2.5 Hydrologic Systems

The Department of Natural Resources’ Public Waters Inventory identifies numerous basins within the Painter Creek subwatershed as under the jurisdiction of the DNR (see Figure 10).  These include Katrina Lake and the following major unnamed basins:

Table 2.  Public Waters in the Painter Creek subwatershed.

Name and DNR ID #

Name and DNR ID #

Name and DNR ID #

Name and DNR ID #

Academy Marsh (27-518 P)

Unnamed (27-396 W)

Unnamed (27-522 P)

Unnamed (27-922 W)

Katrina (27-154 P)

Unnamed (27-408 P)

Unnamed (27-842 W)

Unnamed (27-924 W)

Painter (27-923 W)

Unnamed (27-513 W)

Unnamed (27-843 P)

Unnamed (27-937 W)

South Katrina (27-918 W)

Unnamed (27-519 P)

Unnamed (27-916 W)

Unnamed (27-941 W)

Thies (27-156 W)

Unnamed (27-520 P)

Unnamed (27-917 W)

 

Unnamed (27-1101 P)

Unnamed (27-521 P)

Unnamed (27-921 W)

 

Source: Minnesota Department of Natural Resources (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 that development in the lower subwatershed, particularly in subwatershed units PC-25 and 26 (see Figure 2)  that are now lightly developed, agricultural, or wooded, would increase drainage from the subwatershed unit to the creek by more than 10 cfs for the critical event, as well as flow in the creek downstream of Painter Creek Drive.   The HHPLS scour analysis identified that reach as having low erosion potential based on soils, although the Upper Watershed Stream Assessment noted several areas of bank erosion between Painter Creek Drive and CR 110 both upstream and downstream of the channel conveying drainage from PC-25.  The Stream Assessment recommended a geomorphologic analysis of the reach be completed to determine the cause of this erosion.

Table 3.  Modeled peak discharge from Painter Creek subwatershed (cfs).

Event

Existing

2020

Snowmelt

1.5 year, 24 hour

122.1

-

-

100 year, 24 hour

365.6

414.0

-

100-year, 10-day

-

-

246.7

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