Which of the following canal outlets gives a discharge that is relatively constant and fixed within certain limits, irrespective of fluctuations in the water levels of the distributary and the watercourse?

Groynes are constructed for river bank protection. When a groyne is inclined downstream in the direction of flow, it is designated as a:

What is the available moisture depth for evapotranspiration in a root zone of 1 m depth soil, if the dry unit weight of soil is 1.5 g/cc, field capacity is 30%, and permanent wilting point is 10%?