WSPC05649

• File Number: 8062
• Description: Federal Water Rights - Colorado Litigation - National Forest ISF Claims - Technical Sutdies
• State: CO
• Basin: Statewide
• Date: 9/10/1985
• Author: Unknown
• Title: Technical Studies - Water Information Management System Handbook
• Water Supply Pro - Doc Type: Report/Study

0017112

36.2--7

WATER INFORMATION MANAGEMENT SYSTEM HANDBOOK

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(6) column 5 is not applicable.

(7) Record the QLl IQB ratio value in column 6.

(8) Multiply the QLI/QB ratio value by Qa to calculate CFS flow
for QLl and record In column 7.

(9) Calculate a time-volume coefficient for QLl' The total days in
the baseflow-duration period (in this example, 283 days) is multiplied by
the QLI/QB ratio value and by 1.9835. Record this value in column 8.

(10) Calculate the total AcFt for the baseflow period. Multiply the
TVC by QB (in CFS) and record In column 9.

e. QL2 baseflow (row labeled QL2 in ex. 3):

The QL2 baseflow component is calculated to provide an estimate of the
volume of natural flows less than QLl' The QL2 baseflow duration is
the remainin9 amount of time from.the end of QLl on the flow-duration
curVe percent time scale (In this example 91.56 to 100.06 or 8.56);

(1) Read the percent time limits from the flow-duration curve and
record in column 1.

(2) Calculate the percent time increment and record in column 2.

(3) Multiply the percent time increment by 365 days (for the number
of days in the QL2 baseflow component) and record in column 3.

(4) Round to the nearest whole day the days increment and record in
column 4.

(5) Column 5 is not applicable.

(6) Read the median percent time pOint between the beginning of the
QL2 component (that is, 91.5) and the end of the time scale (for
example, 99.99) from the flow-duratlon curve. This Q/QB ratio value
represents the average flow rate for QL2. Record this ratio value in
col umn 6.

(7) Multiply the ratio value in column 6 by.QB to produce a CFS
flow rate for QL2 and record in column 7.

(8) Calculate a.time-volume coefficient for QL2 by multiplying the
number of days duratIon in the time increment (column 4) by the ratio
value (column 6) and by 1.9835. Record the result in column 8.

i,

10 No. 1
9/1 0/8 S