and within reasonable ranges for accurate calculations.

5. Frequently Asked Questions (FAQ)

Q1: Why is surface inflow important for lake management?
A: Surface inflow determines the water volume entering a lake, affecting water levels, quality, and ecosystem health.

Q2: How does precipitation affect surface inflow?
A: Precipitation directly adds water to the system and is subtracted from the inflow calculation as it represents an external input.

Q3: What is the difference between surface inflow and groundwater inflow?
A: Surface inflow comes from above-ground sources like rivers, while groundwater inflow comes from underground aquifers.

Q4: How often should surface inflow be calculated?
A: For accurate water budgeting, daily calculations are recommended, though frequency may vary based on specific monitoring needs.

Q5: What factors can affect the accuracy of surface inflow calculations?
A: Measurement errors, unaccounted water losses, evaporation rate variations, and changing weather conditions can affect accuracy.