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Total Direct Runoff Depth Formula

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Total Direct Runoff is the runoff entering stream channels promptly after rainfall or snowmelt. Check FAQs

R d = P - (φ \cdot t e)

R_d - Total Direct Runoff?P - Total Storm Precipitation?φ - Φ-Index?t_e - Duration of Rainfall Excess?

Total Direct Runoff Depth Example

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Here is how the Total Direct Runoff Depth equation looks like with Values.

Here is how the Total Direct Runoff Depth equation looks like with Units.

Here is how the Total Direct Runoff Depth equation looks like.

117.8884 = 118 - (0.0279 \cdot 4)

117.8884cm = 118cm - (0.0279 \cdot 4h)

117.8884 = 118 - (0.0279 \cdot 4)

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Total Direct Runoff Depth Solution

Follow our step by step solution on how to calculate Total Direct Runoff Depth?

FIRST Step Consider the formula

R d = P - (φ \cdot t e)

Next Step Substitute values of Variables

∴

R d = 118cm - (0.0279 \cdot 4h)

Next Step Prepare to Evaluate

∴

R d = 118 - (0.0279 \cdot 4)

Next Step Evaluate

∴

R d = 1.178884m

LAST Step Convert to Output's Unit

∴

R d = 117.8884cm

Total Direct Runoff Depth Formula Elements

Variables

Total Direct Runoff

Total Direct Runoff is the runoff entering stream channels promptly after rainfall or snowmelt.

Symbol: R_d

Measurement: LengthUnit: cm

Note: Value should be greater than 0.

Formulas to find Total Direct Runoff

Total Storm Precipitation

Total Storm Precipitation is the annual precipitation of the current year.

Symbol: P

Measurement: LengthUnit: cm

Note: Value should be greater than 0.

Formulas to find Total Storm Precipitation

Φ-Index

Φ-Index of a catchment is the constant infiltration capacity that would yield the actual total runoff for a given rainfall amount.

Symbol: φ

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Φ-Index

Duration of Rainfall Excess

Duration of Rainfall Excess is the total time in which the rainfall intensity the greater than the average rate of infiltration (in hours).

Symbol: t_e

Measurement: TimeUnit: h

Note: Value should be greater than 0.

Formulas to find Duration of Rainfall Excess

Other formulas in Φ Index category

Go Duration of Rainfall from Rainfall Hyetograph

D = N \cdot Δt

Go Time Interval of Rainfall Hyetograph

Δt = \frac{D}{N}

Go Pulses of Time Interval from Rainfall Hyetograph

N = \frac{D}{Δt}

Go Precipitation given Total Runoff Depth for Practical Use

P = R d + (φ \cdot t e)

How to Evaluate Total Direct Runoff Depth?

Total Direct Runoff Depth evaluator uses Total Direct Runoff = Total Storm Precipitation-(Φ-Index*Duration of Rainfall Excess) to evaluate the Total Direct Runoff, The Total Direct Runoff Depth formula is defined as the measuring point in the receiving water results in the arithmetical mean of the values of the total runoff depth of all area units in the related catchment area. Total Direct Runoff is denoted by R_d symbol.

How to evaluate Total Direct Runoff Depth using this online evaluator? To use this online evaluator for Total Direct Runoff Depth, enter Total Storm Precipitation (P), Φ-Index (φ) & Duration of Rainfall Excess (t_e) and hit the calculate button.

FAQs on Total Direct Runoff Depth

What is the formula to find Total Direct Runoff Depth?

The formula of Total Direct Runoff Depth is expressed as Total Direct Runoff = Total Storm Precipitation-(Φ-Index*Duration of Rainfall Excess). Here is an example- 11788.84 = 1.18-(0.0279*14400).

How to calculate Total Direct Runoff Depth?

With Total Storm Precipitation (P), Φ-Index (φ) & Duration of Rainfall Excess (t_e) we can find Total Direct Runoff Depth using the formula - Total Direct Runoff = Total Storm Precipitation-(Φ-Index*Duration of Rainfall Excess).

Can the Total Direct Runoff Depth be negative?

No, the Total Direct Runoff Depth, measured in Length cannot be negative.

Which unit is used to measure Total Direct Runoff Depth?

Total Direct Runoff Depth is usually measured using the Centimeter[cm] for Length. Meter[cm], Millimeter[cm], Kilometer[cm] are the few other units in which Total Direct Runoff Depth can be measured.

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Total Direct Runoff Depth Formula

Total Direct Runoff Depth Example

Total Direct Runoff Depth Solution

Total Direct Runoff Depth Formula Elements

Other formulas in Φ Index category

How to Evaluate Total Direct Runoff Depth?

FAQs on Total Direct Runoff Depth

Variable Name