Program Idro 

Aqueducts design

Purpose Aqueducts design.

Features The program calculates the steady state of an aqueduct.
It analizes the performance of the system and can be used to design system components to meet distribution requirements.
In addition performs water quality modeling, calculating the source tracking and determining the staying time of the water.

Defining the network
The network is described by a directed graph in which:

  • arcs are the elements of the net,
  • nodes are the points of junction of two or more elements.

:Possible elements are:

  • tanks (feeds to the net),
  • pipes,
  • demands (concentraded in the nodes or distributed along the pipes), 
  • head pumps,
  • pressure relief valves,
  • interception valves,
  • minor losses (pipe enlargements, pipe constrictions, bends, tee joints, .... ).

Applied formulas
We recommend using Darcy Weisbach Colebrook's formula.
These others are inserted only for completeness:

  • Darcy' formula,
  • Bazin's formula.

Contemporaneity coefficient
Families demands are strongly intermittent.
The more are the families supplied, the less is probable that all flow rates have the maximum value at the same time.
Contemporaneity coefficient  is defined as the ratio between maximum theoretical demand and real demand; where maximum theoretical demand is the product of family maximum demand by the number of supplied families.

Contemporaneity coefficient changes along the network.
To design correctly an aqueduct it is necessary to apply the contemporaneity coefficient to every pipe flow rate, according to the number of families supplied by the pipe.
For more details see chapter 4.10 of book "Program Idro release 3.2 - Steady  state calculation of an aqueduct) joined to the program.
Chapter 4.10 Download  (

Program checks inputs values and verifies the network behaviour. 

Linking to a cartographic system



The program may run in two ways:
  • as a stand alone program,
  • connected to a cartographic system.

In this second point the program only calculates the steady state and save results.

These companies supply cartographic systems including program Idro:

SMD  via Milano, 4 - 20070 Dresano (Mi)
Edison  foro Bonaparte, 31 - 20121 Milano

Network restrictions Program is furnished in two editions: enterprise and light:

Entrprise edition restriction

  • maximum number of nodes  10000,
  • maximum number of pipes   10000,
  • maximum number of sources    200,
  • maximum number of booster stations  200,
  • maximum number of relief valves        200,
  • maximum number of minor losses       200,
  • maximum number of interception valves  400,
  • maximum number of gas mixture components  12.

Light edition restriction: the maximum number of nodes is  400.

Platforms Windows 95 and those after.


Program Idro - release 3.2
hydraulic and water quality analysis for pipe networks

The book (121 pages), written with contribution of Enidata (ENI group):
  • describes, in detail, all the equations utilized,
  • explains how to use the program.

Price Enterprise edition
Program Idro + book :   500 euro + 100 (taxes)  =  600 euro.

Light edition
Program Idro + book:    250  euro +  50 (taxes)   = 300 euro.

Download Demo program download

Program description download

Ing. Valerio Tarenzi
via Pellegrino Rossi, 5   40131 Bologna
tel. 051-523101