CRDSS_Task1_15-16_DataManagementInterfaceToEstimateNaturalStreamflowAtNetworkNodes

• Title: CRDSS Task 1.15-16 - Water Rights Planning Model - Data Management Interface Utility to Estimate Natural Streamflow and Inflow at Network Model Nodes
• Description: This task memorandum outlines and describes the procedures of the data management interface ‎(DMI)‎ utility that will be used to estimate natural streamflow and inflow at network model nodes.
• Decision Support - Doc Type: Task Memorandum
• Date: 1/9/1995
• DSS Category: Surface Water
• DSS: Colorado River
• Basin: Colorado Mainstem
• Contract/PO #: C153658, C153727, C153752
• Grant Type: Non-Reimbursable
• Bill Number: SB92-87, HB93-1273, SB94-029, HB95-1155, SB96-153, HB97-008
• Prepared By: Riverside Technology inc.

Determine the average annual unit basin natural streamflow for each of the selected CRDSS core
?
stations:
UBD = (1 / DA ) * DIS (3)
s s s
2
where UBD is the average annual unit basin natu ral streamflow (acre-feet per mi ) for the CRDSS
s
2
core station s, and DA is the tributary dr ainage basin area (mi ) for the CRDSS core station.
s
Develop a simple linear regression relationship between the unit basin na tural streamflow (UBD )
?
s
for the CRDSS core stations and the core stations' mean basin elevations (MBE ) such that:
s
UBD = a * MBE + b(4)
n n
where UBD is the average annual unit basin natural streamflow for node n, MBE is the mean
n n
basin elevation for node n, a is the slope of the linear regression relationship, and b is the y axis
intercept of the linear regression relationship.
Using the mean basin elevation for the model node of interest and the regression relationship
?
(equation 4), determine the average annual unit natural streamflow for the model node, UBD .
n
Then, using the tributar y drainage area for the subject mode l node, determine the average annual
natural streamflow:
DIS = DA * UBD (5)
n n n
where DIS is the average annual natural streamflow (acre-feet per year) for node n, and DA is the
n n
2
drainage area (mi ) tributary to the node of interest.
Determine the monthly time series for natural str eamflow at the model node of interest using the
?
selected CRDSS core station:
NATFLW = ( NATFLW / ANLFLW ) * DIS (6)
n,m s,m s,y n
where s is the CRDSS core station selected to di stribute the average annual natural streamflow at
the node of interest into a monthly time series. For each year, y, of the study period, there will be
12 values (m equals 1 through 12) of NATFLW for model node n.
Determine the time series for total upstream na tural streamflow for immediate upstream inflow
?
nodes:
N
UPNAFLW = NATFLW (7)
j n,j
n=1
where UPNAFLW is the total upstream natural streamflow for the current month j, and N is the
j
total number of immediate upstream inflow nodes including inflow nodes on tributaries. The
figure below illustrates the immediate upstr eam inflow nodes for calculating UPNAFLW.
5
A275 01.09.95 1.15-16 Hyre, Fosha