This type of dam is made up of only one type of material. Usually porous materials is used. These dams are easy and cheap to construct but cannot be used to make multipurpose large dams. For large multipurpose dams zoned type method is used. Over topping failures result from the erosive action of water on the embankment. Erosion is due to

Planning: Process of choosing the method and order of work Scheduling: Process of determining the interrelationship of associated timings of operations. Steps in Construction Scheduling Splitting of the project into work activities Determining logic relationships/interrelationships between activities. Construction of Network Diagrams.

The simplest form of control for a spillway is the free, or uncontrolled, overflow crest, which automatically releases water whenever the reservoir water surface rises above crest level. The advantages of the uncontrolled crest are the elimination of the need for constant attendance and regulation of the control devices by an operator and the freedom from maintenance

In this relation, two activities start together i.e. the start dates of the two activities, linked through Start to Start relation, will be same although the said activities may end on different dates. This relation is denoted by SS. This relation is used where we need two or more activities to start on same date. This will help us to speed up the project and we will attain more progress

Some water is used to wet the surface of instrument. The rain recorded may be less than the actual rainfall due to the direction of the rainfall as affected by wind. Dents in the collector and tube may also cause error.