Minimal Radios in Canales

When the channel design, it is important to keep in mind that the abrupt change of direction is replaced by a curve of a radius “that should not be too large”, that is to say that a minimum radius should be chosen, since when plotting curves with radiuses greater than the minimum it does not result in any savings in energy, and it will only help to make the item of ground movement more expensive.

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The following tables indicate some recommended radios, depending on each author:

Minimum radius depending on the flow rate
Channel capacity	Minimum radius
Up to 10 m3/s	3 * width of the base
From 10 to 14 m3/s	4 * width of the base
From 14 to 17 m3/s	5 * width of the base
From 17 to 20 m3/s	6 * width of the base
From 20 m3/s to greater	7 * width of the base
Minimum radiuses should be rounded up to the next upper meter

Source: “Inter nat ional Ins t it ute For Land Re cryat ion And Improvement ” ILRI, Principles and Applications of Drainage, Volume IV, Wageningen The Netherlands 1978.

Minimum radius in open channels for Q < 20 m
Channel capacity [m3/s]	Minimum Radio [m]
20	100
15	80
10	60
5	20
1	10
0.5	5

Source: Ministry of Agriculture and Alime ntación, Technical Bulletin No. 7 “General Considerations on Trapezoidal Channels” Lima 1978.

Minimum radius in open channels depending on the water mirror
Irrigation channel		Drainage channel
Type	Radio	Type	Radio
Sub – Channel	4T	Main Collector	5T
Lateral	3T	Collector	5T
Sub-Lateral	3T	Sub – Collector	5T

Source: Salzgitter Consult GMBH “Channel Planning, Ferreñafe Pilot Zone” Volume II/ 1- Project Tinajones – Chiclayo 1984.

Elements of a Curve

A = Arc, is the curve length measured on strings of 20 m

C = Long rope, is the string that subsets – the curve from PC to PT is drawn.

ß = Angle of deflection, formed in the PI.

E = External, is the distance from PI to the curve measured on the bisector.

F = Arrow, is the length of the perpendicular descent from the midpoint of the curve to the long rope.

G = Grade, is the central angle.

LC = Curve length that connects PC to PT.

PC = Principle of a curve.

PI = Inflection point.

PT = Tangent point.

PSC = Point on curve.

PST = Point on tangent.

R = radius of the curve.

ST = Sub tangent, distance from PC to PI.

Source: MANUAL – HYDRAULICAL WORKS DESIGN CRITERIA FOR MULTISECTORIAL AND HYDRICAL HYDRAULIC DEPROYECTS FORMULATION.

Minimal Radios in Canales

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