Section 62 Reservoir Release File 1/29/02 The XXXREL File

section 6.2 reservoir release file 1/29/02 the xxx.rel file has the reservoir locations and releases. 3 90 1 4843 554 0.00000 0.0

Section 6.2
Reservoir Release File 1/29/02
The XXX.REL file has the reservoir locations and releases.
3 90 1
4843 554 0.00000 0.00000 0.00000 0.00000 0.00000 Belwood
4836 523 0.00000 0.00000 0.00000 0.00000 0.00000 Conestogo
4827 559 0.00000 0.00000 0.00000 0.00000 0.00000 Guelph
4.900 9.940 4.400
4.900 9.940 4.400
4.900 9.940 4.400
.
.
.
46.300 94.700 60.000
46.300 94.700 60.000
46.300 94.700 60.000
46.300 94.700 60.000
The first number is NR, the number of reservoirs and lakes; the second
is NHR, the number of hours of release information; and the third
number is the time step, which has to be the same as the time step for
the streamflow information. (This is automatically taken care of when
a new event is initiated).
The next NR lines give the locations, operating rule and name for each
reservoir. The location is in UTM coordinates. The operating rule has
to be pro­grammed for each individual reservoir but five parameters
are reserved for this purpose. In the current version of SPL9, the
releases are externally determined and entered by way of the WATFLOOD
menu. The remaining values are the releases in cms. Values are not
required for each time step. If there is a negative value, the last
positive value is carried forward by the program.
IRES JRES B1 B2 B3 B4 B5 comment
4843 554 0 0 0 0 0 SHAND
4836 523 0 0 0 0 0 CONESTOGA
Format: 2I5, 5g10.3
IRES and JRES are the coordinates of the reservoir outlet structures.
B1 to B5 are parameters available for a reservoir or lake routing
relationship if the releases are not read in.
Lake Routing
A lake can be modelled using a two step procedure. First mark each
grid that is part of a lake with a reach number in the map file.
Number the lakes from 1 to the number of lakes. If a lake covers all
or part of multiple adjoining grids, mark each grid touched by that
lake with the same reach number. Reservoirs with controlled outlets
should also be marked as lakes and should be placed ahead of the
naturally controlled outlets. See Section Error: Reference source not
found for an example of setting up the reach numbers in the bsnm.map
file. Once the lakes have been located, the outlets should be located
in the outlet grid and entered into the yyddmm.rel file as shown in
Sect. Error: Reference source not found.
Water is routed through the lakes using a user-specified function.
Either a power function

or a polynomial like

must be used. If b3, b4 and b5 =0.0, a power function with
coefficients b1 and b2 is assumed. If b3 or b4 or b5  0.0, a
polynomial is assumed. For the latter, b3 must have a value although
b4 and/or b5 can be 0.0. However, it is very important that the
coefficient of the highest order term is +ve.
If a power function provides the best fit, only the first two
parameters are used (B1 and B2). If a polynomial is used, it must be a
3, 4 or 5 parameter polynomial. It is important that the polynomial be
monotonically increasing and that it does not dip down after the last
point. For this reason, the coefficient for the highest order term
must be positive. A 3rd, 4th or 5th order function can be tried and
the best one meeting these requirements can be chosen. Sometimes extra
points added to the data set can be used to force the function to
behave. The function MUST be plotted to ensure is monotonically
increasing and passes through the origin (0,0) of the graph.
An example input file is shown below.
Below is an example for Tabacco Creek for a watershed with any farm
ponds. An Excel spreadsheet is used to fit polynomials or power
functions to each of the storage-discharge curves.

Figure 6.1 Example of a storage-discharge curve (Subbasin 55 below)
(Please note that the order of the terms is reversed below)
Example yyyymmdd.rel file:
22 744 1 y
5462 545 6.051E-05 1.265E-09-4.103E-13 1.397E-17 0.000E+00 Subbasin 56
5462 548 5.947E-06-9.931E-11 1.079E-15-1.223E-20 7.798E-26 Subbasin 55
5462 549 4.062E-10 4.800E-10-1.711E-14 1.732E-19 0.000E+00 Subbasin 53
5463 545 1.502E-04-2.096E-08-1.258E-12 5.765E-17 5.464E-20 Subbasin 50
.
.
5469 545 3.720E-04-1.505E-07 2.722E-11 0.000E+00 0.000E+00 Subbasin 13
5471 542 2.290E-02 2.212E-01 0.000E+00 0.000E+00 0.000E+00 Subbasin 5
5471 544 3.334E-08 1.537E+00 0.000E+00 0.000E+00 0.000E+00 Subbasin 6
5471 545 1.131E-04-1.711E-08 1.515E-12-8.503E-17 2.418E-21 Subbasin 4
For controlled reservoirs, the releases must be entered in the
resrl\yymmdd.rel file. The controlled reservoirs are indicated by b1
and b2 = 0.0 in the header of the yymmdd.rel file.
For geographical coordinates, the lake or reservoir locaton is given
in minutes as for the Ticino River in Italy:
1 24 1
2744 516 0.100E-09 1.75 0.000E+00 0.000E+00 0.000E+00 Maggioro
fln = Section 6.2.doc