एक ओपन फ्ल्यूम आउटलेट (open flume outlet) को मुख्य रूप से किस रूप में वर्गीकृत किया जाता 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%?