1) Type of Crop: Different crops require different amount of water, and hence the duties for them are different. Duty will be less for a crop requiring more water and vice-versa
2) Climate and Season: In hot season, the atmospheric temperature of the area becomes high, the evaporation loss is more hence duty gets reduced as crop requires more water.
3) Rainfall: More the rainfall less will be the requirement of irrigation water, and hence more will be the duty.
4) Type of Soil: If soil is permeable, water lost due to percolation will be more, hence duty will be less and vice-versa.
5) Method of Irrigation: If method of irrigation is not proper i.e. in case of free flooding, wastage of water will be more and hence less duty.
6) Canal condition: Canal should be kept in proper condition by proper maintenance and lining, which will reduce the seepage, leakage and thus increase the duty.
7) Mode of Assessment: The tendency of using more water can be checked by adopting volumetric assessment which gives more duty than area wise assessment.
8) Method of tilling (cultivation): If proper method of tilling is adopted there will be less wastage of water, thus duty is more.