Even with simplifying assumptions such as dealing with coliform bacteria in 

 terms of most probable number, important bacteria and virus detrimental 

 features are glossed over. The most probable number count of coliform bacteria 

 is and has been used as an indicator of presence of bacteria hazardous to health. 

 However, the coliform number and pounds of BOD are most useful for integrating 

 the large number of water-using activities into some simplified decision-making 

 oriented model. 



As disappointing as the omission of nitrate and phosphate nutrients is the lack 

 of information on pollution effects of outboard motors. There are two features 

 of boating use, one detrimental and one beneficial. The operation of a motorboat 

 does two things: (1) it deposits engine wastes in the water body— this is detri- 

 mental-and (2) at the same time the swirling propellors and wave action resulting 

 from outboard motors has an aeration factor for replacing dissolved oxygen in 

 the water body. 



A.3 Size of Lake Bodies and Shoreline Lengths 



The size of water bodies was taken directly from the materials published by 

 the New Hampshire State Planning Office, then under the Department of Re- 

 sources and Economic Development, Concord, N.H. Lakes were assumed to 

 have an average depth of 10 feet. Lakes in the model were aggregated into one 

 big lake having so many square acres of surface water, so many acre-feet of 

 water, and so much shoreline length. Lakes of the size of less than 10 acres were 

 not included. 



Lakes due to impoundments for flood-control purposes, such as the Surry 

 Mountain Dam, by nature differ from other lakes and hence were treated as a 

 different body of water of specified size, depth, and shoreline length. 



A.4 Determination of Benefits Used in the Model 



The determination of benefits related to water use is notoriously difficult to 

 do. For many uses, there does not exist a per-unit price for some specific water 

 use. However, for other uses, specific price or return data are available. These 

 costs and prices were included in the respective activities in the model. Activities 

 for the non-price benefits were included in the model, subject to valuation by 

 the model. 



Returns to water users and industries that influence water quaUty and 

 quantity were based on the value-added concept. For agricultural purposes, the 

 value added was developed from farm accounting service records. For industrial 

 use, the value added was developed from the Census of Manufacturers for the 

 state of New Hampshire. For recreational campground enterprises, estimates 

 were obtained from How to Plan the Recreation Enterprise, Cooperative Exten- 

 sion Service, University of Maine, Orono, Maine, Circular 396, February 1968, 

 by Francis E. Montville. For park and day use, charges at the nearest state park 

 were used for pricing. 



Vacation cottages provided one of the most difficult items to measure. For 

 determining vacation cottage value, an indirect concept was used. The basic 

 concept was as follows: the cost of owning a vacation cottage on a monthly (or 

 annual) basis must equal or exceed the benefits derived from holding the 

 vacation cottage; otherwise, no new cottage would be built, nor would the 

 individual own the cottage. This value was determined from real estate trans- 

 actions and listings in S trout Real Estate Catalog plus the annual tax computed 



69 



