(3) Peak Hour Consumption on Annual Maxi-

component in the distribution system will depend

mum Day (MDC/Peak-Hour)

upon the effective combination of the major system

(4) MDC plus Simulated Fireflow

elements: supply source, storage, pumping, and

Several analyses should be made to investigate

distribution piping. The hydraulic analysis of the

alternative piping arrangements within the distri-

total distribution system is discussed in TM

bution system as well as for connecting proposed

5-813-5. Water storage is discussed in TM

pumping stations to the distribution system. If

5-813-4.

future improvements are contemplated, the analysis

should be performed based on future conditions,

thus assuring the correct selection of the final

alternative to be implemented initially.

estimates are the basis for determining the flow

demand of a water supply and distribution system.

the system will assume the following criteria:

Flow and pressure demands at any point of the

(1) Maximum curb pressures (70 psi)

system are determined by hydraulic network analy-

(2) Minimum curb pressures at any point on the

sis of the supply, storage, pumping, and distribution

network (usually 30 psi)

system as a whole. Supply point locations such as

(3) Residual curb pressure to be maintained at

wells and storage reservoirs are normally known

a point of simulated fireflow (20 psi minimum) For

based on a given source of supply or available

large distribution system design a pressure contour

space for a storage facility. Criteria for determining

map will be developed using known topography

water demands are discussed in TM 5-813-1 and

and the hydraulic network analysis and showing

TM 5-813-7.

pressure in pounds per square inch. Pressure

contours must be adjusted for elevations of

draulic network analysis should assume the follow-

surrounding terrain. The pump discharge head will

ing demand rates:

be derived from the system pressures at the pump

(1) Annual Average Daily Consumption (ADC)

station location plus the pump station piping head

(2) Annual Maximum Daily Consumption

loss.

(MDC)

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