NUMERIC INPUT

In the Data Input menu select Numeric Input.

For every basin the data input is structured on more levels: at the first level the basin vertices, basin's internal vertices coordinates and those of the main reach.

Basin vertices

It is a condition that the basin be defined as rising from left to right.

The option selection enables a grid where we can find:

N = vertex order number;

X = vertex abscise;

Y = vertex ordinate;

Z = vertex elevation;

Name = vertex identification.

Once the coordinates' entry is confirmed by pressing OK in the work area is viewed the watershed line; on the right of the work area can be viewed the in coordinates, so the alteration of every filled in vertex is possible in this phase.

Adding basin's elevation vertices

The user fills in the basin's interior vertices coordinates X, Y, Z. This is necessary for determining the morphological proprieties of the basin (areas, inclinations, etc) at the end of DEM's creation (Digital Elevation Model).

Main reach vertices

The main reach represents the water course that has its origins and its last point in the basin's transversal section; All its confluent ramifications are considered secondary reaches. The main reaches are determined starting from the spring point of the basin to its closing point. These vertices are important to determine the DEM and to determine the triangularisation, so they are compulsory for the further computation of the project.

At the second level of the numeric input are determined the secondary reach's vertices, confluent on the main reach.

Secondary reach vertices

The number of secondary reaches is entered in this phase: the program automatically considers the presence of a single secondary reach, so to add more you have to position the mouse on reach 1, make a click on the right button of the mouse and select New Secondary reach. To eliminate a reach proceed like explained before and select Eliminate.

The vertices that define every secondary reach are filled in the grid (N, X, Y, Z, Name) from the spring point of the reach to the confluence one.

At the third level of the numerical input the transversal sections are defined.

Section line

Every transversal section (more than one might be present) must be defined by points (X, Y, Z) so from the left to the right. To fill in more sections proceed from down upwards. Depending on every section's line the program will develop the hydraulically checking.

Hydrologic Risk takes into consideration a feeding sub-basin for every transversal section, whose coordinates are defined at the next level.

The section line must be drown with the mouse (GRAPHIC INPUT) on the river's reach, from the left side with the mouse down by displacing it to the right. Once the mouse is released section's size is defined and the work window is opened where the section can be viewed. In the section's right side can be viewed the section's data within the work window.

•Type: in this sheet are presented the predefined forms for determining the section (circle, rectangle, parabola, trapeze); for each predefined form the programs asks for the dimensions that define the exact geometry of the section (ex: the diameter, for circle; the base and height for the rectangle; etc.)

•Section Data: the filled in data in the precedent worksheet are viewed with the possibility to alter them. Here there are specified the watered outline through indicating section's pints that have been watered. The <Generate Section> command views the water level and realizes the first hydraulical computations:

1. Aria: watered section area in m².

2. Watered outline: watered section's perimeter made from the solid basin's walls (free currents) in m.

3. Hydraulic ray: the liquid section area and the watered outline in m.

4. Section water height: liquid section' s height in m.

· Flows: the flows sheet views the high flood flows calculated with the empirical and analytical methods, for the specified Recurrence interval T (General Data); these results are viewed at the end of the computation (Computation Menu – Maximum high flood flow) according to the empirical and rational methods. The user can check each section for every recurrence interval, assigning personalized values.

At the fourth level are defined the eventual sub-basins within the main one.