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Abstract—Applied the OTOXI module and EUTRO module of
WASP7.2 model to carrying out forecast analysis on attenuation
condition of the main water quality control factors within second-
level protection area which delineated by experience value, took
the reality water volume of 2007 and forecast water volume of
2010, 2020 as the validating condition, demonstrated the
rationality of the second-level protection area which delineated
by experience value method. The results indicated that the
second-level protection area could satisfy industry and life water
request in 2007 and 2010, and could also satisfy the request of
living in 2020, the protection area delineation has been proved
reasonable. Further obtained the allowable maximum taking
water volume of the protection area is 145 million m3
/a through
the computation, it is suggested that the industry intake moves
when water volume which taken from the first-level and second-
level protection areas is bigger than the maximum volume, to
ensuring the quality and stability of the intake drinking water.
Keywords-WASP7.2 model; reservoir-drinking water source;
delineating protection areas; validation
I. INTRODUCTION
Recent years the raises concerns about increased drinking
water wellhead pollution make people highly be focus on
safeguarding the public water supply. The drinking water
wellhead protection plays a key role in terms of environmental
protection, socio-economic and safeguarding the public water
supply. Many methods or approaches are being used to
delineate drinking water wellhead all over the word, but exact
prediction of a wellhead protection effort is difficult because
the amount of field work required for each method depends on
how much information is already available, the complexity of
the problem area, and the degree of accuracy desired by the
wellhead protection program [1,2,3]. Drinking water wellhead
protection areas was re-delineated and approved work by the
State Council and State Environmental Protection
Administration (SEPA) in 2006. “Technical guidelines for
delineating source water protection areas” (HJ/T338-2007)
which was mandated in 2007 provided basis for drinking water
wellhead protection delineating. Wellhead protection
delineating must be accurate and easy to carry out. The
drinking water wellhead delineating combined actual
circumstance, especially for reservoir-drinking water source, is
faced with many challenges and needs further study.
Nanwan Reservoir is located from 8.5km southwest to the
city of Xinyang, Henan. Its drainage area is 1100km2


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