कौन सी सिंचाई प्रणाली वाष्पीकरण और गहरे रिसाव के कारण होने वाले नुकसान को कम करके अधिकतम जल अनुप्रयोग दक्षता (water application efficiency) प्रदान करती है?

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%?