Estimation of curve number for rainwater conservation techniques
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Date
2000-01-01
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Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani
Abstract
In rainfed agriculture harvesting and management of water is of prime
importance for conserving the runoff water for potential use during the season as well
as off season. The runoff curve number method for the estimation of direct runoff
from storm rainfall is well established in hydraulic and environmental impact
analysis. It is a simple, predictable and stable conceptual model. Hence, the project
was planned to determine the precise and appropriate curve numbers for various soil
and water conservation practices for estimating curve numbers for Parbhani region.
The experiment was carried out at experimental farm at Department of Meteorology,
M.A.U., Parbhani. The rainfall data of 11 years i.e. during 1987-1999(except 1993-94
and 1994-95) recorded at the above experimental plots was considered for the study.
The 5-days antecedent moisture conditions were calculated. The maximum potential
retention and curve numbers were estimated by lognormal, least square and
asymptotic methods and compared with table values. The performance of lognormal
and least square method was par and superior to asymptotic method. The performance
of calibrated CNs and table CNs in estimating runoff on storm event basis is nearly
similar. The predictive performance of calibrated and table curve numbers was tested
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by Student ‘t’ test by using regression equation showed a non significant test for
calibrated CNs and a significant test for table CNs. The calibrated CNs were found to
be 73.59,77.59 and 90.43 for AMC-I, II and III respectively. Hence the curve
numbers for AMC-II and III were found to be nearly equal to table CNs.
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