What is the minimum discharge (in m³/s) required in a canal to satisfy the crop requirement for an area of 100 hectares with a total depth of water requirement of 35 cm over 120 days?

0.046 m³/s

Riddle: I am the depth of water needed by crops for full growth, often expressed in centimeters, and I vary with the irrigation schedule. What am I?

Delta (Δ)

True or False: The base period of a crop is always equal to its crop period.

False. The crop period is slightly more than the base period.

The ratio of the water output to the water input in an irrigation system is known as ______.

Efficiency

If 300 million cubic meters of live storage irrigates 40,000 hectares over 120 days, what is the duty for this crop (in hectares per cumec, round off to integer)?

689 to 693 hectares per cumec

What is the effective rainfall if the pan evaporation is 100 mm and the crop coefficient is 0.4?

40 mm

Riddle: I am the difference between the maximum water capacity of soil and the existing moisture content at the start of irrigation. What am I?

Available moisture

Fill-in-the-blanks: The total amount of water used by a plant in transpiration and evaporation is called ______.

Consumptive use

What is the irrigation efficiency if the irrigation water required is 20 mm and the effective rainfall is 20 mm, with an application efficiency of 50%?

40 mm

True or False: The duty of water increases as it moves downstream from the head of the main canal.

True.

The consumptive irrigation requirement (CIR) is calculated as ______.

CIR = Cu - Re

If the root zone depth is 1 m and the moisture holding capacity is 20 cm/m, what is the total moisture holding capacity for 1.7 m depth?

34 cm

Fill-in-the-blanks: The efficiency of water application is the ratio of the quantity of water stored in the root zone to the ______.

Quantity of water actually delivered into the field

What is the depth of irrigation water required to bring soil moisture from 18% to 28% in a 70 cm root zone with a density of 1.3 g/cm³?

91 mm

Riddle: I am the time from sowing to harvesting a crop, often expressed in days. What am I?

Crop period

True or False: The delta (Δ) of wheat is typically higher than that of rice.

False. Rice generally has a higher delta than wheat.

What is the irrigation water requirement for a crop if the consumptive use is 5 mm/day and the maximum root zone depth is 80 mm?

14.28 days

If a crop requires 55 cm of water during a 120-day base period and effective rainfall is 100 mm, what is the area that can be irrigated with a flow of 0.01 m³/s?

23.04 ha

Fill-in-the-blanks: The term duty refers to the area that can be irrigated with a unit volume of ______.

Irrigation water

What is the formula for calculating the water distribution efficiency (ηd)?

Ηd = (1 - d / D) x 100

Riddle: I measure the water needed in the root zone before irrigation and the ratio of water stored during irrigation. What am I?

Water storage efficiency (ηs)

True or False: Transit losses are the water lost during transportation from the source to the field.

True.

What is the primary factor affecting the duty of water related to soil type?

Permeability

If the irrigation water is applied with an efficiency of 60%, what is the effective rainfall that reduces the irrigation requirement?

More effective rainfall leads to less irrigation requirement.

Fill-in-the-blanks: The effective rainfall is the precipitation that is available to meet the ______ needs of the crop.

Evapotranspiration

What depth of water is required for a crop if the moisture holding capacity is 18 cm/m and the root zone depth is 1 m?

18 cm

Riddle: I am the depth of water needed to reach field capacity from existing moisture. What am I?

Irrigation depth

What is the effective rainfall that is considered in irrigation calculations?

Precipitation falling during the growing period of a crop that is available to meet the evapotranspiration needs of the crop.