Change In Soil Moisture Storage Given Runoff Calculator

Change In Soil Moisture Storage Formula:

\[ \Delta Sm = P_{mm} - QV - E_{et} \]

Precipitation (Pmm):

Millimeter

Runoff Volume (QV):

Cubic Meter

Actual Evapotranspiration (Eet):

Cubic Meter per Second

Change In Soil Moisture Storage (ΔSm):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Change In Soil Moisture Storage?

Change In Soil Moisture Storage (ΔSm) represents the variation in the amount of water stored in the soil within a catchment area over a specific period. It is a crucial parameter in hydrology and water budget calculations.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \Delta Sm = P_{mm} - QV - E_{et} \]

Where:

\( \Delta Sm \) — Change in Soil Moisture Storage (Cubic Meter)
\( P_{mm} \) — Precipitation (Millimeter)
\( QV \) — Runoff Volume (Cubic Meter)
\( E_{et} \) — Actual Evapotranspiration (Cubic Meter per Second)

Explanation: The equation calculates the net change in soil moisture by subtracting runoff volume and actual evapotranspiration from the total precipitation.

3. Importance of Soil Moisture Storage Calculation

Details: Accurate calculation of change in soil moisture storage is essential for water resource management, agricultural planning, flood prediction, and understanding the hydrological cycle.

4. Using the Calculator

Tips: Enter precipitation in millimeters, runoff volume in cubic meters, and actual evapotranspiration in cubic meters per second. All values must be non-negative.

5. Frequently Asked Questions (FAQ)

Q1: What factors affect soil moisture storage?
A: Soil type, vegetation cover, climate conditions, and land use practices significantly influence soil moisture storage capacity and changes.

Q2: How often should soil moisture measurements be taken?
A: Measurement frequency depends on the purpose, but typically daily or weekly measurements are taken for agricultural and hydrological studies.

Q3: Can this calculator be used for large catchment areas?
A: Yes, the formula applies to catchment areas of various sizes, though unit consistency must be maintained across all inputs.

Q4: What are typical values for change in soil moisture storage?
A: Values vary widely based on climate, season, and soil characteristics, ranging from negative values (drying) to positive values (wetting).

Q5: How does evapotranspiration affect soil moisture?
A: Evapotranspiration removes water from the soil through evaporation and plant transpiration, reducing soil moisture content.