WSPC12493 ‎(2)‎

• File Number: 8220.101.10
• Description: Colorado River Water Projects - Glen Canyon Dam-Lake Powell - Adaptive Management
• State: CO
• Basin: Colorado Mainstem
• Date: 4/1/1996
• Author: DOI-BOR
• Title: CRSSez - Annual Colorado River System Simulation Model - Overview-Users Manual - Update of 04-01-96 - With Revisions of 09-01-96 - 04-01-96
• Water Supply Pro - Doc Type: Report/Study

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Ou;)3:~6

SCREEN 4, Run Period and Hydrology

Traces, "Start Year, Dec 31"--This year is the yeal:' that
corresponds to the starting reservoir storage. It is not the
first year to be simulated, but the beginning year of known
conditions for the simulation.

Traces, "Number of Years to Run"--Number of years intc) the future
to simulate for each trace. The default value should take you
out to 2050 which is the last projected Lower Basin use year in
CONUSE.DAT.

Traces, "Number of Traces"--A trace refers to a sequence of
hydrologic years. For the historical period 1906-1990 there are
85 possible sequential traces of any length if they are wrapped
back to 1906 after 1990. When using the HYDR058.DJl.T stochastic
hydrology, normally 1000 traces are run. The stochast:ic file has
sufficient annual values to run 1000 traces for 58 years. The
number of years to run can be doubled to 116 years if the
stochastic traces are cut to 500 traces.

Traces, "Trace Step Size"--The number of years to skip in the
historical hydrology between trace starting years. St~ep size of
1 makes use of all possible hydrologic traces. It is common for
the mainframe CRSS model to run 17 traces with step size 5 to
reduce the amount of output and still generally cover most of the
hydrology luse combinations out of the 85 possible t.races. When
using the stochastic file HYDR058.DAT, the step size is 1.

Traces, "1st Hydrology Year"--This selects where tOI begin your
first hydrologic trace. It is generally of use only when
performing a single trace run for critical period analysis. When
using the stochastic hydrology in HYDR058.DAT then a 1 should be
entered.

Option List, Hydrology, "Historical Index Sequential"--Use the
historical gains in HYDRO.DAT or HYDR058.DAT in a sequential
order. This is the default and the way CRSS uses the historical
gains.

Option List, Hydrology, "Historical Random Start Year"--Perform
the historical index sequential method but randomly select a
starting year.

Option List, Hydrology, "Historical Random Selection"--For each
year in the trace, randomly select one from the historical data.

Option List, Hydrology, "Monte Carlo"--For each year in the
trace, a value is computed from a normal distributions fit to the
historical NAT and B.HOOVER values. A.HOOVER are fit to the log-
normal distribution. This method was used prior to the
construction of the stochastic HYDR058.DAT file.

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