Hawks Landing Flood Mitigation

Last Updated: 11/11/2019

Construction Update

All of the storm box is installed up to the intersection of Hidden Hill and Shadow Wood and re-connected to the existing storm sewer.  The road, sidewalk and drive aprons have been installed. The contractor still has to install temporary seeding and matting. This will complete Phase I for 2019.

In 2020, the contractor will resume installation of the new box to the south.

Project Background

Hawks Landing is a residential development located on the far west side of Madison at the northwest quadrant of South Pleasant View Road (CTH ‘M’) and Midtown Road. Construction of the development began in 2001. The development includes approximately 300 homes and an 18-hole golf course, the Hawks Landing Golf Club.

Hawks Landing has six (6) stormwater control ponds, all located within the golf course. Three of these ponds (LBMC North, LBMC SW, and LBMC East Ponds) are located on the west side of the course and drain to Lower Badger Mill Creek (LBMC), and three (UBMC North, UBMC SE, and UBMC SW Ponds) are located on the east side and drain to Upper Badger Mill Creek (UBMC).

Project Description

The west side of the development, as shown in Map 1, experiences drainage problems during large storm events. Lots 169, 170, and 250 experience flooding during events, with the highest water levels and highest flows occurring on Lot 170. In September 2016, the City contracted with MSA Professional Services, Inc. to conduct a drainage study for the western portion of Hawks Landing, the area roughly bounded by Eaglewood Drive on the north, Breezy Trail on the east, Mid Town Road on the south, and Shady Point Drive on the west. Map 2 identifies shows the delineated watersheds and the general flow directions for the study area. Note that, for the purposes of this project, the ponds shown in Map 2 have been assigned alphabetic identifiers:

  • LBMC SW Pond (Map 1) = Pond C (Map 2)
  • LBMC North Pond (Map 1) = Pond D (Map 2)
  • LBMC East Pond (Map 1) = Pond E (Map 2)

Flooding downstream from Pond C is due in part to observed plugging of the pond outlet structure; however, significant additional contributors to flooding are discharges from upstream ponds (Ponds D&E on Map 2) which appear to be much greater than originally planned. In Fall 2018, Hawks Landing Golf course constructed an additional dry detention basin to the east of Pond C to reduce peak inflow into Pond C. Additionally, the City of Madison has contracted with MSA Professional Services, Inc. to design a hydraulically-improved outlet from Pond C. The current elliptical outlet pipe shall be upsized to a 4'x8' concrete box culvert, which will drain Pond C to a newly-constructed drainage ditch south of Shady Point Dr. This new design should alleviate flooding during large events out of Pond C and in the intersection of Hidden Hill Dr and Shady Point Dr. The City intends to post plans for this project for bid in early June. Once they are available, a link will be provided on this website.

In addition to Hidden Hill Dr and Shady Point Dr, flooding occurs in the north part of the neighborhood as well, north of intersection of Hill Creek Dr and Grassy Hollow Dr. This flooding is due in large part to runoff from the undeveloped farm field north of the Hawks Landing neighborhood; the runoff from the field, which is substantial, also contributes to the flooding problems at Pond C and the intersection of Hidden Hill and Shady Point. The City has contracted with MSA Professional Services, Inc. to investigate solutions to this flooding problem. Currently, the City is investigating the purchase of some of the farmland and construction of a swale to drain water from the intersection of Red Tail Dr and Hill Creek Dr.

Public Informational Meeting

The City hosted a Public Informational Meeting on May 28, 2019 at Blackhawk Church (Brader Way) to discuss fixes at Hidden Hill Dr/Shady Point Dr and north of Hill Creek. The meeting Powerpoint is here: Hawks Landing Flood Mitigation PIM - May 28, 2019.

Public Works Improvement Project

The City of Madison will begin construction on the Hawks Landing Flood Mitigation South (2019) in early September 2019. This project will include the removal of an existing 43”x68” horizontal elliptical reinforced concrete pipe (HERCP) storm sewer between Pond C on the Hawks Landing Golf Course and the corner of Hidden Hill Dr and Shady Point Dr in Madison. The removed pipe will be replaced by approximately 500 lineal feet (LF) of 4’ rise x 8’ span reinforced concrete box culvert (RCBC). Additional work will include (but not be limited to) the replacement of the Pond C outlet structure, installation of two large underground concrete vaults at the southwest corner of Hidden Hill Dr and Shady Point Dr, removal and replacement of two inlets and a reinforced concrete pipe that crosses Shady Point Dr, realignment of storm sewer and other utilities within the intersection of Hidden Hill Dr and Shady Point Dr, patching of the affected street, and restoration of all disturbed areas. This work is intended to reduce flooding in the southwest corner of the Hawks Landing neighborhood.

A second phase of this flood mitigation project is currently planned for early 2020. One concrete vault (to be installed with the current project) will be removed and the 4’x8’ RCBC will be extended into a new wingwall and swale that will run parallel to Shady Point Dr in the farm field between Shady Point Dr and Midtown Rd. The City does not currently own the necessary land for this second phase but is working through the acquisition process. The completion of Phase II of this project should further reduce flooding risk in the southwest corner of the Hawks Landing neighborhood.

The project bid package can be found here: Hawks Landing Flood Mitigation South Construction Package.