Difference between revisions of "Surface water and groundwater quality impacts from stormwater infiltration"
m |
m |
||
| Line 2: | Line 2: | ||
<!-- | <!-- | ||
| + | ==Groundwater== | ||
| + | There have been many studies of the impact of stormwater infiltration on groundwater quality. Some of these studies are summarized. The [[Surface water and groundwater quality impacts from stormwater infiltration#Conclusions - groundwater|Conclusions section] provides an interpretation of these studies. | ||
| + | |||
| + | ===Conclusions=== | ||
| + | *Heavy metals | ||
| + | **Heavy metals are typically present at low levels in urban stormwater and are generally retained in the upper soil layers via adsorption to solid particles. | ||
| + | **Eventual breakthrough can occur due to the finite sorption capacities of the soil media. | ||
| + | **Periodic replacement of the upper soil layer within infiltration systems will maintain low soil concentrations and decrease the potential for contaminating groundwater. | ||
| + | *Organic compounds | ||
| + | **Because of the diversity of organic compounds, it is difficult to generalize, but typically these are at low concentration in stormwater runoff. | ||
| + | **Many compounds are attenuated within the infiltration media, where they may be degraded or immobilized. | ||
| + | **BMPs with little or no organic material, particularly underground practices, may present some risk if concentrations of organic chemicals are elevated in stormwater runoff. | ||
| + | *Nitrate | ||
| + | **Although nitrate is poorly attenuated in most infiltration BMPs, concentrations in stormwater are generally low, resulting in low risk to groundwater. | ||
| + | *Phosphorus | ||
| + | **Phosphorus is strongly attracted to solid particles and the resulting risk to groundwater is low. | ||
| + | *Chloride | ||
| + | **Chloride is not attenuated within infiltration systems | ||
| + | **Chloride may present a concern for groundwater where concentrations are high in stormwater runoff. This occurs in areas where application of choride-based deicers if high, such as major transportation and high density commercial areas. | ||
| + | *Pathogens | ||
| + | **Concentrations of pathogens in stormwater runoff are often high | ||
| + | **There is limited information on fate and transport of pathogens through infiltration systems | ||
| + | **Infiltration practices that utilize media with organic matter are likely to be most effective in attenuating pathogens, while systems with little or no organic matter, particularly underground systems, are less effective. | ||
| + | |||
| + | |||
| + | ===Literature review=== | ||
| + | *Weiss et al., 2008. This paper, [http://www.pca.state.mn.us/index.php/view-document.html?gid=7732 Contamination of Soil and Groundwater Due to Stormwater Infiltration Practices - A Literature Review], provides a review of dozens of articles from peer-reviewed scientific and engineering journals. | ||
| + | |||
| + | |||
| + | |||
| + | |||
| + | |||
| + | |||
| + | |||
==Related pages== | ==Related pages== | ||
*[[Overview of stormwater infiltration|Overview]] | *[[Overview of stormwater infiltration|Overview]] | ||
Revision as of 16:40, 29 July 2015
Information: Coming soon: we anticipate populating this page in August, 2015