Chester Cheng explains the Enviroscape to TMHS students

Tewksbury DPW GIS Project Manager Chester Cheng explains the Enviroscape to TMHS students, a 3D diorama which shows how stormwater makes its way to streams, rivers and ponds in the community. (courtesy photo)

TEWKSBURY — Stu­dents in the Environ­men­tal Science class at Tewks­bury Memorial High School had the chance to hear first hand from the town’s stormwater management project manager Arthur Markos and GIS project manager Ches­ter Cheng about the impact that runoff can have on local water sour­ces and greater watershed, and the new storm­water management ac­tivities the town has re­cently undertaken.

This is the third year Markos and Cheng have visited TMHS. The pair gave students a glimpse into their educational back­grounds and job re­sponsibilities as well as showing them the importance of good stormwater management.

The Environmental Sci­ence class is taught by Janet Gordon, and students learn about the impact of humans on the environment. This im­pact includes the effects of human behaviors on natural resources, both biotic (living things like plants and animals) and abiotic (non-living things like air, soil and water).

Gordon teaches a unit about water resources and discusses how pollutants enter our waterways and the effect they have on natural habitats and on drinking water.

“Part of the discussion includes how water flows when precipitation falls and whether it filters into groundwater reservoirs or enters the nearest waterway,” said Gordon. 

Gordon explained, “Storm­water, in particular, can flow into the catch basins in Tewksbury's streets and carry pollutants with it into the very same place from which we draw our drinking water, the Mer­rimack River.” 

Pollutants can include ex­cess lawn fertilizer, mo­tor oil, animal feces or im­properly disposed house­hold chemicals. The DPW has a comprehensive storm­water information guide at

As part of their presentation, Chen and Markos discussed the town’s stormwater management program and explained what the Engineering De­partment and DPW are doing to fulfill the En­vironmental Protection Agency’s National Pollu­tion Discharge Elimina­tion System (NPDES) MS4 permit which is required by the federal government for all municipalities.

According to the DPW webpage, the Town of Tewksbury’s Stormwater Management Program consists of public education, illicit discharge de­tection, system mapping, water quality testing, construction site runoff control, and good housekeeping practices.

Part of the discussion and demonstration centers around the Enviro­scape, a diorama that the town purchased to help bring a visual component to the public. The 3D mo­del lets the students see firsthand how precipitation carries pollutants along as it flows into catch basins and, from there, into local streams and rivers.

Said Gordon, “the students learn that, contrary to what many adults be­lieve, town catch basins do NOT carry stormwater into a wastewater treatment plant.  They learn that by following town guidelines for stormwater management, they can help protect aquatic environments and a precious natural resource upon which they depend, fresh water.”

About the class, Markos said, “We gave tips on ways they and their families can help keep storm­water clean around their homes,” explaining that students were very en­gaged. “The students had interesting questions about careers in science, engineering, Geo­graphic In­formation Sys­tems, city planning and what it’s like to work for a municipality.”

The Town of Tewksbury passed a stormwater fee at the October 2019 Town Meeting, necessary to fund the infrastructure im­prove­ments needed to comply with the federal government’s requirements. The unfunded mandate requires all cities and towns to document outfalls, perform outreach, inspect water pipes for leaks, and create a number of action plans for all town buildings and stormwater pollution plans for the parks and DPW.

Markos and Cheng are available to bring the En­viroscape to schools and civic organizations, and provide an educational program. They may be contacted at or by calling the DPW at 978-640-4440.

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