Since the water level drops fast during the first one or two hours of the test, readings should be taken at short intervals which are gradually increased as the pumping continues. Fairly accurate measurements of water level can be made by using an electric sounder, by the wetted tape method (the steel tape is coloured with chalk and lowered inside [...]
The selection of a proper pumping set is important to ensure continued satisfactory yields from wells and the factors to be considered are: (i) Finished inside diameter and total depth of the well. (ii) Yield from the well, the desired pumping rate and hours of pumping per day. (iii) The lowest pumping water level (in the dry season). (iv) The [...]
In this article we will discuss about how to compute runoff caused due to rainfall using unit hydrograph. Introduction to Unit Hydrograph: If two identical rainfalls regarding their characteristics take place in a drainage basin having the same conditions prior to the rainfall, the runoff hydrographs from the two storms would be the same. This is the basic concept used [...]