Duration of Rainfall Excess Calculator

✖Lag Time of a 1-h Unit Hydrograph is the time interval from the midpoint of the rainfall excess to the peak.ⓘ Lag Time of a 1-h Unit Hydrograph [T_p1]

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✖Duration of Excess Rainfall in Hours is time during which continuous rain is observed at a given point or within a given area or Excess Rainfall of the Unit Hydrograph used in deriving the S-curve.ⓘ Duration of Rainfall Excess [D]

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Formula

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Duration of Rainfall Excess

Formula

`"D" = 1.1*"T"_{"p1"}`

Example

`"29.128h"=1.1*"26.48h"`

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Duration of Rainfall Excess Solution

STEP 0: Pre-Calculation Summary

Formula Used

Duration of Excess Rainfall in Hours = 1.1*Lag Time of a 1-h Unit Hydrograph
D = 1.1*T_p1
This formula uses 2 Variables

Variables Used

Duration of Excess Rainfall in Hours - (Measured in Second) - Duration of Excess Rainfall in Hours is time during which continuous rain is observed at a given point or within a given area or Excess Rainfall of the Unit Hydrograph used in deriving the S-curve.
Lag Time of a 1-h Unit Hydrograph - (Measured in Second) - Lag Time of a 1-h Unit Hydrograph is the time interval from the midpoint of the rainfall excess to the peak.

STEP 1: Convert Input(s) to Base Unit

Lag Time of a 1-h Unit Hydrograph: 26.48 Hour --> 95328 Second (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

D = 1.1*T_p1 --> 1.1*95328

Evaluating ... ...

D = 104860.8

STEP 3: Convert Result to Output's Unit

104860.8 Second -->29.128 Hour (Check conversion here)

FINAL ANSWER

29.128 Hour <-- Duration of Excess Rainfall in Hours

(Calculation completed in 00.020 seconds)

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Created by Mithila Muthamma PA

Coorg Institute of Technology (CIT), Coorg

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NSS College of Engineering (NSSCE), Palakkad

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< 10+ The Indian Practice Calculators

Peak Discharge of D-h Unit Hydrograph given Lag Time

Go Peak discharge of a D-h Unit hydrograph = (Area of Catchment)*(1.56/Lag Time of a 1-h Unit Hydrograph)^(1/0.9)

Catchment Area given Lag Time of 1-h Unit Hydrograph

Go Area of Catchment = Peak discharge of a D-h Unit hydrograph*(Lag Time of a 1-h Unit Hydrograph/1.56)^(1/0.9)

Lag Time of 1-h Unit Hydrograph

Go Lag Time of a 1-h Unit Hydrograph = 1.56/((Peak discharge of a D-h Unit hydrograph/Area of Catchment)^0.9)

Catchment Area for Peak Discharge of Weighted Mean Slope Lesser than 0.0028

Go Area of Catchment = (Peak discharge of a D-h Unit hydrograph/(37.4*Weighted Mean Slope^(2/3)))^(4/3)

Weighted Mean Slope given Peak Discharge of D-h Unit Hydrograph

Go Weighted Mean Slope = (Peak discharge of a D-h Unit hydrograph/(37.4*Area of Catchment^(3/4)))^(3/2)

Peak Discharge of D-h Unit Hydrograph for Weighted Mean Slope Lesser than 0.0028

Go Peak discharge of a D-h Unit hydrograph = 37.4*Area of Catchment^(3/4)*Weighted Mean Slope^(2/3)

Lag Time of 1-h Unit Hydrograph given Duration of Rainfall Excess

Go Lag Time of a 1-h Unit Hydrograph = Duration of Excess Rainfall in Hours/1.1

Duration of Rainfall Excess

Go Duration of Excess Rainfall in Hours = 1.1*Lag Time of a 1-h Unit Hydrograph

Catchment Area given Peak Discharge of D-h Unit Hydrograph

Go Area of Catchment = (Peak discharge of a D-h Unit hydrograph/1.79)^(4/3)

Peak Discharge of D-h Unit Hydrograph

Go Peak discharge of a D-h Unit hydrograph = 1.79*Area of Catchment^(3/4)

Duration of Rainfall Excess Formula

Duration of Excess Rainfall in Hours = 1.1*Lag Time of a 1-h Unit Hydrograph
D = 1.1*T_p1

What is Total Runoff?

The Total Runoff is equal to the total precipitation less the losses caused by evapotranspiration (loss to the atmosphere from soil surfaces and plant leaves), storage (as in temporary ponds), and other such abstractions.

What is Effective Rainfall?

Effective Rainfall (or precipitation) is equal to the difference between total rainfall and actual evapotranspiration. At ground level, water from effective rainfall is split into two fractions: surface run-off and infiltration.

How to Calculate Duration of Rainfall Excess?

Duration of Rainfall Excess calculator uses Duration of Excess Rainfall in Hours = 1.1*Lag Time of a 1-h Unit Hydrograph to calculate the Duration of Excess Rainfall in Hours, The Duration of Rainfall Excess formula is defined as the time interval of the process that can generate surface runoff as rainfall excess, which is a process controlled at the surface of the soil. Duration of Excess Rainfall in Hours is denoted by D symbol.

How to calculate Duration of Rainfall Excess using this online calculator? To use this online calculator for Duration of Rainfall Excess, enter Lag Time of a 1-h Unit Hydrograph (T_p1) and hit the calculate button. Here is how the Duration of Rainfall Excess calculation can be explained with given input values -> 0.007944 = 1.1*95328.

FAQ

What is Duration of Rainfall Excess?

The Duration of Rainfall Excess formula is defined as the time interval of the process that can generate surface runoff as rainfall excess, which is a process controlled at the surface of the soil and is represented as D = 1.1*T_p1 or Duration of Excess Rainfall in Hours = 1.1*Lag Time of a 1-h Unit Hydrograph. Lag Time of a 1-h Unit Hydrograph is the time interval from the midpoint of the rainfall excess to the peak.

How to calculate Duration of Rainfall Excess?

The Duration of Rainfall Excess formula is defined as the time interval of the process that can generate surface runoff as rainfall excess, which is a process controlled at the surface of the soil is calculated using Duration of Excess Rainfall in Hours = 1.1*Lag Time of a 1-h Unit Hydrograph. To calculate Duration of Rainfall Excess, you need Lag Time of a 1-h Unit Hydrograph (T_p1). With our tool, you need to enter the respective value for Lag Time of a 1-h Unit Hydrograph and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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