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- W2032568725 abstract "ABSTRACT A field study was conducted to determine the effect of fabric wrap envelope and drain slope on the performance of a combination drainage and subirrigation system. The experiment consisted of 32, 102-mm drain tubes in four treatments of 0 and 0.2% slope with and without envelopes. Each treatment had two replications. Row rates and water table elevations were measured continuously over the four-year experiment. Data were analyzed by examining relationships between flow rate and midpoint water table elevations. An entry resistance was defined and its value calculated for 9100 observations of drain flow rate versus water table elevation midway between the drains. Results of the study showed that the effect of slope and envelope on drainage and subirrigation varied somewhat depending on field location. The fabric wrap envelope was effective in increasing subirrigation rates, but effectiveness decreased with time. Water table response to drainage was also more rapid for the envelope covered drains, in most cases, as indicated by more rapid drawdown after rainfall or subirrigation. Entry resistance was less for drains that had both envelope and slope (SE) than for any other treatment. However, resistance changed with time during the four-year experiment and head losses near the drains were high for all cases." @default.
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- W2032568725 date "1990-01-01" @default.
- W2032568725 modified "2023-09-26" @default.
- W2032568725 title "EFFECTS OF DRAIN ENVELOPE AND SLOPE ON PERFORMANCE OF A DRAINAGE-SUBIRRIGATION SYSTEM" @default.
- W2032568725 doi "https://doi.org/10.13031/2013.31356" @default.
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