Opinion by
Smith, J.,The plaintiff, in her declaration, avers that she is the owner of a two story brick dwelling house situate on the north side of Windsor street in the city of Reading; that prior to the year 1889 a natural water course drained all surface waters without overflowing her land; and that in 1889 the city authorities built a sewer, which was inadequate to drain the watershed, and at the same time filled up the natural water course, whereby the water overflowed her premises several times, damaged the dwelling and its contents, and diminished the market value of the property. This suit was brought to recover for the injuries thus suffered.
On the trial, the plaintiff’s right to recover was restricted, practically, to injuries caused by the obstruction of the natural water course and the consequent diversion of the water to and *363upon her premises, and. the jury were told that no recovery could be had for any injury caused by the insufficient size or capacity of the new sewer. The obstructions complained of were twofold: (1) the new sewer, which it is alleged was so placed as to obstruct the passage of the water where it had been accustomed to flow, and (2) the filling up of the natural water course at a point on Spring street north of the plaintiff’s land, which, it is alleged, caused the water to overflow her lot. It was also contended, on the argument, that the evidence showed that a plan known as Bassett’s System had been adopted by councils for the sewerage of the whole city, and that if it had been carried out in a methodical manner, with due regard to the changes and the passage of the water as contemplated by the new plan, other parts of the system would have been first built, and the greater part of the water diverted to the plaintiff’s lot would have been carried off in other directions, as intended, through the enlarged system; and that the defendant was therefore negligent in not constructing, the sewer so as to avoid overtaxing the part built near the plaintiff’s land. But this view was not declared upon nor submitted to the jury for their consideration, and there is nothing in the record to warrant the assumption that it entered into the basis of their finding. It was admitted that neither the whole system nor the part which it was alleged would relieve the Nicolls street sewer had been built at the time of the injuries complained of, nor at the time of the trial in the court below. On the question of damages, the learned trial judge told the jury that compensation such as would make the plaintiff whole was the correct rule, and that in estimating the damages to the building they were to consider and allow for the difference in its market value before the injury, and after, as affected by the injury; and referred them to the opinions of the witnesses, on this point.
The evidence, with the map of the district, shows that the sewer complained of crosses the water way at Spring street at nearly right angles, and three feet below its bed, but does not follow the bed of the water course or occupy any part of it between Spring and Olqy streets. So that, under the facts it is not the case of the conversion of an old water course into an artificial sewer, as in Collins v. Philadelphia, 98 Pa. 272; nor was the iniury necessarily caused by the inadequacy of the *364sewer, as in Fair v. Philadelphia, 88 Pa. 809. It may be that the city authorities intended the new sewer as a substitute for the water way, and that the water should be diverted to it from the latter; but that does not bring the case within the facts in Fair v. Philadelphia. In that case, an existing sewer was overtaxed through an extension of the system, thereby causing a larger volume of water to flow through it. None of the water which accumulated on the premises of the plaintiff in that case was thrown there by reason of the construction of the new sewer, or the diversion of the water from its old course; the damage was done by water which had been accustomed to flow there, and could not get into the sewer because it was already filled. In the present case it is contended, on behalf of the plaintiff, that without regard to the capacity of the new sewer running south on Nicolls street, if the water way running west on Spring street had not been filled up at its intersection with Nicolls street, no damage would have been done to the plaintiff’s property.
The liability of the city is denied because (1) it had a right to adopt and construct a system of drainage for the city, and the inadequacy of the sewer on Nicolls street to take all the water from Spring street was an error of judgment; and (2) the old water way was filled up by abutting lot owners and not by the city; and also that the flooding of plaintiff’s property on August 23, 1891, was due to an extraordinary fall of rain.
It must be conceded that the power of a municipal corporation to construct sewers is discretionary and in its nature judicial, and that no civil liability is incurred for failure to perform it; nor for errors of judgment in its exercise, such as selecting plans, locations, etc., although the sewers constructed pursuant thereto prove inadequate. But the work of construction in accordance with adopted plans is purely ministerial; it must, therefore, like all ministerial duties, be performed in a skillful and careful manner; and the municipality is liable for injuries caused by its negligent performance: 24 Am. & Eng. Ency. of Law, 946, where numerous authorities are cited.
