DRAINAGE CO-EFFICIENT FOR MOLE DRAINS TO RECLAIM DEGRADED VERTISOLS OF GODAVARI BASIN
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Authors
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A. SAMBAIAH*, M. RAGHU BABU, G. RAVI BABU, G.V. LAKSHMI and S.B.S. NARASIMHA RAO
AICRP (SAS & USW), Saline Water Scheme, ANGRAU, Bapatla - 522 101.
Keywords:
Mole drainage Co-efficient, Return period, Weibul's method, SCS-CN method, Sugarcane, Ponding, Waterlogging.Abstract
Determination of drainage co-efficient for mole drains for Kapileswarapurammandal, East Godavari district
of Andhra Pradesh was carried out by considering 26-Years daily maximum rainfall events, normal daily
rainfall, Weibul's (5-Year Return Period) rainfall event, cumulative 10-day to 1-day maximum rainfall value, best
fitting distribution (5-Year Return Period) value. Among all, Weibul's (5-Year Return Period) rainfall event and
best fitting distribution (5-Year Return period) rainfall are close to each other and hence, the observed 1-day
maximumrainfall event, which is also arrived using Weibul's method i.e. 157.0 mm of 1-day maximum event
was considered for estimation of corresponding direct runoff. An event of 157.0 mm rainfall has potential for
damaging the surface layers of the vertisols by ponding and subsurface layers by waterlogging. To evacuate
both surface and subsurface matrix for avoiding the land degradation, effective drainage systems are to be
designed and made functional. To do so, the direct runoff was estimated using SCS-CN method which is found
to be 101.4 mm needs to be drained. The difference between the 1-day maximum rainfall event and the direct
surface runoff (101.4 mm) is the abstraction amount available for preferential flow into the mole drains, i.e.55.6
mm d-1. This becomes the drainage co-efficient requirement for the mole drains of the study area, which can
be used in Hooghoudt's equation to arrive at the mole drain spacing. In this study, mathematical models were
developed for estimation of mole drain co-efficient (M.D.C.) for the study area and found that the it relates to 1-
day maximum with 2nd order polynomial equation with co-efficient of determination of 0.9911 and it relates to
return period with logarithmic equation with co-efficient of determination of 0.9869.
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