Massachusetts
Attention!A new equation for estimating the probability of perennial flow and several new tools have been added to this application. |
StreamStats for Massachusetts can be used to estimate the long-term 99-, 98-, 95-, 90-, 85-, 80-, 75-, 70-, 65-, 60-, 55-, and 50-percent duration flows, the 7-day, 2-year and the 7-day, 10-year low flows, and the August median flow for ungaged sites (Ries and Friesz, 2000). An equation for estimating the probability of a stream flowing perennially also is available (Bent and Steeves, 2006). The reports below present the equations used to estimate the flow statistics, describe the errors associated with the estimates, and describe the methods used to develop the equations and to measure the basin characteristics used in the equations. Users should familiarize themselves with the report before using StreamStats to obtain estimates of streamflow statistics for ungaged sites.
- Ries, K.G., III, and Friesz, P.J., 2000, Methods for estimating low-flow statistics for Massachusetts streams: U.S. Geological Survey Water Resources Investigations Report 00-4135, 81 p.
- Bent, G.C., and Steeves, P.A., 2006, A revised logistic regression equation and an automated procedure for mapping the probability of a stream flowing perennially in Massachusetts: U.S. Geological Survey Scientific Investigations Report 2006-5031, 107 p., 1 CD-ROM.
The equations are applicable for most areas of Massachusetts except eastern Buzzards Bay, Cape Cod, and the Island regions, and the main branches of the Connecticut and Merrimack Rivers. Estimates obtained from the equations assume natural flow conditions at the site.
For the equations from Ries and Friesz (2000), StreamStats reports the uncertainty of the estimates for basins with drainage areas between 1.61 and 149 mi2. For equations from Bent and Steeves (2006), StreamStats reports the uncertainty of the estimates for basins with drainage areas between 0.01 and 1.99 mi2. Errors for basins with drainage areas beyond these bounds are unknown.
The “Estimate Flows Using Regression Equations” tool provides flow statistics at most any site, but better estimates of streamflow statistics generally can be obtained by using the “Estimate Flow Based on Similar Streamgaging Stations” tool if the site of interest has a drainage area that is between 0.3 and 1.5 times the drainage area for an gaged site on the same stream. The Ries and Friesz (2000) report describes the basis for implementing this method.
Interactive Map
StreamStats for Massachusetts was developed in cooperation with the former Massachusetts Department of Environmental Management, now part of the Massachusetts Department of Conservation and Recreation. Additional support for StreamStats was provided by the Massachusetts Department of Environmental Protection and the Massachusetts Geographic Information System.
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