Marks 1
1
A canal supplies water to an area growing wheat over 100 hectares. The duration between the first and last watering is 120 days, and the total depth of water required by the crop is 35 cm. The most intense watering is required over a period of 30 days and requires a total depth of water equal to 12 cm. Assuming precipitation to be negligible and neglecting all losses, the minimum discharge (in m3 /s, rounded off to three decimal places) in the canal to satisfy the crop requirement is __________________.
GATE CE 2023 Set 1
2
In a certain month, the reference crop evapotranspiration at a location is 6 mm day. If the crop coefficient and soil coefficient are 1.2 and 0.8, respectively, the actual evapotranspiration in mm/day is
GATE CE 2022 Set 2
3
During a particular stage of the growth of a crop, the consumptive use of water is 2.8 mm/day. The amount of water available in the soil is 50% of the maximum depth of available water in the root zone. Consider the maximum root zone depth of the crop as 80 mm and the irrigation efficiency as 70%. The interval between irrigation (in days) will be ___________. (round off to the nearest integer)
GATE CE 2022 Set 1
4
The two columns below show some parameters and their possible values.
Which of the following options matches the parameters and the values correctly?
| Parameters | Value |
|---|---|
| P-Gross Command Area | I-100 hectares/cumec |
| Q-Permanent Wilting Point | II-6℃ |
| R-Duty of canal water | III-1000 hectares |
| S-Delta of wheat | IV-1000 cm |
| V-40 cm | |
| VI-0.12 |
GATE CE 2015 Set 1
5
An outlet irrigates an area of 20 ha. The discharge (lit/sec) required at this outlet to
meet the evapotranspiration requirement of 20mm occurring uniformly in 20 days
neglecting other field losses is
GATE CE 2008
6
The consumptive use of water for a crop during a particular stage of growth is
2.0mm / day. The maximum depth of available water is the root zone is 60mm.
Irrigation is required when the amount of available water is 50% of the maximum
available water in the root zone. Frequency of irrigation should be
GATE CE 2007
7
A sprinkler irrigation system is suitable when
GATE CE 2004
8
If duty (D) is 1428 hectares/cumec and base period (B) is 120 days for an irrigated crop, then delta ($$\Delta$$) in meters is given by
GATE CE 2000
Marks 2
1
A pump with an efficiency of 80% is used to draw groundwater from a well for irrigating a flat field of area 108 hectares. The base period and delta for paddy crop on this field are 120 days and 144 cm, respectively. Water application efficiency in the field is 80%. The lowest level of water in the well is 10 m below the ground. The minimum required horse power (h.p.) of the pump is _________. (round off to two decimal places)
(Consider 1 h.p. = 746 W; unit weight of water = 9810 N/m3
GATE CE 2022 Set 2
2
The culturable command area of a canal is 10,000 ha. The area grows only two crops-rice in
the Kharif season and wheat in the Rabi season. The design discharge of the canal is based on
the rice requirements, which has an irrigated area of 2500 ha, base period of 150 days and
delta of 130 cm. The maximum permissible irrigated area (in ha) for wheat, with a base period
of 120 days and delta of 50 cm, is_______.
GATE CE 2017 Set 2
3
The transplantation of rice requires 10 days and total depth of water required
during transplantation is 48 cm. During transplantation, there is an effective
rainfall (useful for irrigation) of 8 cm. The duty of irrigation water (in hectare/
cumec) is:
GATE CE 2013
4
Wheat crop requires 55 cm of water during 120 days of base period. The total rainfall during this period is 100 mm. Assume the irrigation efficiency to be 60%. The area (in ha) of the land which can be irrigated with a canal flow of 0.01 $$m^3/s$$ is
GATE CE 2012
5
The moisture holding capacity of the soil in a 100 hectare farm is 18cm/m. the field is to
be irrigated when 50 percent of the available moisture in the root zone is depleted. The
irrigation water is to be supplied by a pump working for 10hours a day, and water
application efficiency is 75%. Details of crops planned for cultivation are as follows:
The capacity of irrigation system required to irrigate crop X in 36 hectares is
| Crop | Root zone depth (m) | Peak rate of moisture use(mm/day) |
|---|---|---|
| X | 1.0 | 5.0 |
| Y | 0.8 | 4.0 |
GATE CE 2010
6
The moisture holding capacity of the soil in a 100 hectare farm is 18 cm/m. the field is to
be irrigated when 50 percent of the available moisture in the root zone is depleted. The
irrigation water is to be supplied by a pump working for 10hours a day, and water
application efficiency is 75%. Details of crops planned for cultivation are as follows:
The area of crop Y that can be irrigated when the available capacity of irrigation
system is 40 liters/sec is
| Crop | Root zone depth (m) | Peak rate of moisture use(mm/day) |
|---|---|---|
| X | 1.0 | 5.0 |
| Y | 0.8 | 4.0 |
GATE CE 2010
7
An agricultural land of 437ha is to be irrigated for a particular crop. The base
period of the crop is 90 days and the total depth of water required by the crop is
105cm. If a rainfall of 15cm occurs during the base period, the duty of irrigation
water is
GATE CE 2009
8
The culturable command area for a distributary channel is 20,000 hectares. Wheat
grown in the entire area and the intensity of irrigation is 50%. The kor period for
wheat is 30 days and the kor water depth is 120mm. The outlet discharge for the
distributary should be
GATE CE 2007
9
A tube well having a capacity of 4 $$m^3 /hour$$ operates for 20 hours each day during the irrigation season. How much area can be commanded if the irrigation interval is 20 days and depth of irrigation is 7 cm?
GATE CE 2000