![]() ![]() Like other nations making great progress, but at grips with serious economic difficulties – the cruel example of the drought occurs to everyone – like other nations that have recently assumed control of their own destiny and find themselves up against the urgent task in the present world circumstances, of developing all their resources, we trust that Upper Volta will become a model of balance, moderation, political maturity, and harmonious progress for all the strata of the population, of social justice and opening to the spiritual values of impartial religious freedom. We hope, in fact, in the wisdom of your country and its rulers. In this context, thanking you for the very kind words you have just uttered, we owe it to ourself to express our confidence in the future. Now he sends you to continue these promising relations permanently and staunchly at the Vatican. We ourself cherish an excellent memory of the visit that His Excellency General Sangoulé Lamizana paid us seven months ago. The local Church, under the responsibility of the episcopal Conference of Volta and its president, dear end venerated Cardinal Paul Zoungrana, has always engaged in dialogue with the Authorities of the State, particularly when certain present-day problems arose it will continue to do so loyally. This Mission begins, it can be said, under favourable auspices. We are happy to receive today, in the person of Your Excellency, the first Ambassador of the Republic of Upper Volta to the Holy See, and to address particularly fervent wishes to you for the success of your mission. Meanwhile, phasor diagrams based on drilling and resistivity sounding data can be used to estimate the aquifer depth.TO THE FIRST AMBASSADOR OF THE REPUBLIC OF UPPER VOLTA * The latter model is more realistic, but more scale modelling will have to be performed to permit development of viable interpretational procedures. Attempts were made to interpret the HLEM results quantitatively using two models: a three‐layer medium and a valley discontinuity. Despite the high background level of in‐phase and quadrature components, which varied with thickness and conductivity of the weathered layer, aquifers could be detected at a depth greater than 30 m. Therefore, different interpretational procedures had to be developed for granitic and volcano‐sedimentary areas. The weathered layer is a source of distinctive HLEM anomalies, which are characteristic of the underlying rocks. Of the 24 holes drilled so far, 23 are productive. During the 1980 field season, 35 target areas were surveyed. The results obtained with a multifrequency, horizontal‐loop EM (HLEM) system were satisfactory in all investigated areas. Because of the limited choice of transmitting stations reccivable in Upper Volta, the VLF method is not sufficiently sensitive to detect conductors with a strike between 45° and 105°. Our studies suggest that the task can be performed faster, cheaper and more accurately by VLF and EM methods. Traditionally, resistivity profiling has been used as the means of locating the fractured zones in the field. Because of the small size of the aquifers, a location error of 5 m can make the difference between a productive well and a dry hole. Such zones can be identified on aerial photographs, but their precise location on the ground is virtually impossible by visual means. ![]() Economic aquifers in Precambrian terrains are deep (15–50 m) and usually occur in fractured zones accompanying faults. ![]() First, a survey of available water supplies is performed. ELECTROMAGNETIC PROSPECTING FOR GROUNDWATER IN PRECAMBRIAN TERRAINS IN THE REPUBLIC OF UPPER VOLTA * ELECTROMAGNETIC PROSPECTING FOR GROUNDWATER IN PRECAMBRIAN TERRAINS IN THE REPUBLIC OF UPPER VOLTA *Ībstract The “Autorité des amenegements des valées des Voltas (AVV)” is establishing new rural settlements in the Volta valleys. ![]()
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