Young Boy (Tuutse'yoo naatse'e


(agibaa'a - Walker Lake) - (Koodaggwa - Mt. Grant)

Girls (Kin. Susua) in Tule House (Sinobe, kane)









Updated September 19, 2016

WHAT IS NONPOINT SOURCE POLLUTION: Nonpoint source generally results from land runoff, precipitation, atmospheric desposition, drainage, seepage or hydraulic modification.The term "nonpoint source" is define to mean any source of water pollution that does not meet the legal definition of "point source" in section 502(14) of the Clean Water Act. That definition states: The term "point source" means any discernible, confined and discrete conveyance, including but limited to any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal feeding operation, or vessel or other floating craft, from which pollutants are or may be discharged. This term does not include agricultural storm water discharges and return flows from irrigated agriculture.

Unlike pollution from industrial and sewage treatment plants, nonpoint source (NPS) pollution comes from many diffuse sources. NPS pollution is caused by rainfall or snowmelt moving over and through the ground. As the runoff moves, it pickups and carries away natural human-made pollutants, finally depositing them into lakes, rivers, wetlants, costal waters, and ground waters.

Nonpoint Source Pollution Can Include: Excess fertilizers, herbicides, and insecticides from agricultural lands and residential areas — Oil, grease, and toxic chemicals from urban runoff and energy production — Sediment from improperly managed construction sites, crops and forest lands, and eroding streambanks — Salts from irrigation practices and acid drainage from abandoned mines — Bacteria and nutrients from livestock, pet wastes, and faulty septic systems — Atmospheric deposition and hydromodification.

States report that nonpoint source pollution is the leading remaining cause of water quality problems. The effects of nonpoint source pollutants on specific waters vary and may not always fully accessed. However, we know that these pollutants have harmful effects on drinking water supplies, recreation, fisheries and wildlife.

Above paragraphs from Environmental Protection Agency (EPA)

Project Photos-Before & After

2015/2016 Irrigation Return Flow Ditch Project

Before Construction @ Irrigation Return Flow Ditch

Irrigation Return Flow Ditch  Restored

2013/2014 Project Construction Photos at Site-6

Before Construction  Photo @ Site-6

After Construction Photo @ Site-6

After Photo Upstream @ Site-6

View towards US Hwy 95 Bridge












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