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Here is the 11th part of our notes for the preparation of the GATE and PSUs exams.

Here is the 11th part of our notes for the preparation of the GATE and PSUs exams.

- Fertility of a soil is adversely affected, when the pH value is more than 11.
- Optimum depth of kor watering for rice crop is nearly 19 cm.
- Average delta of rice crop is nearly 120 cm.
- The duty of a crop is 432 hectares/cumec, when base period of the crop is 100 days. Delta for the crop will be 200.
- Water consumed in irrigation, when compared with the total water used for all purposes in our country, is about 90%.
- Water consumed for producing one tonne of wheat and one tonne of rice will be of order 2000 tonnes and 4000 tonnes.
- Lime concrete lining is used when velocity of flow is below 2 m/sec, irrigation channel with capacity upto 200 cumec and where economy is required.
- Thickness of concrete lining, for discharge upto 200 cumec varies from 10 to 15 cm.
- Force considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition is self weight.
- Uplift pressure on a dam can be controlled by pressure grouting in foundation, constructing drainage channels between dam and its foundation and by constructing cut-off under upstream face.
- In a gravity dam total force due to wave pressure acts at a height of 0.375.hw above the still water level.
- Horizontal acceleration due to earthquake results in hydro-dynamic pressure and inertia force in the body of the dam.
- Vertical acceleration due to earthquake results in increase in the effective weight of the dam and also decrease in the effective weight of the dam.
- In the elementary profile of a dam having empty reservoir condition, vertical stress at heels and toe are respectively given by 2W/B and 0.
- In gravity dam, main overturning force is water pressure.
- For economical design of a gravity dam, shear friction factor should be 0.65.
- In Ogee shaped spillway, discharge is proportional to H^(3/2).
- Garrets diagrams are based on Kennedy's theory.
- Discharge co-efficient of an Ogee-shaped spillway is 3.7.

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