PUBLICATIONS--Report "Design criteria for a water-quality sampling network to assess the effects of nonpoint sources of pollution,
based on data from the Susquehanna River Basin, Pennsylvania and New York"



                                             October 26, l978


QUALITY OF WATER BRANCH TECHNICAL MEMORANDUM NO. 79.04

SUBJECT: PUBLICATIONS--Report "Design criteria for a water-quality
         	sampling network to assess the effects of nonpoint 
         sources of pollution, based on data from the Susquehanna
         River Basin, Pennsylvania and New York", by D.J. Lystrom

The enclosed report by D. J. Lystrom describes the suitability of 
available data for defining the effects of nonpoint sources of 
pollution on water quality in the Susquehanna River basin. Other 
products of the same study were distributed by Quality of Water 
Branch Technical Memorandums 70.08 and 78.15.

This report focuses on design of a water-quality data network 
through a two-step process consisting of: (l) regression analysis 
relating dissolved solids and suspended sediment loads to basin 
characteristics, and (2) determination of whether an increase in 
data collection, either in time or space, would add materially to 
the accuracy of the estimated load values. Director's approval has 
been received for publication of the report in the World 
Meteorological Organization's Casebook on Network Design Practice.

Please circulate the report to your personnel as you deem 
appropriate. Additional copies can be obtained from:

           D. J. Lystrom
           USGS National Center MS 415
           Reston, VA 22092



                            R. J. Pickering 
                            Chief, Quality of Water Branch

Enclosure

WRD Distribution:  SL 
  (With attachments)
  Assistant Chief Hydrologist, R&TC
  Regional Hydrologists, NR, SR, CR, WR
  Regional Research Hydrologists, NR, SR, CR, WR
  District Chiefs, WRD (2 copies each)