Total Infiltration by Horton's Equation

Problem

To calculate the total infiltration and total runoff for a certain catchment

Given,

Initial Infiltration Capacity(Fi),Final Infiltration Capacity(Ff),Horton's Constant,Time(T)

Solution

Calculate Total Infiltration.Then assume the evaporation loss as some constant.Subtract both of them from Precipitation to get the Runoff.

Methodology

1.Visit "Total Infiltration by Horton's Equation" Calculator

2.Put the given Initial Infiltration Capacity(Fi),Final Infiltration Capacity(Ff),Horton's Constant,Time(T)

3.Click Calculate.

k is often given in per day.You must convert it to per hour if the time period and Fi,Ff is given in hours.

Calculator is based on the integration of Horton's Equation

Volume of Evaporation

Problem :

To estimate the monthly evaporation loss

Given :

Reservoir area at the beginning and ending of the time period (eg : 1 month or 1 year)

Pan depth : 15cm

Solution :

You have to calculate the volume of evaporation.

Methodology

1.Go to Volume of Evaporation Calculator

2.Put the values of reservoir area at the beginning(IR) and ending(FR) of the time period

3.Pan depth(h)

4.Assume a value of pan coefficient(k) : k : 0.7(generally)

5.Click 'Submit'

6.You will get the evaporation of month May.Now calculate for all the 12 months.This will give a clear estimation of monthly pan evaporation of the reservoir.

The calculator calculates the volume of evaporation with the help of following formula :

= (k*h/3)*(IR+FR+Square Root of IR*FR)