DERIV: a computer program for calculating pressure derivatives for use in hydraulic test analysis

DERIV is a computer program to transform pumping test, slug test data and associated type curves to derivative format. The quantitative and diagnostic analysis of constant-rate pumping tests and slug tests can be interpreted by the use of hydrologic test analysis for the computation of pressure derivatives. The use of DERIV helps to transform slug test data into pumping test responses and also to eliminate noisy test data.