This is the updated description for what used to be known as 'high-alumina cement' or HAC. The problem with this cement is that it is subject to what is known as 'conversion'.

Algae are photosynthetic organisms that occur in most habitats. They vary from small, single-celled forms to complex multi-cellular forms, such as the giant helps that grow to 65 meters in length. Algae are a large group of complex-celled photosynthetic organisms.

The theodolite is the basic instrument for measuring horizontal and vertical angles. It consists essentially of a sighting tube in form of a telescope, an horizontal and vertical scales, which are so set that horizontal and vertical angles of the object sighted in the telescope can be read from the scale (see fig. 5 and 6)

Some precipitation stations may have short breaks in the records because of absence of the observer or because of instrumental failures. It is often necessary to estimate this missing record.

The Barrage and the Head Regulators of feeder channels and appurtenant structures will be designed on the basis of standard design criteria established for other barrages and allied structures, already constructed on the Indus River and its tributaries.