2.5 Hydrologic Systems

The Department of Natural Resources’ Public Waters Inventory identifies four basins within the Christmas Lake subwatershed as under the jurisdiction of the DNR (see Figure 10).  These include Christmas Lake, Como Lake and two unnamed wetlands. 

Table 2.  Public Waters in the Christmas Lake subwatershed.

DNR ID #

Name

27-137P

Christmas Lake

27-145P

Como Lake

27-892W

Unnamed

10-131W

Unnamed

Source: Minnesota DNR.  See Figure 10.

The HHPLS included detailed modeling of the current and 2020 hydraulic and hydrologic conditions in the subwatershed.  That modeling includes the following results for modeled locations (lakes, ponds, channels, and crossings) within the subwatershed:

  • Existing Normal Water Level;
  • Existing High Water Level, peak discharge, and peak velocity for the 1.5 year, 24-hour and 100-year, 24-hour events;
  • 2020 predicted HWL, peak discharge, and peak velocity for the 100-year, 24-hour event; and the
  • Existing High Water Level for the 100-year, 10-day snowmelt event.

Those detailed results are not reproduced here, but are incorporated by reference.  The HHPLS model predicted no significant increase in high water levels or peak discharges between current conditions and expected 2020 conditions.  However, some landlocked subwatershed units are present, as well as numerous pocket wetlands that local plans indicate may in the future be connected or drained. 

Table 3.  Modeled peak discharge from the Christmas Lake subwatershed (cfs).

Event

Existing

2020

Snowmelt

1.5 year, 24 hour

0.8

-

-

100 year, 24 hour

2.2

2.3

-

100-year, 10-day

-

-

4.9

Source:  2003 MCWD Hydrologic, Hydraulic, and Pollutant Loading Study (HHPLS)