Conversions Between U.S Customary Units and SI Units

Roman and Arabic Numerals

I	1	IX	9	XVII	17	LX	60	CCCC	400
II	2	X	10	XVIII	18	LXX	70	CD	400
III	3	XI	11	XIX	19	LXXX	80	D	500
IV	4	XII	12	XX	20	XXC	80	DC	600
V	5	XIII	13	XXI	21	XC	90	DCC	700
VI	6	XIV	14	XXX	30	C	100	CM	900
VII	7	XV	15	XL	40	CC	200	M	1000
VIII	8	XVI	16	L	50	CCC	300	MM	2000

The Metric System

The metric system is a system of weight and measurement which was first adopted by France and is now almost universally used in the sciences and art. The greater part of population of the world works on the metric system.

Basic standards: Relation between English measure and Metric measure is as follows.

1 inch               = 25.4 mm                   = 2.54 cm

1 meter             = 39.37 inches             = 1.09 yards

1 liter                = 1.76 pints                  = 0.22 galls (imp)

1 gallon (imp)   = 4.546 liters

1 gallon (US)    = 3.785 liters

1 pound avp     = 0.4536 kilograms

1 kilogram        = 2.2046 pound avp

The metric system of unit called centimeter – gram – second (CGS) system is commonly used in scientific circle, and meter – kilogram – second (MKS) or metro – ton – second (MTS) system is more generally used in engineering.

Design

Design

Water Supply System Configuration

In general, water distribution system can be divided into four main components:

1. Water Source and Intake works
2. Treatment work and Storage
3. Transmission main
4. Distribution Network

The common resources for the untreated or raw water are from surface water source such as rivers, lakes, springs, man made reservoirs and groundwater sources as bores and shallow wells.

Individual water supplies are usually from bores and shallow wells. Communal water supply can be from all water resources depending on quantity and quality of raw water. The raw water is transported to the treatment plant for processing thought transmission mains and stored in clear water reservoirs after treatment. The degree of treatment depends upon the raw water quality and finished water quality requirements.  

Water is carried over long distance trough transmission main to pump house or gravity reservoir then to be distribution to costumers by distribution network.

Reference: Design of water supply pipe network/ Prabhata k. Swamee, Ashok K. Sharma