## Relation Between Base, Delta and Duty

Let assume,

- 'D' is the duty of water, unit hectares/cumec
- 'B' is the base period of the crop, the unit in day.
- 'Δ' is the total depth of water, unit meter.

**B days**to obtain a

**depth of water**

**Δ**over an area of land

**D hectares**.

Hence, we can write

⇒ 1 cumec for B days gives Δ over D hectares.

⇒ 1 cumec for 1 day gives Δ over D/B hectares.

⇒ 1 cumec for 1 day(

**1 cumec-day**) =**(D/B)⨯****Δ**hectares-meter [Equation 1].
Now, calculate the value of

**1 cumec-day**= 1**⨯**24**⨯**60**⨯**60=86400 m³.
We know that 1 hectare is equal to 10000 m², now convert 86400 m³ into a hectares-meter.

So, 1 cumec-day =86400 m³ =

**8.64 hectares-meter**[Equation 2].
From equation 1 and 2 we can write

Relation Between Base, Delta and Duty |

*⇰ (D/B)⨯*

*Δ = 8.64*.

*⇰ (D/B)⨯*

*Δ = [(8.46⨯ B)/D*] Unit in meter

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