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CONTENTS.

Details of work of 1907 Continued.

PAGE.

Popular opposition to storage reservoirs....

86

Proper reservoir building should be encouraged.

86

Rules by which storage reservoirs may be made attractive..

87

Proposed removal of constitutional restriction....

88

Concerning water power development in general.

89

A disadvantage of long distance electrical transmission of power

compared with local use.

90

The Indian lake reservoir

91

Storage draft from Indian lake.

94

Lumbermen's storage

97

Water power estimates

99

Gagings of Hudson at Mechanicville....

100

Check measurements of tu ne flow at Mechanicville...

100

Accuracy of measurements from Mechanicville dam..

101

Diversion for the Champlain canal..

103

Accuracy of Fort Edward gagings.

106

Gagings of Schroon river at Warrensburg.

108

Gagings of Hoosic river at Buskirk....

109

Irregularities due to Spier's Falls power plant.

110

Mass curve computations...

111

Allowance for evaporation from the reservoir surface.

112

Depletion diagram

113

Confirmation by other gagings..

117

Comparison with the Croton records of rainfall and runoff...

117

Yield of Sacandaga drainage area compared with Hudson river at

Mechanicville ....

118

Natural yield without storage in time of drought..

121

Daily gagings of Hudson river tributaries made for New York State

Water Supply Commission by the U. S. Geological Survey under

Chapter 569 of the Laws of 1907.

123

Schroon river near Riverbank P. O.

123

Sacandaga river at Wells...

125

Sacandaga river at Northville.

127

Sacandaga river at Hadley..

129

Hudson river at North Creek.

131

Hudson river at Thurman...

133

Confirmation of estimates of Hudson flow by rainfall studies...

137

Report by Prof. Francis J. Seery upon the several rain gage stations

in the Adirondack plateau...

137

Additional rain gage stations in Adirondacks..

137

Rain fall compilations cycles of wet and dry years.

142

Comparison of rain gages...

146

Larger runoff on the Sacandaga drainage area...

146

Yield of water power from the estimated flow from Sacandaga reservoir. 147

Increase of power at present Hudson river plants due to the discharge of

storage from the Sacandaga reservoir

147

Increase of Hudson river power from Sacandaga storage — (first stage).. 153

Increase of Hudson river power from Sacandaga storage — (second stage). 154

PAGE.

Scope of the Sacandaga surveys..

155

Proposed plan of Sacandaga works.

156

Borings at dam sites.

158

Proposed dam .

161

Estimates of cost and profit

163

Real profit on the investment

176

Studies on Genesee river.....

176

Inspection at request of city and county officials.

176

Use of reservoir for flood control — Advantage of State supervision.. 178

Stream flow measurements on upper Genesee.

180

Accuracy of Mount Morris gagings.

181

Storage requirements at Portage.

182

Proposed Portage reservoir

183

Study of more ancient rainfall records...

184

Quantity of water to be reserved for scenic effect in Glen Iris. 188

Increased power at present Genesee river plants (first stage)

193

Increased power at present Genesee river plants (second stage) 194

Flood control by Genesee storage reservoir....

195

Data from report of Rochester Flood Commission of 1905. 195

Conclusions regarding Genesee river floods.....

196

Higher dam and cheaper reservoir now proposed..

197

Plan of Portage works proposed...,

198

Yield of drainage area above Portage with storage.

199

Estimate of power.

200

Construction proposed for Portage dam...

201

Scenic interest along new railroad location.

202

Character of sub-strata at thin rim of Portage basin..

202

Report on Portage rim samples by W. 0. Crosby.

205

Report on Portage rim samples by W. E. Spear..

207

Report on Portage rim samples by James L. Davis.

208

Approximate estimate of cost of Portage reservoir.

209

Approximate estimate of cost of power plant..

212

Estimated cost per horse power of the Portage development. 215

Conclusion

216

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