WSPC03939

• File Number: 8460.500
• Description: Platte River Basin - Endangered Species Issues - South Platte Recovery Program
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 12/5/1995
• Author: Matthew J Cook
• Title: South Platte Agreement - Groundwater Recharge as Augmentation for Restoring Wetlands Along the Central Platte River Nebraska - Final Report
• Water Supply Pro - Doc Type: Report/Study

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

UOOiiBZ

in CFS was plotted over the full time period of 35 days and is illustrated in Figure
12a.

Return Flow to Platte River
from Rectangular Basin

ii)0.04
u.
U
_0.03
~
.!:l 0.02
u.
"
100 0.01
::l
~ 0

o 5
101520
25 30 35
Time (Days)

Figure 12a: Return Flow to Platte River due to Recharge

The return flow showed a steady increase during the recharge period. The
maximum return flow occured at 25 days, five days after recharge was
terminated. This maximum return flow value was 0.0388 CFS. The overall
return flow to the river was found by integrating the return flow curve over the
entire time period of 35 days. The total return flow for the 35 day period was
71,224.6 cubic feet This represents 17.1 % of the total water recharged of
416,966 cubic feet The trend of Figure 12a suggests that the return flow would
continue well past the 35 day extent of the plot The continuing return flow past
the 35 day point is illustrated in Figure 12b. The overall return flow was again
calculated by integrating the return flow curve over the 75 day time period. The
total return flow increased to 133,607 cubic feet This represents only 32% of
the total water recharge. It is evident that the return flow to the river would
continue until the groundwater mound was fully dissipated.

H

...~