Catchment Area given Peak Discharge of Unit Hydrograph Calculator

✖Peak Discharge is the maximum volume flow rate passing a particular location during an event.ⓘ Peak Discharge [Q_p]			+10% -10%
✖Basin Lag is the elapsed time between the occurrences of the centroids of the effective rainfall.ⓘ Basin Lag [t_p]			+10% -10%
✖Regional Constant (Snyder) is considered an indication of the retention and storage capacity of the watershed.ⓘ Regional Constant (Snyder) [C_p]			+10% -10%

✖Area of Catchment is the geographical area from which water flows into a particular point, such as a well, stream, or reservoir.ⓘ Catchment Area given Peak Discharge of Unit Hydrograph [A]

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Formula

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Catchment Area given Peak Discharge of Unit Hydrograph

Formula

A = Q p \cdot \frac{t p}{2.78 \cdot C p}

Example

3.205036 km² = 0.891 m³/s \cdot \frac{6 h}{2.78 \cdot 0.6}

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Catchment Area given Peak Discharge of Unit Hydrograph Solution

STEP 0: Pre-Calculation Summary

Formula Used

Area of Catchment = Peak Discharge*Basin Lag/(2.78*Regional Constant (Snyder))
A = Q_p*t_p/(2.78*C_p)
This formula uses 4 Variables

Variables Used

Area of Catchment - (Measured in Square Kilometer) - Area of Catchment is the geographical area from which water flows into a particular point, such as a well, stream, or reservoir.
Peak Discharge - (Measured in Cubic Meter per Second) - Peak Discharge is the maximum volume flow rate passing a particular location during an event.
Basin Lag - (Measured in Hour) - Basin Lag is the elapsed time between the occurrences of the centroids of the effective rainfall.
Regional Constant (Snyder) - Regional Constant (Snyder) is considered an indication of the retention and storage capacity of the watershed.

STEP 1: Convert Input(s) to Base Unit

Peak Discharge: 0.891 Cubic Meter per Second --> 0.891 Cubic Meter per Second No Conversion Required
Basin Lag: 6 Hour --> 6 Hour No Conversion Required
Regional Constant (Snyder): 0.6 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

A = Q_p*t_p/(2.78*C_p) --> 0.891*6/(2.78*0.6)

Evaluating ... ...

A = 3.20503597122302

STEP 3: Convert Result to Output's Unit

3205035.97122302 Square Meter -->3.20503597122302 Square Kilometer (Check conversion here)

FINAL ANSWER

3.20503597122302 ≈ 3.205036 Square Kilometer <-- Area of Catchment

(Calculation completed in 00.004 seconds)

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Regional Constant given Peak Discharge for Nonstandard Effective Rainfall

Go Regional Constant (Snyder) = Peak Discharge*Modified Basin Lag/(2.78*Area of Catchment)

Peak Discharge for Nonstandard Effective Rainfall

Go Peak Discharge = 2.78*Regional Constant (Snyder)*Area of Catchment/Modified Basin Lag

Catchment Area given Peak Discharge for Nonstandard Effective Rainfall

Go Area of Catchment = Peak Discharge*Modified Basin Lag/(2.78*Regional Constant)

Modified Basin Lag given Peak Discharge for Nonstandard Effective Rainfall

Go Modified Basin Lag = 2.78*Regional Constant*Area of Catchment/Peak Discharge

Catchment Area given Peak Discharge of Unit Hydrograph Formula

Area of Catchment = Peak Discharge*Basin Lag/(2.78*Regional Constant (Snyder))
A = Q_p*t_p/(2.78*C_p)

What is Lag Time in hydrology?

The Lag time is the delay between the maximum rainfall amount and the peak discharge. The shape of a hydrograph varies in each river basin and each storm event. This increases lag time. The peak discharge is also lower as it takes water longer to reach the river channel.

What is the Catchment Area of a river?

A water catchment (commonly referred to as a “watershed”) is an area of land where all water flows to a single stream, river, lake or even ocean. Natural boundaries of water catchments can be very small for a single creek or stream or quite large—the Colorado River basin for example.

How to Calculate Catchment Area given Peak Discharge of Unit Hydrograph?

Catchment Area given Peak Discharge of Unit Hydrograph calculator uses Area of Catchment = Peak Discharge*Basin Lag/(2.78*Regional Constant (Snyder)) to calculate the Area of Catchment, The Catchment Area given Peak Discharge of Unit Hydrograph formula is defined as the area where water is collected by the natural landscape. Imagine cupping your hands in a downpour of rain and collecting water in them. Area of Catchment is denoted by A symbol.

How to calculate Catchment Area given Peak Discharge of Unit Hydrograph using this online calculator? To use this online calculator for Catchment Area given Peak Discharge of Unit Hydrograph, enter Peak Discharge (Q_p), Basin Lag (t_p) & Regional Constant (Snyder) (C_p) and hit the calculate button. Here is how the Catchment Area given Peak Discharge of Unit Hydrograph calculation can be explained with given input values -> 3.2E-6 = 0.891*21600/(2.78*0.6).

FAQ

What is Catchment Area given Peak Discharge of Unit Hydrograph?

The Catchment Area given Peak Discharge of Unit Hydrograph formula is defined as the area where water is collected by the natural landscape. Imagine cupping your hands in a downpour of rain and collecting water in them and is represented as A = Q_p*t_p/(2.78*C_p) or Area of Catchment = Peak Discharge*Basin Lag/(2.78*Regional Constant (Snyder)). Peak Discharge is the maximum volume flow rate passing a particular location during an event, Basin Lag is the elapsed time between the occurrences of the centroids of the effective rainfall & Regional Constant (Snyder) is considered an indication of the retention and storage capacity of the watershed.

How to calculate Catchment Area given Peak Discharge of Unit Hydrograph?

The Catchment Area given Peak Discharge of Unit Hydrograph formula is defined as the area where water is collected by the natural landscape. Imagine cupping your hands in a downpour of rain and collecting water in them is calculated using Area of Catchment = Peak Discharge*Basin Lag/(2.78*Regional Constant (Snyder)). To calculate Catchment Area given Peak Discharge of Unit Hydrograph, you need Peak Discharge (Q_p), Basin Lag (t_p) & Regional Constant (Snyder) (C_p). With our tool, you need to enter the respective value for Peak Discharge, Basin Lag & Regional Constant (Snyder) and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Area of Catchment?

In this formula, Area of Catchment uses Peak Discharge, Basin Lag & Regional Constant (Snyder). We can use 1 other way(s) to calculate the same, which is/are as follows -

Area of Catchment = Peak Discharge*Modified Basin Lag/(2.78*Regional Constant)

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