Abstract:
Hydrology  is  an earth science,  which deals with the movement of   water   under natural conditions.  The process of   movement   of water   in   the system is often considered to   be   within   natural 
tv1.01	4	4Vg. lotqwn	40  ti t5forology,	Climatology   and   Soil
science. 
A   catchment   is   an  individual  entity,   and   are   naturally occurring   units  of  the  land  scape,  which contains  complex   array of  interlinked  and  interdependent  resources  and  activities   irre-
spective   of   political   boundaries.  Also  it  is   a   logical   unit having   readily   identifiable  boundaries  and   characteristics   of water  movement,   this  helps  in  coordinate  planning and management. 
In  the  engineering hydrology,  flood  routing  is  an   important technique  necessary  for  complete  solution of  flood-control   problems   and   for   the  satisfactory operation   of   flood   prediction services.   The  application  of routing techniques helps in   finding of  solution  to  numerous  problems  such as,  design of spillway size for  intermediate  and  large  dams,  synthesis  of  runoff   hydrographs from   gauged   and  ungauged  catchments  and  to  set  up   the   warning services   for   the  planning,  executing and  maintenance   of   water resources  projects. 
This  report has  been  prepared by  Sri	. Venkatesh.  B,	Scien-
tist  'B'  RCNIH,  Belgaum,   in  connection with ongoing  UNDP   project
IND/90/03   entitled   "  Developing   Capabilities   in   Hydrological
Studies".
SATISH  CHANDRA 
'	DIRECTOR
NATIONAL  INSTITUTE  OF  HYDROLOGY