SCOPE AND DESIGN OF THE PROGRAM

The calculations on this site are suitable for simple calculations of watercourses and structures.
The site can also be used for design calculations for input into a larger calculation program such as SOBEK etc.
The site consists of 14 'calculation sheets' in which the hydraulic parameters of a watercourse or of a structure can be calculated.
The necessary variables can easily be entered in an input sheet set up for this purpose.
The right profile or size can be found by varying one or more variables a few times.
If desired, a printout of the calculation can be made using. a 'print-friendly version'.
In relevant places, the program includes overviews and tables of various parameters and loss coefficients, which can be adjusted in the calculation to the given situation.
In each calculation - in the column om the left side - information about the input of the relevant calculation can be called up.
The relevant theoretical base can also be called up there.


POSSIBILITIES OF THE PROGRAM

Watercourses:
The program can be used to calculate cross sections of watercourses.
These cross sections can be formed symmetrically as well as asymmetrically with a kinked slope, with one-sided or two-sided water banks or with an arbitrary shape with a maximum of 20 (incorporated) points.
The watercourses with a straight slope can be calculated in three ways.
   1. The calculation of the gradient based on a given flow rate.
   2. The calculation of the flow rate based on a given gradient.
   3. Calculation of the minimum required (optimal) width and water depth, based on a known gradient and flow rate.
Of the watercourses with a kinked slope or any shape, both the gradient can be calculated - based on a given flow rate - and the flow rate - based on a given gradient.
In addition, the occurring speed, the Km value, the wet surface and the width on the waterline are calculated.
If the drainage and the ground level are entered, the program calculates the content of the profile and the insertion width for the purpose of earthmoving and soil herd calculations.
There is a check for 'shooting water' (Froude number).

Structures:
Calculations can be made for round and square culverts, mouth profiles, inlets, various shapes of weirs and fish ladders.
For the round and square culverts, by inserting bends or kinks, heddles and syphons can be calculated.
Also valves can be inserted.
For these structures, the program includes tables showing the most common dimensions; Km values and loss coefficients witch can be selected and applied in the calculation.
At inlets, the head can be calculated at a given flow rate as well as vice versa.
Here too, losses for existing gates can be included in the calculation.
Weirs can be calculated, both manually operated (fixed lower level and crest height) and automatically operated (with fixed upper and lower level).
The program checks whether the weir is 'free discharged' or 'drowned'.
The calculation for weirs includes an overview of the most common crest shapes with associated m-values.
The calculations are based on the common hydraulic formulas for watercourses and structures.
Under 'theoretical backgrounds' an overview is given of the formulas used and - if applicable - the limitations in the use of these formulas.

General
You can navigate through the input form using the (shift) tab key.
Pay attention! If you press the "enter key" , one activates the next 'enter button' and the calculation will usually be aborted.

In some places you will find an exclamation mark next to a parameter to be entered.
If you activate the exclamation mark, a message appears that gives an indication of how the parameter can or must be entered.
In addition to exclamation marks, question marks appear next to parameters to be entered in the calculations.
If you activate the question mark, a 'pop-up' appears in which information is given about the parameter concerned.
The information consists of commonly used standards and rules of thumb, related to the parameter.
The standards and rules of thumb are derived from the (Dutch)cultural-technical vade-mecum 1996 and from practical experience.
It should be noted here that as far as the indicated standards for drainage and drainage are concerned, the developments regarding the systematics of GGOR .RainfallRunoff calculations etc. have been ignored.
The standards and rules of thumb should be used to support the calculations.
The user is of course free to enter the parameters at his own discretion.

A lot of effort has gone into reporting errors in the input.
As a result, it is almost impossible to calculate values that would yield an impossible outcome.
(An exception to this is the calculation of mouth profiles. The program does not check whether a good mouth profile is formed with the entered dimensions. The use of a manufacturer's catalog is necessary here)
The values entered in a calculation remain available during the calculation, making it easy to calculate a number of variants for a situation.