Rainfall and Stormwater Drainage Issues

Spring is right around the corner which means more frequent rain events and potential drainage issues. A high intensity rain event recently took place which is unusual for this time of year.  Winter season rains often result in additional standing water caused by the frozen ground combined with the soil's inability to absorb water. Although this winter season's daytime temperatures have been higher than normal, nighttime temperatures have dipped below freezing.  Due to this occurrence, it generally will take 48-72 hours after any rain event ends for the water to subside. 

Some Areas of Riverwoods Take Longer to Drain but Provide Habitat for Native Species

Riverwoods topography reflects low elevation variances resulting in stormwater taking longer to drain. A benefit of multiple lower woodland areas such as flatwoods or ephemeral pools is that they provide an essential frog and salamander breeding area. The Northern Flatwoods ecosystem is considered threatened in the Chicago Region. These seasonal pools of water provide habitat for distinctive plants and animals but don't dry out completely until late spring or early summer. 

Consider scheduling an Ecological Consultation to learn whether your property contains woodlands, wetlands, or to see if you qualify for one of the Village's Cost-Share Programs, such as Invasive Shrub Removal, Rain Gardens, Prescribed Burn, which may also assist with managing stormwater on your property. 

Contact the Village Engineer if:

• Standing water is still present in designated drainage areas 72 hours after a rain event.
• Water is entering your home and the sump pump is still functioning. 
• You are concerned that nuisance flooding is caused by adjacent properties or the Village's right-of-way.   

Stormwater Study & Residential Drainage & Flooding Questionnaire

The stormwater survey deadline has been extended to April 20.  Survey hard copies were mailed but residents may also submit their questionnaire online. Be sure to attach any stormwater photos or videos. Multiple submissions are allowed since you may observe different drainage issues depending on the rain event's severity.  These completed surveys are critical to understanding the water's day-to-day flow and help develop a clearer picture of the Village’s stormwater system.

Please contact the Village Engineer, Carissa Smith, with any questions.