*455 Opinion
Rаy Ellison, on behalf of himself and other property owners, boat owners, and taxpayers within the Portobello Maintenance District and the Ventura Port District, sued the City of San Buenaventura and the County of Ventura for injunctive relief and damages for interference with easement rights to the waterways of the districts. The trial court sustained without leave to amend demurrers to the third amended complaint for failure to state a cause of action, and Ellison has appealed the judgment of dismissal. 1
Arundell Barranca is a natural drainage-way to the Pacific Ocean serving a watershed of over 7,000 acres entirely within the county and largely within the city. The barranca empties into canals and waterways which have been designed, constructed, and dredged by the two districts to make the barranca useable by small pleasure boats of residents of the developed area and patrons of its marina. According to the complaint “The waterways maintained by Port District were crеated by dredging in 1962 and 1963. The waterways maintained by Portobello were created by dredging for Pacesetter Homes, completed in 1964. Said waterways were designed, and are used, for the passage of small boats, including those operated by plaintiff and by other property owners within Portobello. .■..”
The waterways, as constructеd, form a catch and settling basin for particulate matter flowing down the barranca. As stated in the complaint: “Until 1961, said barranca was a natural drainageway, emptying directly into the Pacific Ocean. Construction of the waterways . . . changed the terminus of the barranca so that it now empties into those waterways rather thаn flowing directly into the ocean, the waterways forming a catch basin for solid materials flowing down the barranca.” Defendants county and city are charged with having constructed streets, alleys, and drainage-ways and having permitted residential, commercial, and industrial development of property to take place within the watershed from 1962 to the present time without imposing suitable *456 controls to prevent erosion and pollution of the barranca and protect the property interests of plaintiff. Defendants county and city acted .. with knowledge that, without the proper controls on construction, said construction and development would cause erosion and the deposit into Arundell Barranca, and consequently into the waterways of Poi;tobello and Port District, of silt and debris far beyond that which would occur naturally, and far beyond that which would be the ordinary concomitant of the natural runoff of water into the barranca. ... It was foreseeable аt the time of construction of the Port District waterways that silt and debris carried down the barranca would be deposited in said waterways rather than carried out to the ocean as had occurred previously, because of the change said construction caused to the barranca’s natural condition. . . . [The] result of the uncontrolled construction of streets, alleys, and drainageways and the uncontrolled grant of building permits for the development of real property was erosion and deposit into the barranca of quantities of silt and debris far in excess of that which would ordinarily occur with the runoff of water into the barranca.”
Plaintiff аsserts that as a consequence of this periodic buildup of silt and debris in the waterways he has been subjected to increased taxation by the two districts in order to pay for dredging and maintenance of the waterways. On behalf of himself and his class he seeks injunctive relief, damages of $1 million from each defendant for the taking оf easement rights, and damages of $3 million from each defendant for trespass to property and reduction in property values.
The trial court sustained demurrers to the third amended complaint without leave to amend after finding that “the alleged damage, if any, is a consequence of run-off through a natural watercoursе and that plaintiff cannot amend his complaint to allege additional facts which would remove the case from the operation of this rule.” Plaintiff has subsequently conceded that water pollution is not involved, in that neither sewage, noxious chemicals, nor harmful bacteria have been discharged into the waterways. In substance, plaintiff charges that because defendants authorized the development of upstream properties within the barranca watershed, the water flowing into the barranca is dirtier than would otherwise be the casé and sediment builds up in the canals and waterways at a faster rate than it would without upstream development, to plaintiff’s injúiy and damage.
The parties to this litigation have briefed and focused on the issue whether the prevailing California natural-watercourse rule remains good
*457
law in the light of the 1966 decision of
Keys
v.
Romley,
The natural-watercourse rule, as set out in
San Gabriel V. C. Club
v.
Los Angeles,
The natural-watercourse rule grants immunity to upper landowners for damage to lower landowners caused by increased silt and debris.
The Weinberg Co.
v.
Bixby,
Plaintiff argues the natural-watercourse rule has been, or should be, superseded by the rule of reasonable use, under which damage to downstream landowners from the increased or reduced flow of a natural watercourse is weighed in each case against benefits to upstream landowners from the change.
Keys
v.
