Free Apps for basic leakage calculations

JOAT Consulting (South Africa), one of the LEAKSUITE sponsors, strongly supports the LEAKSSuite objectives of disseminating free information technology to assist and improve international leakage and pressure management. To demonstrate the underlying principles of basic aspects of some of these calculations, JOAT has created a series of free Apps which users can easily access from a mobile platform (currently iPhone or iPad).

To access the free JO-Apps, use your iPad or iPhone to access this JO-Apps webpage in LEAKSSuite (or any other LEAKSSuite webpages with a right hand sidebar), then Click on the ‘Download on the Apps Store’ Icon. This takes you to App Shopper in the App Store.


The Table below shows:

  • The title of each module
  • Brief description of functionality
  • Links to background information on the topic in the LEAKSSuite website

As each of the Jo-Apps below will be reviewed and updated from time to time, some may be temporarily unavailable. Calculations are always made using the version which is current on the Cloud at the time.

JO-App ModuleJO-App DescriptionFor more Information on Leakssuite website
IWA Water BalanceUse this App to create a standard IWA volumetric Water Balance and Key Performance Indicators. Select Units for volumes, lengths, pressure, time period and % of time pressurised. Enter system characteristics, then volumes for each water balance component. KPIs appear when water balance completed. Concepts / IWA Water Balance
KPIs Fit for Purpose
Snapshot ILIUse this App to calculate Snapshot ILI. You will also need system characteristics and pressure at the Average Zone Point (AZP) at the time of the night flow measurement. AZP&NDFCalcs
Guideline 2013i
2014 CS13
Night-Day FactorUse this App to calculate the Night Day Factor – by entering hourly values of pressure at the Average Zone Point into the App. The Night Leakage Rate from the Night Flow Analysis is multiplied by the Night-Day Factor to assess the Daily Real Losses from a ‘bottom-up’ calculation. The Night-Day Factor is calculated for a range of FAVAD N1 value (0.5 to 1.5, with default of 1.0)AZP&NDFCalcs
Guideline 2013i
Concepts/FAVAD N1
FAVAD N1 Step Test CalculationUse this App to assess the FAVAD N1 exponent which measures the sensitivity of changes in pressure at the Average Zone Point to leak flow rates. At the time of minimum night flow, the inlet pressure is reduced in several steps, and when pairs of values of Night Leakage and Average Zone Pressure are entered in the App, several estimates of the FAVAD N1 are calculated.Concepts/FAVAD N1
Night Flow AnalysisUse this App to split minimum night flow into Night Use and Night Leakage components. Night leakage can be used diagnosing unreported leakage, calculating Snapshot ILI, and calculating daily leakage volume using Night-Day FactorPaper 2012K
Presentation 2012J

While the JOAT Group and the LEAKSuite Website and ILMSS Ltd make every effort to deliver high quality products, we do not guarantee that products made available through this website are free from defects. The JO-Apps software is provided “as is”, and you use it at your own risk.

We make no warranties as to performance, merchantability, fitness for a particular purpose, or any other warranties whether expressed or implied.

No oral or written communicator from information provided by the JOAT Group shall create a warranty.

Under no circumstances shall the JOAT Group and the LEAKSuite Website and ILMSS Ltd be liable for direct, indirect, special, incidental, or consequential damages resulting from the use, misuse, or inability to use this software, even if the JOAT Group has been advised of the possibility of such damages.