While a city has absolute power over its streets, its control of them must be exercised with a due regard for the rights of abutting property owners. If, as alleged by the plaintiff here, water which formerly flowed north of her property along Spring *365street, in a natural channel sufficient to carry it off, was diverted by the city authorities, and thereby overflowed her lot, the city would be liable for damages resulting from such diversion, and her right to recover would not be affected by the circumstance that the Nicolls street sewer, inadequate when constructed, might prove adequate upon the completion, at a future day, of a general sewerage system. In regulating the flow of surface water on the streets, municipalities have no right to cast it upon adjacent property: Borough of West Bellevue v. Huddleston, 28 W. N. 240; Elliott v. Oil City, 129 Pa. 570; Torrey v. Scranton, 133 Pa. 173. And that water thus diverted must first pass over the intervening land of others will not affect the question of liability: Wier v. Plymouth Borough, 148 Pa. 566.
Of course the ground of the defendant’s liability is negligence ; want of care in the discharge of its ministerial duties, through which the property of others is injured. If in this case there was no negligence on the part of the city authorities, in obstructing or diverting from its natural channel the water that caused the injury; or if there was no such channel; or if the water which flooded the plaintiff’s house was the ordinary surface water, not cast there by any wrongful act of the city; or if it was from an extraordinary flood; or if it was driven there because of the inadequacy of the sewer constructed by the city; or by reason of the natural passage way being filled up or blocked by any person other than the city authorities; or if the plaintiff by any act of hers contributed to the cause of the injuries ; there would be no liability on the part of the defendant.
The witness S. S. Hoff having testified in chief that by filling up on Spring street, at its intersection with Nicolls, the ditch was cut off and any excess of water not entering the sewer, would flow down Nicolls street, it was error to exclude, on cross-examination, the question made the subject of the seventh assignment. The defendant had a right to show by the witness, if it could, that notwithstanding that filling, the water coming down Spring street would be discharged through the water course. This assignment is sustained.
The question upon which the sixth assignment is based assumed as facts matters not touched upon by the witness in his examination in chief; it was rightly excluded as not proper on cross-examination.
*366The assignments of error from the ninth to the fifteenth inclusive, and from the seventeenth to the nineteenth inclusive, relate to the question of damages, and may be considered together. Several witnesses were permitted to state what in their opinion was the market value of the property before and after the several inundations from 1891 until suit brought; and the difference was held the proper measure of damages to the real estate. In this we think there was error. None of the plaintiff’s real estate was taken for any public use by the defendant. The property was not wholly destroyed, or irreparably injured. It appears that the plaintiff and her family continued to reside in the house, notwithstanding the floods, and, with the exception of the cellar, used it as before the diversion of the water. If, therefore, the defendant is liable at all, it is for such injuries only as were done to the property; and the measure of compensation would be the cost of repairing the damages and thus restoring the property to its former condition, unless such cost would equal or exceed the value of the building, in which case the value of the building would be the measure of the plaintiff’s damages: Lentz v. Carnegie, 145 Pa. 612; Eschleman v. Township, 152 Pa. 68. These assignments are sustained.
A physician called on behalf of the plaintiff testified that the house was in a bad sanitary condition, detrimental to health, and that it would breed disease. But he did not say that during the four years referred to anjr disease or sickness was caused by its alleged unsanitary condition. On the other hand it appears from the plaintiff’s own testimony that she and her family continued to reside in the house, and were obliged to vacate the premises only for a short time in 1891, and then by reason of the overflow. When asked by the defendant’s counsel as to the sanitary condition of the house and its effect on the health of herself and family, her attorney’s objection to the question was sustained. It is quite reasonable to presume that her counsel would not have objected to this question if she had been able to show that any member of her household had been made ill or was at all affected by the unhealthful condition of the house. We thus have the fact refuting the theory. It was error to admit this testimony of the physician, but having been admitted, it was unfair to the defendant to exclude the question'to the plaintiff on the same subject. It *367was not alleged in tbe declaration that the house was made unsanitary or unhealthful as a place of abode, or that the plaintiff or any member of her family was made ill by reason of the flood or of the deposits in the dwelling, nor that any loss or injury was sustained by the plaintiff or her family because of its unhealthful condition. The matter was not material and formed no part of the issue raised by the pleadings. It was, therefore, erroneous to admit testimony concerning it. The sixteenth assignment is sustained.
The offers of testimony set out in the twentieth and twenty-first assignments were pertinent to the issue and material, and the testimony should have been admitted.
The plaintiff claimed damages for alleged permanent injuries to both the real and personal property, and gave evidence in support of her claim. If the injuries were of a permanent nature their presence and character would to some extent at least be visible at the time of the trial, and their lasting effect could be estimated at that time with some degree of certainty. The testimony of the witness Beard was admissible to meet the allegations of the plaintiff as to permanent injury to the property, to describe its general condition at that time, and to show how it was affected by the floods, as distinguished from wear by use during the preceding four years. Its effect was for the jury.
For the reasons given the judgment is reversed and a venire facias de novo is awarded.