Irrigation System Designing - Practices of Irrigation and On-farm Water Management - page 97

manual & FURDEV: FURow Design - management manual. Unpublished manuals.
Institute for Land and Water Management, Katholieke Universiteit Leuven, Leuven,
Belgium). The volume balance model consists of a spatially and temporally lumped
form of the continuity equation and is applied primarily to the advance phase. The
basic output of the model is the information for drawing the distance-elapsed time
diagram of the irrigation cycle, showing the advance and recession curve and provid-
ing the opportunity time versus distance. The program has advanced developed user
interface. The design and management approach which governed the design of the
structure of FURDEV is based on the notion that a design and management scenario
must be able to “maximize” application efficiency ( E a ), given the system parame-
ters, while maintaining the other two performance indices above certain threshold
levels.

3.4.11.2 SIRMOD, SIRMODII, WinSRFR

These are described in the border irrigation section.

3.4.12 Sample Worked Out Problems

Example 3.5
Furrows of 100 m length and 0.80 m width and having a slope of 0.3% are irrigated
for 30 min with a stream size of 0.005 m 3 /s. Determine the average depth of water.

Solution

×

q t

=

We know, d

W × L

Given,

L = 100 m

W = 0.80 m

S = 0.3%

0.005 m 3 /s q =

t 1,800 s

Putting the above values in equation, d

= 30 min = 30 × 60 s =

= 0.1125 m (Ans.)

Example 3.6

Furrows of 120 m length and 0.70 m width and having a slope of 0.3% are initially
irrigated for 40 min with a stream size of 0.005 m 3 /s. The stream size is then reduced
to half and continued for 30 min. The furrow end is closed (no outflow from furrow).
Determine the average depth of infiltrated water.