Romley,
For purposes of argument we assume that the rule of reasonable use applies tо both surface waters and to natural watercourses. Nevertheless, the demurrer must be sustained because plaintiff has failed to set out facts establishing defendants’ liability for damages and facts showing unreasonable use of property by defendants that would require a court to balance the benefits of defendants’ improvеments against the detriment assertedly suffered by plaintiff.
1. The first difficulty with plaintiff’s pleading is that it intermingles liability of a public entity for its own development and construction with asserted liability of a public entity for issuance of subdivision, building, and other permits for private construction and development, the latter in flat contradiction to the provisiоns of Government Code section 818.4: “A public eytity is not liable for an injury caused by the issuance ... of . . . any permit, license, certificate, approval, order, or similar authorization where the public entity ... is authorized by enactment to determine whether or not such authorization should be issued ...”
*459
Plaintiff’s only authority for the propositiоn that a public entity may be held liable for injury caused by a private development for which it has issued a permit is
Sheffet
v.
County of Los Angeles,
2. Even if we assume that plaintiff’s damages resulted from public improvements made by or on behalf of defendants and for which they can be held liable, the complaint avers nothing other than normal development and improvement of upstream property by developers and improvers acting pursuant to subdivision, construction, and building permits. Plaintiff has not pleaded any facts showing unreasonable conduсt by defendants and showing plaintiff’s inability to take reasonable precautions to avoid or reduce his potential injury from upstream development. Instead, plaintiff has merely presented a bald demand for $8 million damages against the county and city for allowing other property owners within the watershed to improve their рroperties.
In effect, plaintiff, having himself made extensive improvements to a natural waterway, having altered the barranca’s outlet to the ocean, and having dredged aftd improved a natural stream and surrounding terrain to create small-boat canals and waterways, now seeks to preclude upper landоwners from improving their property through normal development on the ground that such improvement would accelerate silting in the canals and waterways he has dredged. No facts are set out to show either defendants’ unreasonable use of property or defendants’ negligence in the authorization or constructiоn of upstream improvements. If, for example, plaintiff had alleged that in specified locations defendants had cleared and then abandoned large proprietary areas of the barranca watershed and allowed those areas to erode into gulleys which in time of heavy rain poured silt into the waterways, a cause of action might have been stated against defendants for unreasonable use of their property or for nuisance. No such facts are set out. It is merely asserted that *460 defendants knew that upstream development would cause silt and debris to enter the barranca in derogation of plaintiff’s downstreаm improvements, and that defendants could have planned upstream development differently in order to avoid -increased downstream silting. But defendants’ knowledge of the consequences of upstream improvement and their ability to prevent those consequences make up only part of the equation of reasonable use, and the complaint is silent on other factors going into the required balance of interests. What were the needs for upstream development as opposed to those for downstream development? How does the cost of prevention of increased silting compare with the damages caused by increased silting? What should be balanced in this case: each upstream development against each downstream development; all upstream development against all downstream development; part of one against all of the other? Assuming that the rule of reasonable use applies to natural watercourses, sufficient facts have not been pleaded to state a cause of action for unreasonable use.
Plaintiff relies on
Holtz
v.
Superior Court,
In sum, plaintiff seeks to turn the natural-watercourse rule upside down: he claims for himself an absolute right to change natural conditions аnd the natural flow of water in order to enjoy the pleasures of his downstream waterfront-property development, and he claims a right thereafter to freeze the new status quo and prohibit upstream property owners from effecting any changes in the now altered flow of water regardless of the expense tо upstream development. We find no basis of support for his claim in law or in reason.
*461 We conclude that plaintiff’s complaint failed to state a cause of action, either under the natural-watercourse rule or the rule of reasonable use, and the demurrer was properly sustained.
The judgment is affirmed.
Roth, P. J., and Compton, J., concurred.
A petition for a reheаring was denied August 17, 1976, and appellant’s petition for a hearing by the Supreme Court was denied October 20, 1976. Clark, J., did not participate therein.
Notes
In a footnote to his appellate brief, Ellison claims the trial court did not sustain a demurrer to a separate cause of action against the city, which alleged a municipal duty to keep the waterways of Portobello District clear of silt and debris. The record on appeal, which consists solely of the clerk’s transcript, does not confirm this claim. Moreover, the claimed vitality of the separate cause of action is inconsistent with Ellison’s request for dismissal of the entire complaint against the city and his appeal from the judgment against the city, which, if a cause of action were still pending against the city, would not be an appealable final judgment.
(Johnson
v.
Master Fan Corp.,
