Rate of demand design period population

Various types of designs 

1. Domestic, industrial and commercial

Public use and losses and thefts fire demands

Kuichling formulae

Free man formula and national board of fire underrates busthin formulae

Factors affecting rate of demand 

Size of city climatic conditions types of genetry and habits  industrial and commercial activity quality of water supply and pressure in the distribution system development of sewage facilities system of supply cost of water policy of metering 

Intermittent system generlay consumption is less continues supply 

Design of period 

Dams and conveyance pipes and distribution system water treatment units pumps and service reservoir.

Population methods 

Arithmetic increase method geometric increase method and incremental increase method decrease rate method and comparatively graphical method simple method .

Surface reservior : lakes ans ponds 

Stremas or rivers  storgae reservior 

Oceans  sub surface reservior 

Infiltration gallers ans infiltration wells springs and tube wells  open well. Or dug wells 

Tube wells and intake structure.