(S (S (NP (BASENP (JJ Geological) (NNS studies)) (PP (IN of) (NP (NP (BASENP (DT the) (NN area)) (VP (VP (VBN affected) (ADVP (RBS most))) (PP (IN by) (BASENP (NN erosion))))) (PRN (COMMA ,) (BASENP (NNP Anambra)) (COMMA ,))))) (VP (VBP have) (VP (VBN concluded) (SBAR (IN that) (S (NP (BASENP (DT the) (NN cost)) (PP (IN of) (S (VP (VBG implementing) (NP (BASENP (DT a) (NN project)) (SBAR (WHNP (WDT which)) (S (VP (MD could) (VP (ADVP (RB effectively)) (VP (VB slow) (BASENP (NN erosion)))))))))))) (VP (VBP are) (VP (VBN estimated) (PP (IN at) (BASENP (QP (DOLLAR US$) (NN 2) (NN billion))))))))))) (PERIOD .))